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Description ( англиски )

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Varieties 5 (1 in the flora): North America, Mexico.
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Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
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Flora of North America Vol. 2 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
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Flora of North America @ eFloras.org
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Flora of North America Editorial Committee
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eFloras

Broad-scale Impacts of Fire ( англиски )

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More info for the term: wildfire

Alligator juniper mortality following an August wildfire in an oak-juniper woodlands of Arizona was estimated at 28% [67].

Temperatures lethal to alligator juniper tissue vary according to desiccation, and thus season of burn. Site characteristics also may contribute to the specific effects of fire. During a 2-year study, lethal temperatures ranged from 147 degrees Fahrenheit (63.8oC), which was recorded in summer, to 174 degrees Fahrenheit (80.0oC), which was observed during the late fall. Detailed data follow [59]:

These findings indicate greatest susceptibility to fire during dry, hot months. Annual variation is also probable.
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библиографски навод
Tirmenstein, D. 1999. Juniperus deppeana. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). Available: https://www.fs.fed.us/database/feis/plants/tree/jundep/all.html/
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Fire Effects Information System Plants

Common Names ( англиски )

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alligator juniper

checker-bark juniper
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библиографски навод
Tirmenstein, D. 1999. Juniperus deppeana. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). Available: https://www.fs.fed.us/database/feis/plants/tree/jundep/all.html/
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Cover Value ( англиски )

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More info for the terms: cover, shrub

Alligator juniper provides shade and shelter for many wildlife species and for domestic livestock [29]. Woodrats are known to use alligator juniper as support structures for nests [126]. A New Mexico study found that the percentage of shelters that white-throated woodrats constructed from alligator juniper was as follows [126]:

live trees 4.3
dead trees 2.2

The broad-tailed hummingbird, acorn woodpecker, ash-throated flycatcher, Mexican jay, black-crested titmouse, bushtit, blue-gray gnatcatcher, and rufous-crowned sparrow breed in pinyon-juniper habitats dominated by alligator juniper in the Chisos Mountains of Texas [132]. Alligator junipers provide nest sites for many bird species, and older trees may contain hollow cavities at the bases that are used by cavity nesters [93]. Alligator junipers provide hiding and thermal cover and migration corridors for a variety of animals. Young trees provide cover for elk, deer, and small mammals. This cover may be particularly important when deep snows make other food sources unavailable [98]. Miller and Wigand [93] report that mule deer often move from shrub communities to juniper woodlands during winter stress periods.
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cc-publicdomain
библиографски навод
Tirmenstein, D. 1999. Juniperus deppeana. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). Available: https://www.fs.fed.us/database/feis/plants/tree/jundep/all.html/
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Description ( англиски )

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More info for the term: tree

Alligator juniper is the largest southwestern juniper, but most commonly grows as a medium-sized evergreen tree that reaches 20 to 40 feet (6.1-12.2 m) at maturity [82,139]. It can attain heights of up to 65 feet (20 m) and maximum diameters of 7 feet (2.1 m) [69, 85]. A single short but heavy massive trunk is more typical than multiple stems [10,103]. Alligator juniper has a "dense and spreading canopy of deep green foliage" [103]. The plant receives its name from the thick, checkered, furrowed bark which is divided into scales resembling the back of an alligator [62,103,139]. Mature alligator junipers often have a large portion of dead wood intermixed with living wood. Chojnacky [23] estimated dead wood at less than 15% total volume in alligator juniper.

Cones generally contain 3 to 5 seeds [125]. The hard, mealy "berries," which mature during the second year, are approximately ? inch (1.3 cm) in diameter [82].

Alligator juniper is noted for its slow growth rate. It ceases growth when moisture conditions are unfavorable but begins growing again with adequate moisture [54]. This characteristic greatly enhances the ability of alligator juniper to survive in harsh, arid environments. A diameter growth rate of approximately 0.6 inch (1.5 cm) per decade is typical for young trees, with growth slowing to 0.4 inch (0.1 cm) per decade after the tree reaches 170 years of age [90]. Maximum longevity is reported at 500 years [85].

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библиографски навод
Tirmenstein, D. 1999. Juniperus deppeana. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). Available: https://www.fs.fed.us/database/feis/plants/tree/jundep/all.html/
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Distribution ( англиски )

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Alligator juniper occurs from western Texas to northwestern New Mexico and reaches its northern limit in north-central Arizona near Flagstaff. It extends southward into northern and central Mexico where it is described as "widespread" [37,79,80,82,84,125]. Distribution of varieties is as follows [138]:

Juniperus deppeana var. deppeana Sierra Madre Oriental in the state of Mexico north to Coahuila J. d. var. robusta Sierra Madre Occidental in the states of Zacatecas, Durango and Chihuahua J. d. var. zacatecensis western Mexico and adjacent Durango
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cc-publicdomain
библиографски навод
Tirmenstein, D. 1999. Juniperus deppeana. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). Available: https://www.fs.fed.us/database/feis/plants/tree/jundep/all.html/
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Fire Ecology ( англиски )

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More info for the terms: fire suppression, root crown

Although exact fire histories are difficult to determine, evidence suggests that fire was common in pinyon-juniper communities before European-American settlement [21]. It is thought that in presettlement times, lower elevation woodlands of southeastern Arizona were relatively open with a fire-maintained dense grass understory [8]. The role of fire in Madrean ecosystems, in which alligator juniper occurs as an important component, is largely unknown [13,77]. It is suspected that fires usually occurred here during the annual dry period from May through late July [77]. Most research indicates that fire-free intervals have increased in pinyon-juniper communities, leading to downslope juniper invasion of grasslands and shrublands in parts of the Great Basin, Arizona, and Texas [37]. Reductions in fine fuels by grazing and active fire suppression are often cited as probable reasons for longer fire-free intervals [21,37,40].

Alligator juniper canopies are often high enough so that fires scorch but do not severely damage the crown [74]. The bark also provides protection from fire. Kittams [74] reports that alligator juniper bark is seldom burned by fires in Chihuahuan Desert communities.

Alligator juniper is generally capable of prolific sprouting after aboveground vegetation is consumed by fire, particularly if the "resprouting zone" is covered by soil. By sprouting, alligator juniper may survive fires of even high intensity [107,135] and quickly regains dominance on most sites [67,107,135,121]. Mortality of even small trees generally appears to be low [67]. Alligator junipers typically sprout from the root crown following fire [133]. Susceptibility to fire may also be greater during drought years [121].

The range of fire intervals reported for some species that dominate communities where alligator juniper occurs are listed below. To learn more about the FIRE REGIMES in those communities refer to the FEIS summary for that species, under "Fire Ecology or Adaptations."

Rocky Mountain ponderosa pine (Pinus ponderosa var. scopulorum): 2 to 40 years
Mexican pinyon (P. cembroides): 20 to 70 years
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библиографски навод
Tirmenstein, D. 1999. Juniperus deppeana. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). Available: https://www.fs.fed.us/database/feis/plants/tree/jundep/all.html/
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Fire Management Considerations ( англиски )

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More info for the terms: cover, density, forb, fuel, fuel loading, fuel moisture, herb, herbaceous, prescribed fire, shrubs, tree

Prescribed fire is commonly used to reduce juniper dominance. Management objectives include controlling juniper and shrubs, increasing forb production, enhancing habitat diversity, increasing herbivore diversity, enhancing nutritive quality and palatability of forage, and preparing sites for reseeding. On some sites, substantial control of trees by fire may last for up to 50 years, with linear reductions in herbaceous cover as the overstory develops. Where pinyon-juniper cover exceeds 20%, increases in herbaceous plant growth after fire may be low, but where the canopy cover is less, perennial grasses may respond quickly. On sites with high tree cover, however, annuals may quickly invade and can prevent the establishment of a perennial herb community [21]. Alligator juniper may be eliminated in ponderosa pine forests in which underburns occur at 3 to 7 year intervals [71].

Prescribed fire may not be an effective management tool where pinyon-juniper is in an advanced successional state or on sites dominated by exotic annuals. If desirable perennials fail to establish, the site can be left open and susceptible to weed invasion or soil erosion. Fine fuel loading is critical when planning burns in pinyon-juniper woodlands. Sites with < 600 kg/ha fine fuels will be difficult to burn with the intensity needed to scorch and kill alligator juniper [21]. The following methods have been used in attempts to reduce alligator juniper on Arizona rangeland:

1) broadcast burning
2) burning individual trees
3) burning grasslands to kill junipers less than 3 ft (0.9 m) in height
4) burning scattered, wind-rowed, or piled pinyon-juniper slash after mechanical treatment

None of these methods has been entirely satisfactory. Broadcast burning in these communities requires a density of 200 to 400 trees per acre, air temperatures around 85 to 90 degrees Fahrenheit (29-35oC), relative humidity of 4 to 8%, and an average wind speed of 10 to 20 mph (16-32 km/h) [107]. Burning individual trees is both costly and labor intensive, and relatively ineffective for sprouters such as alligator juniper [61,107,120]. Blackburn and Bruner [15] have recorded 40% mortality following individual burning of alligator juniper.

When mechanical treatment is combined with fire, two-way chaining tends to windrow the slash, producing a better burn which kills more small trees [107].

To increase habitat diversity, several small burns ( less than 20 ha) may be more effective than a single large burn. Disadvantages include increased cost and greater likelihood of damage by grazing. Bunting [21] reports an optimum burn size of approximately 500 to 2,500 acres (200-1000 ha) where hand-firing techniques are to be used, and larger areas where aerial ignition is planned. Where fuel loading is irregular, smaller areas within a larger burn unit can be ignited under conditions of lower temperature and higher fuel moisture, but this often leaves larger amounts of the unit unburned.

It is difficult to date fire scars of alligator juniper. It may stop growing when soil moisture is unavailable and resume growth when soil moisture conditions improve. This growth pattern produces "false rings," and makes counting rings extremely difficult [50,97].

Because strips of bark tend to remain on alligator juniper for many years after fire, early utilization of fire-killed trees may be somewhat limited. The use of chemical debarking agents may allow for better immediate utilization of the wood [10].

Palatability of alligator juniper foliage is enhanced by fire [74]. Young shoots may be particularly palatable to herbivores.
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библиографски навод
Tirmenstein, D. 1999. Juniperus deppeana. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). Available: https://www.fs.fed.us/database/feis/plants/tree/jundep/all.html/
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Growth Form (according to Raunkiær Life-form classification) ( англиски )

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More info on this topic.

More info for the term: phanerophyte

Phanerophyte
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библиографски навод
Tirmenstein, D. 1999. Juniperus deppeana. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). Available: https://www.fs.fed.us/database/feis/plants/tree/jundep/all.html/
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Habitat characteristics ( англиски )

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More info for the term: forest

Alligator juniper grows in semi-arid to subhumid montane "island" ecosystems in the Chihuahuan Desert and adjacent dry areas [37] as a subdominant in ponderosa pine forests of New Mexico, in riparian forest and riparian woodlands of Arizona [18,33]. Annual precipitation in pinyon-juniper ranges from 12 to 22 inches (305-559 mm) [49]. Alligator juniper is well adapted to survive short-term droughts, but mortality can occur after more than 6 years of drought [37]. Alligator juniper soils are variable but tend to be shallow, rocky and of low fertility [86]. Clay content averages approximately 18 to 27%. Some researchers report that alligator juniper favors soils which are slightly to moderately alkaline [81].

Alligator juniper most commonly grows between 4,000 and 6,000 ft (1,220-1,830 m) [30]. Elevational ranges of alligator juniper are as follows [46,82,86]:

     4,426 to 7,915 ft (1,350-2,414 m) from AZ to NM
     5,100 to 6,000 ft (1,556-1,830 m) from NM to TX

лиценца
cc-publicdomain
библиографски навод
Tirmenstein, D. 1999. Juniperus deppeana. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). Available: https://www.fs.fed.us/database/feis/plants/tree/jundep/all.html/
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Habitat: Cover Types ( англиски )

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More info on this topic.

This species is known to occur in association with the following cover types (as classified by the Society of American Foresters):

237 Interior ponderosa pine

239 Pinyon-juniper

240 Arizona cypress

241 Western live oak



лиценца
cc-publicdomain
библиографски навод
Tirmenstein, D. 1999. Juniperus deppeana. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). Available: https://www.fs.fed.us/database/feis/plants/tree/jundep/all.html/
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Habitat: Ecosystem ( англиски )

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More info on this topic.

This species is known to occur in the following ecosystem types (as named by the U.S. Forest Service in their Forest and Range Ecosystem [FRES] Type classification):

More info for the term: shrub

FRES21 Ponderosa pine

FRES28 Western hardwoods

FRES29 Sagebrush

FRES32 Texas savanna

FRES34 Chaparral-mountain shrub

FRES35 Pinyon-juniper

FRES36 Mountain grasslands

FRES37 Mountain meadows



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библиографски навод
Tirmenstein, D. 1999. Juniperus deppeana. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). Available: https://www.fs.fed.us/database/feis/plants/tree/jundep/all.html/
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Habitat: Plant Associations ( англиски )

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More info on this topic.

This species is known to occur in association with the following plant community types (as classified by Küchler 1964):

More info for the terms: forest, woodland

K011 Western ponderosa forest

K023 Juniper-pinyon woodland

K031 Oak-juniper woodlands



лиценца
cc-publicdomain
библиографски навод
Tirmenstein, D. 1999. Juniperus deppeana. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). Available: https://www.fs.fed.us/database/feis/plants/tree/jundep/all.html/
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Habitat: Rangeland Cover Types ( англиски )

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More info on this topic.

This species is known to occur in association with the following Rangeland Cover Types (as classified by the Society for Range Management, SRM):

More info for the terms: association, woodland

503 Arizona chaparral

504 Juniper-pinyon pine woodland

509 Transition between oak-juniper woodland and mahogany-oak association

733 Juniper-oak



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библиографски навод
Tirmenstein, D. 1999. Juniperus deppeana. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). Available: https://www.fs.fed.us/database/feis/plants/tree/jundep/all.html/
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Immediate Effect of Fire ( англиски )

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More info for the terms: severity, tree, wildfire

Alligator juniper appears resistant to the effects of fire [12,74,133]. Consequently mortality of alligator juniper is generally low, even after fires of relatively high severity [107]. The probability of mortality may depend at least in part, on the size of the tree. In many instances the smallest alligator junipers appear to be most susceptible to fire-caused mortality [67]. As many as 32% of alligator junipers < 3 inches (7.6 cm) in dbh were killed after a hot June wildfire in southeastern Arizona [16]. Trees with a dbh of 31 inches (79 cm) or more do not resprout and may be killed by fire. Following a hot June fire in northern Sonora and southeastern Arizona, many of the large alligator junipers suffered severe damage and subsequently died [43]. However, large alligator junipers are not always killed by fire. Researchers have observed fire scars on old alligator junipers which indicate these large trees have survived many surface fires [34,97]. Kittams [74] reports that alligator juniper bark is seldom burned by fires in the Chihuahuan Desert. Irregular strips of the fibrous bark tend to remain attached to the alligator juniper for many years after the plants have been killed by fire [10].
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библиографски навод
Tirmenstein, D. 1999. Juniperus deppeana. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). Available: https://www.fs.fed.us/database/feis/plants/tree/jundep/all.html/
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Importance to Livestock and Wildlife ( англиски )

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More info for the terms: association, cone, seed, tree

Alligator juniper is an important component of the southern portion of pinyon-juniper woodlands. This association provides good quality habitat for numerous species including mule deer, bighorn sheep, pronghorn, wild horse, coyote, bobcat, badger, porcupine, rabbits, mice, voles, woodrats, squirrels, and many species of birds [41]. Alligator juniper provides shade and shelter for wildlife and livestock. Pinyon-juniper woodlands provide valuable winter and, in some instances, year-round range for elk, deer, and livestock in parts of Arizona and New Mexico [112]. Both mule deer and white-tailed deer use alligator juniper stands in parts of southeastern Arizona [5]. At least 73 species of birds are known to breed in pinyon-juniper, and 32 species overwinter in these woodlands [56].

The berry-like cones of alligator juniper remain on the tree for a considerable length of time and, when abundant, provide a rich and readily available food source for many birds and mammals [6,41]. Cone-berries of junipers are often available at a time of year when other food sources are scarce [56]. Some researchers report that bird densities in pinyon-juniper woodlands may be up to 70% greater during bumper cone years than in average years [9]. Both birds and mammals are capable of consuming large quantities of juniper cone-berries and are extremely important dispersal agents [6]. Cone-berries provide food for coyotes during the summer, fall, and winter; they assume particular importance during the fall [105]. In some areas, both deer and elk eat juniper cone-berries during the winter months [119]. Alligator juniper is also an important food source for the collared peccary in parts of New Mexico [19].

Alligator juniper cone-berries are believed to be an important component in winter wild turkey diets in north-central Arizona [131]. "Cone-berries may be particularly important to wild turkeys during drought years [50]. In New Mexico, an endangered subspecies of wild turkey, the Gold's turkey, feeds on alligator juniper [102]. The prevalence of juniper cone-berries may determine the densities of overwintering birds such as the Townsend's solitaire, western and mountain bluebirds, and the American robin [50]. Some avian species consume both the pulpy flesh and seeds of juniper cone-berries (Cassin's finch, evening grosbeak); others, which are more important dispersal agents, digest only the pulp and disperse the seed (bluebirds, American robin, and Townsend's solitaire) [56].

The foliage of alligator juniper is apparently somewhat more palatable than the foliage of most other junipers [32] and, consequently, is more often utilized as browse. Research indicates that the mean volatile oil content of alligator juniper is less than that of either Rocky Mountain or Utah juniper. Foliage is also believed to have less of an inhibitory effect on bacterial rumen of deer [116]. Alligator juniper is reported to be an important year-round mule deer food in parts of New Mexico [88]; in southeastern New Mexico, it is considered a major food item from January through March [113]. In parts of south-central New Mexico, it is a common although not preferred item in mule deer diets [87]. In the Dos Cabezos Mountains of southeastern Arizona, alligator juniper is reported to be one of the seven most important foods of both mule deer and white-tailed deer. Although important to both species, it was eaten nearly twice as often by mule deer [5]. The foliage of alligator juniper frequently represents a major item in elk diets in Arizona ponderosa pine stands [28]. It has little forage value for most livestock but is sometimes eaten by domestic goats [32,75].
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библиографски навод
Tirmenstein, D. 1999. Juniperus deppeana. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). Available: https://www.fs.fed.us/database/feis/plants/tree/jundep/all.html/
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Key Plant Community Associations ( англиски )

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More info for the terms: forest, formation, habitat type, shrub, tree, woodland

Alligator juniper occurs in pinyon-juniper (Pinus-Juniperus spp.), pine-oak (Pinus-Quercus spp.), juniper-oak, Madrean evergreen, and riparian woodlands, and in ponderosa pine (P. ponderosa) forest. It rarely grows in dense stands. Typically, it occurs in small groves or as individuals interspersed with other junipers, ponderosa pine, oaks, or various understory species [6,86,103]. Alligator juniper is a common component of pinyon-juniper woodlands with pinyon (P. edulis) and/or singleleaf pinyon (P. monophylla). It occurs at somewhat higher elevations than oneseed or Utah juniper [26,72,86]. Pinyon-juniper woodlands make up more than one half of New Mexico's forested lands, and alligator juniper represents approximately 7% of all trees within that area [24].


Alligator juniper also occurs in pine-oak woodlands of Arizona. Along with Mexican pinyon (P. cembroides) [31], it is an important constituent of juniper-oak woodlands of the Colorado Plateau [139]. In parts of southern Arizona and Mexico, it occurs in Madrean evergreen woodlands with various oaks and pines and in lower elevation, pygmy conifer-oak woodlands [10,84,122,126,]. These woodlands are characterized by having less oneseed juniper, Rocky Mountain juniper, and pinyon, but greater amounts of alligator juniper, Emory oak (Q. emoryi), gray oak (Q. grisea), Arizona white oak (Q. arizonica), and Mexican pinyon [20].



Tree species commonly codominating with alligator juniper include pinyon, oneseed juniper, ponderosa pine, and gray oak. Common shrub associates include skunkbush sumac (Rhus trilobata), true mountain-mahogany (Cercocarpus montanus), desert ceanothus (Ceanothus greggii), pointleaf manzanita (Arctostaphylos pungens), Apache plume (Fallugia paradoxa), and Parry agave (Agave parryi). Blue grama (Bouteloua gracilis), sideoats grama (B. curtipendula), vine-mesquite (Panicum obtusum), wolftail (Lycurus phleoides), bottlebrush squirreltail (Elymus elymoides), mountain muhly (Muhlenbergia montana), pine muhly (M. dubia), and bullgrass (M. emersleyi) are frequent grass associates of alligator juniper [11,73,96,109].


Alligator juniper is named as a dominant or indicator species in several pinyon-juniper and montane forest vegetation classifications. Publications describing plant communities dominated by alligator juniper are listed below.



Forest and woodland habitat types (plant associations) of Arizona south of the Mogollon Rim and southwestern New Mexico [11]

Ecology and diversity of pinon-juniper woodland in New Mexico [33]

A vegetation classification system for New Mexico, USA [36]

Ecology and classification of the pinyon-juniper woodlands in western New Mexico [55]

Plant associations of Region Two: Potential plant communities of Wyoming, South Dakota, Nebraska, Colorado, and Kansas [68]

Woodland classification: the pinyon-juniper formation [69]

A habitat type classification of the pinyon-juniper woodlands of the Lincoln National Forest, New Mexico [73]

Woodland communities and soils of Fort Bayard, southwestern New Mexico [90]

Classification of pinyon-juniper (P-J) sites on National Forests in the Southwest [96]

Spatial variation of pinon-juniper woodlands in New Mexico [109]

Plant associations (habitat types) of the forests and woodlands of Arizona and New Mexico [123]
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библиографски навод
Tirmenstein, D. 1999. Juniperus deppeana. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). Available: https://www.fs.fed.us/database/feis/plants/tree/jundep/all.html/
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Life Form ( англиски )

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More info for the term: tree

tree
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Tirmenstein, D. 1999. Juniperus deppeana. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). Available: https://www.fs.fed.us/database/feis/plants/tree/jundep/all.html/
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Management considerations ( англиски )

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More info for the terms: cool-season, cover, density, fire frequency, frequency, root crown

Pinyon-juniper woodlands have been increasing in extent since settlement times. In many parts of the Southwest, alligator juniper and other species have encroached into adjacent grasslands [60,99,134]. A decrease in fire frequency has often been cited as the probable cause of this increase [133]. However, overgrazing offers another possible explanation. Past management efforts have largely focused on halting the juniper "invasion" through mechanical or chemical means. Little regard was given to possible wildlife use of these areas or to potential wood products value of juniper species. In a number of instances, juniper removal alone does little to increase long-term forage potential. Miller and Wigand [93] note that although juniper is largely accepted as providing beneficial wildlife habitat, there is significant disagreement as to how much juniper is optimal, the acceptable size of treated areas, the effect of thinning as opposed to total juniper removal, and whether particular sites should or should not be treated.



Several types of mechanical treatments have been used with varying success in converting pinyon-juniper woodlands to grasslands. Cabling, chaining, bulldozing, and other mechanical means of removal are most effective in eliminating mature, even-aged, nonsprouting junipers in stands of approximately 250 trees or less per acre. Elimination of alligator juniper is often difficult however, because of its proclivity to sprout following disturbance. Even repeated defoliation may be ineffective [65]. Brush choppers, hand-cutting, and rottocutters also appear to be relatively ineffective for killing alligator juniper [120]. According to Jameson and Johnsen [62], the root crown must be removed for good results to be obtained through mechanical control. Severson [117] reported little difference between treated and untreated plots in New Mexico 13 to 18 years after mechanical removal. No significant differences were detected between untreated and thinned plots or between pushed/left and pushed/piled/burned plots, although significant (p less than 0.05) differences were observed between bulldozed and untreated/thinned treatments. Density (stems/ha) of alligator juniper on four treatments in 1983 was as follows [117]:


untreated
thinned
pushed/left
pushed/piled/burned

85
38
5
3




Research results suggest that the rate and intensity of sprouting may be related to both the size of stem and the season of disturbance. Sprouting is most frequently noted in the smaller size classes. Researchers in Arizona observed that when alligator junipers less than 4 inches (10 cm) in diameter were cut, 90% sprouted within 2 years. Sprouting was less common in larger trees, and generally only multi-stemmed alligator junipers with stumps greater than 12 inches (31 cm) in diameter resprouted. Researchers also observed that trees cut in October and June sprouted at a slower rate than did those cut in August, January, and April. Sprouts from trees cut in October and June averaged 12 inches (31 cm) by the following August, whereas those cut in other months averaged approximately 19 inches (48 cm) in length. Approximately 28% of alligator junipers cut to 4 feet (1.2 m) stumps in August, 1957, sprouted by September of the following year with an average length of 1.6 feet (0.5 m) [62].



Herbicide application is frequently combined with mechanical removal to increase alligator juniper mortality [63]. In some instances, basal sprouts from mechanically treated trees can be killed by herbicides. Junipers can reportedly be killed by such chemicals as arsenite, ammonium sulfate, esters of 2,4-D and 2,4,5-T, and polychlorobenzoic acid [120]. Variable results have been obtained with picloram or tebuthiuron [65]. Specific research has been conducted on application of various herbicides on alligator juniper [27,62,65,92].



Site characteristics can influence the effectiveness of herbicides on alligator juniper. Herbicides more often kill junipers on ridges and slopes than on bottomlands [65]. Frequently, trees on deeper soils remain undamaged after herbicide application [65]. Slope, rooting depth, and density of the top growth can all greatly influence the effectiveness of herbicide treatments [63].



Many pinyon-juniper ranges in which alligator juniper is well represented are now in relatively poor condition. Humphrey [57] reports that blue grama, sideoats grama, Stansbury cliffrose (Purshia mexicana var. stansburiana), silktassel (Garrya spp.), and Indian ricegrass (Achnatherum hymenoides) occur commonly on alligator juniper ranges of Arizona in good condition, with the cover of such species as bottlebrush squirreltail, goldeneye (Viguiera spp.), birdbeak (Cordylanthus parviflorus), and broom snakeweed (Gutierrezia sarothrae) increasing with overgrazing. The following species are indicative of range condition on some Arizona alligator juniper sites [57,58]:



excellent:
black grama (Bouteloua eriopoda), Indian ricegrass, blue grama, winterfat (Krascheninnikovia lanata), Stansbury cliffrose, and fourwing saltbush (Atriplex canescens)



good:
Indian ricegrass, black grama, blue grama, needlegrass (Stipa spp.), and spike muhly (Muhlenbergia wrightii)



fair:
blue grama



poor:
broom snakeweed, ringgrass (Muhlenbergia torreyi)



Somewhat variable results have been obtained following alligator juniper removal aimed at returning woodlands to grasslands to increase forage production. In some Arizona alligator juniper savannas, early grass production is as much as 4 to 5 times greater under the crowns of junipers than in the interspaces. Forage species such as mutton bluegrass (Poa fendleriana), bottlebrush squirreltail, prairie junegrass (Koeleria macrantha), and western wheatgrass (Pascopyrum smithii) particularly benefit from the shade of large alligator junipers. Researchers report that nearly all livestock utilization occurs under the crown of large alligator junipers in these savannas. In many cases the removal of large alligator junipers results in the elimination of readily utilizable cool-season forage and produces only a small increase in warm season forage. Since these areas are most often used as spring-fall ranges, results are usually not beneficial to livestock [29].



Clary [25] reports somewhat better results following treatment of north-central Arizona juniper sites. Here the removal of 13% of the alligator juniper produced a 38% increase in total herbage production and a 45% increase in forage plant production. Untreated areas produced approximately 635 pounds of herbage per acre and 292 pounds of forage per acre, whereas the treated sites produced 877 pounds of herbage per acre and 423 pounds of forage per acre. Much of the increased production was in bottlebrush squirreltail or western ragweed (Ambrosia psilostachya). Generally, production and grazing opportunities reach a peak within a year or two after treatment. Overall, herbage production is variable in alligator juniper communities.



Juniper is characterized by a slow growth rate and rotations on "typical" pinyon-juniper sites are thought to average around 200 years. Rotations of 300 years are more usual on poor sites [91]. A modified simulated shelterwood cut can be used where advance regeneration is adequate, but clear-cuts and seed-tree cuts generally give unsatisfactory regeneration. Two and three cut shelterwood cuts are being evaluated [48]. The coppice method can be considered where maintaining alligator juniper is a goal [38].
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Tirmenstein, D. 1999. Juniperus deppeana. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). Available: https://www.fs.fed.us/database/feis/plants/tree/jundep/all.html/
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Nutritional Value ( англиски )

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Little specific information exists on the food value of alligator juniper. The cone-berries apparently provide at least moderate energy for a number of bird species [9]. Researchers have estimated the average energy value of a juniper cone-berry at 315.31 calories [114].




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Tirmenstein, D. 1999. Juniperus deppeana. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). Available: https://www.fs.fed.us/database/feis/plants/tree/jundep/all.html/
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Occurrence in North America ( англиски )

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AZ   CO   NM   TX   MEXICO





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Tirmenstein, D. 1999. Juniperus deppeana. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). Available: https://www.fs.fed.us/database/feis/plants/tree/jundep/all.html/
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Other uses and values ( англиски )

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More info for the term: fuel

Wood of alligator juniper was formerly made into charcoal in parts of the Southwest [6]. During historic times the wood of many species of juniper was used as fenceposts, poles, mine timbers, fuel for the mining industry, and railroad ties [8,10,41]. Springfield [120] notes that juniper wood may have potential for use in making charcoal and for producing certain chemicals. Wood extractives of alligator juniper may be of value although the precise characteristics of the extractives of this species are poorly known. Extractives from morphologically similar species are used in making pharmaceuticals, perfumes, polishes, and insecticides [10].

Juniper wood is associated with traditional values in a number of Native American cultures. The wood has traditionally been used in construction of pueblos and hogans, and for making corrals and fences [94]. The cone-berries of alligator juniper were used in traditional foods, medicines, teas, and in ceremonial incense [30,94,95]. The Zuni used alligator juniper cone-berries to flavor foods such as cornbread and blood sausage. They used the shreddy bark to make torches [95].
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Tirmenstein, D. 1999. Juniperus deppeana. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). Available: https://www.fs.fed.us/database/feis/plants/tree/jundep/all.html/
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Palatability ( англиски )

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The foliage of alligator juniper relatively unpalatable to livestock and most wild ungulates. Palatability of alligator juniper for mule deer has been reported as follows [76,100]:


winter - high to low

spring - moderate to low

summer - moderate to low

fall - high





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Tirmenstein, D. 1999. Juniperus deppeana. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). Available: https://www.fs.fed.us/database/feis/plants/tree/jundep/all.html/
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Phenology ( англиски )

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More info for the terms: formation, seed

Alligator juniper begins annual leader elongation in the early spring when soil temperatures warm to approximately 50 degrees Fahrenheit (10oC) [54]. Phenological development in Arizona was as follows:

Phenological stage                                      Date

bark begins to slip                                       April 1
pollen shedding and female cones open      April 8
approximate start of leader elongation        April 20
1st conspicuous formation of male cones   August 19
bark begins to stick                                    September 15
leader elongation ceases                             October 19

Throughout its range, alligator juniper flowers from February through March [66,86]. Lymbery and Pieper [86] report the following phenological sequence in the Sacramento Mountains of New Mexico:

Year          Month                        Stage of development

1               February-March          cones open; pollen disperses
2               August-October          cones mature; seed disperses

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Tirmenstein, D. 1999. Juniperus deppeana. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). Available: https://www.fs.fed.us/database/feis/plants/tree/jundep/all.html/
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Plant Response to Fire ( англиски )

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Alligator juniper is capable of prolific sprouting after aboveground vegetation is consumed or damaged by fire [67,107]. Basal sprouts have been observed on trees as young as 1 year [62]. Sprouts generally grow rapidly with favorable weather conditions [133]. Alligator juniper can quickly regain dominance after fire on Arizona rangelands [107]. Approximately 42% of all living alligator junipers sprouted from the base after an August wildfire in oak-juniper woodlands of Arizona [16].
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Tirmenstein, D. 1999. Juniperus deppeana. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). Available: https://www.fs.fed.us/database/feis/plants/tree/jundep/all.html/
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Post-fire Regeneration ( англиски )

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More info for the terms: adventitious, fire regime, ground residual colonizer, root sucker, secondary colonizer, seed

Tree with adventitious bud/root crown/soboliferous species root sucker
Ground residual colonizer (on-site, initial community)
Secondary colonizer - off-site seed

FIRE REGIMES: Find fire regime information for the plant communities in which this species may occur by entering the species name in the FEIS home page under "Find FIRE REGIMES".

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Tirmenstein, D. 1999. Juniperus deppeana. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). Available: https://www.fs.fed.us/database/feis/plants/tree/jundep/all.html/
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Regeneration Processes ( англиски )

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More info for the terms: cone, monoecious, root crown, seed, shrubs, stratification

Alligator juniper is monoecious. Cones open during February or March and mature from August to October of their second year [66]. Cone crop production exhibits significant annual variation [91].

Juniper seeds have low germination rates due to impermeable to semipermeable, thick, hard seedcoats, chemical inhibitors, and dormant embryos [56,64,106]. Juniper seeds remain dormant in the soil until favorable moisture conditions promote germination [64]. "Major episodes" of alligator juniper establishment can occur during wet years [37]. Germination varies from 16 to 45%, with an average of 16% of alligator juniper seeds retaining viability after 9 years [6,64,66,125]. Approximately 30% of all alligator juniper seed stored in a warehouse for 5 years germinated [64]. Two to 3 years may be required for germination [30]. Pack [106] found that high temperatures, alternating temperatures, repeated freezing and thawing, removal of the seedcoat, and application of hydrogen peroxide, dilute acids, carbon dioxide, or light had little influence on the germination of juniper seeds. Johnsen and Alexander [66] note that the most common treatment for alligator juniper seed involves cold stratification at 41 degrees Fahrenheit (5oC) for a period of 30 to 120 days.

Shrubs and trees often moderate harsh environmental conditions so juniper seedlings are commonly found beneath a canopy [56]. Animal dispersal is known to be extremely important in alligator juniper. Up to 95% of juniper reproduction may be attributed to birds on harsh New Mexico sites [44,108]. Digestive processes may encourage germination [9,39]. Juniper seed is dispersed by gravity, run-off, birds, or mammals including coyote, bighorn sheep, mice, rabbits, and livestock [19, 99,122]. Birds such as Bohemian waxwing, American robin, wild turkey, and jays disperse juniper seed. Brightly colored alligator juniper "berries" can be seen by birds at some distance and large quantities of this readily available food source may be consumed [9,41].

Alligator juniper is noted for its prolific sprouting ability [62]. This species is capable of sprouting from shallow roots, the root crown, or epicormic buds located along the branches or trunk [22,47,50,86,133]. Alligator juniper generally sprouts prolifically from dormant basal, root, or stem buds whenever the top is damaged, and consequently is not significantly reduced by most mechanical treatments. Sprouting often occurs after removal or death of the main trunk. Research indicates that younger trees sprout more readily than older plants [6] and that sprouting ability declines as stump diameters increases [47]. Alligator junipers 2 feet (0.6 m) or larger in diameter rarely sprout [6]. Jameson and Johnsen [62] report the following sprouting by stump diameter:

trees with sprouts stump diameter (in.) # trees observed # % 1-6 156 140 90 7-12 27 18 67 13-30 37 22 59 31-48 2 0 0
Stumps larger than 12 inches (31 cm) in diameter generally produce sprouts only from multi-stemmed trees. Trees as young as 1 year in age may produce basal sprouts. Dormant buds typically begin growth soon after the top of the plant is damaged, but growth of dormant buds is often limited when side branches are damaged. Sprouts derived from the root crown are most common [62].
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Tirmenstein, D. 1999. Juniperus deppeana. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). Available: https://www.fs.fed.us/database/feis/plants/tree/jundep/all.html/
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Regional Distribution in the Western United States ( англиски )

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This species can be found in the following regions of the western United States (according to the Bureau of Land Management classification of Physiographic Regions of the western United States):

 7 Lower Basin and Range

12 Colorado Plateau

13 Rocky Mountain Piedmont



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Tirmenstein, D. 1999. Juniperus deppeana. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). Available: https://www.fs.fed.us/database/feis/plants/tree/jundep/all.html/
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Successional Status ( англиски )

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More info for the terms: climax, codominant, forest, habitat type, shrub, succession, tree

Succession and stand dynamics are poorly documented in evergreen woodlands in which alligator juniper occurs[77]. Pieper and others [110] note that "successional patterns where alligator juniper is a major potential component of the vegetation have not been determined." Climax alligator juniper stands have been reported on ridges and canyon rims [51]. In southwestern New Mexico, alligator juniper is considered a "minor climax species" [90]. However, this species has been included as a codominant indicator of climax vegetation in several habitat type classifications [73]. A generalized successional pathway for pinyon-juniper communities after fire has been described as follows [56]:

community description postfire year skeletal forest & bare soil 0 annuals 2 perennial grass/forb 4 shrub 25 shrub/open tree 100 climax pinyon-juniper 300
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Tirmenstein, D. 1999. Juniperus deppeana. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). Available: https://www.fs.fed.us/database/feis/plants/tree/jundep/all.html/
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Taxonomy ( англиски )

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The currently accepted scientific name of alligator juniper is Juniperus deppeana Steud. (Cupressaceae) [70,72,84,129,137]. Varieties and forms of alligator juniper include [1,2,136]:



Juniperus deppeana var. deppeana
Juniperus deppeana var. pachyphloea (Torr.) Martinez

Juniperus deppeana var. patoniana (Martinez) T.A. Zanoni

Juniperus deppeana var. robusta Martinez

Juniperus deppeana var. zacatecensis Martinez



These varieties differ with respect to geographic distribution, bark and leaf morphology, and in the composition of volatile oils [1,2,3,136].



Alligator juniper hybridizes with oneseed juniper (J. monosperma) from central Mexico through the Southwest to southern Colorado [53,79]. Redberry juniper (J. pinchotii) is a stabilized hybrid of alligator juniper and oneseed juniper [89,129]. Alligator juniper also hybridizes with Rocky Mountain juniper (J. scopulorum) [53,54,124].

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Tirmenstein, D. 1999. Juniperus deppeana. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). Available: https://www.fs.fed.us/database/feis/plants/tree/jundep/all.html/
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Value for rehabilitation of disturbed sites ( англиски )

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More info for the term: seed

Alligator juniper aids in preventing erosion on harsh sites [30]. It can be successfully propagated by seed [7].
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Tirmenstein, D. 1999. Juniperus deppeana. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). Available: https://www.fs.fed.us/database/feis/plants/tree/jundep/all.html/
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Wood Products Value ( англиски )

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More info for the terms: density, woodland

Wood of alligator juniper currently has little commercial value. Springfield [120] suggests the wood may have potential for producing pulp, fiber, chip products, and particleboard. Veneer has been made out of alligator juniper on an experimental basis, but large trees are too few and scattered in most locations to make this venture economically feasible [6,103]. Volume estimates from upper woodland zones of Arizona range from 100 to 250 feet3/acre and average 150 feet3/acre. At lower elevations volume averages only 109 feet3/acre [10].

Alligator juniper can be made into particleboard and is occasionally milled as lumber. The wood is also used to make furniture. It is most commonly used to make various novelty products such as bookends, lamp bases, or small chests. Alligator juniper wood is fragrant with an attractive color and grain [10].

Alligator juniper makes excellent firewood of relatively high heat value [103]. The wood is light, easy to split, and burns with a pleasant aroma [115]. It provides an estimated 243,000 BTUs/foot3. Weight (lbs) per standard cord has been measured as follows [10]:
oven-dry air-dry green 2,264 2,536 3,736 Specific properties of alligator juniper wood are as follows [10]:

density - 40 lbs/ft3
modulus of elasticity - 272,000 lbs/in3
strength: modulus of rupture - 3.430 lbs/in3
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Tirmenstein, D. 1999. Juniperus deppeana. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). Available: https://www.fs.fed.us/database/feis/plants/tree/jundep/all.html/
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Physical Description ( англиски )

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Tree, Evergreen, Dioecious, Habit erect, Trees without or rarely having knees, Tree with bark shaggy or peeling, Young shoots in flat sprays, Young shoots 3-dimensional, Buds not resinous, Leaves scale-like, Whip leaves present, Leaves of two kinds, Leaves opposite, Leaves whorled, Non-needle-like leaf margins entire, Leaf apex acute, Leaf apex mucronulate, Leaves < 5 cm long, Leaves < 10 cm long, Leaves not blue-green, Scale leaves without raised glands, Scale leaf glands not ruptured, Scales leaves not or barely overlapping, Whip leaf margins entire under magnification, Twigs glabrous, Twigs not viscid, Twigs without peg-like projections or large fascicles after needles fall, Berry-like cones dark blue, Berry-like cones pink, Bracts of seed cone included, Seeds tan, Seeds brown, Seeds wingless.
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Qalınqabıq ardıc ( азерски )

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Qalınqabıq ardıc (lat. Juniperus deppeana) — sərvkimilər fəsiləsinin ardıc cinsinə aid bitki növü.

Mənbə


Blue Pine (Pinus wallichiana) at Bhandakthathaatch (8000 ft) I IMG 7363.jpg İynəyarpaqlılar ilə əlaqədar bu məqalə qaralama halındadır. Məqaləni redaktə edərək Vikipediyanı zənginləşdirin. Etdiyiniz redaktələri mənbə və istinadlarla əsaslandırmağı unutmayın.
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Qalınqabıq ardıc: Brief Summary ( азерски )

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Qalınqabıq ardıc (lat. Juniperus deppeana) — sərvkimilər fəsiləsinin ardıc cinsinə aid bitki növü.

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Alligator-Wacholder ( германски )

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Der Alligator-Wacholder (Juniperus deppeana) ist eine Pflanzenart aus der Gattung der Wacholder (Juniperus) in der Familie der Zypressengewächse (Cupressaceae).

Beschreibung

 src=
Zweig mit Nadeln

Habitus

Der Alligator-Wacholder ist ein immergrüner Baum oder Strauch, der Wuchshöhen von etwa 10 bis 15 (selten bis zu 21) Meter und Brusthöhendurchmesser von 25 bis 120 Zentimeter erreicht. Die Krone von freistehenden Bäumen ist breit und ungleichmäßig kegelförmig. Sie besitzen einen relativ kurzen und kräftigen Stamm. Die Strauchform wächst breit und weit ausladend. Die vierkantigen Zweige erreichen Durchmesser von circa 1 Millimeter.

Rinde

 src=
Borke

Namensgebend für den Alligator-Wacholder ist die dunkel rötlich-braune bis schwärzlich gefärbte Borke, die aufgrund ihrer regelmäßig rechteckigen Schuppung an die Haut von Alligatoren erinnert. Sie wird zwischen 2,5 und 10 Zentimeter dick. Die Schuppen erreichen Durchmesser von 2,5 bis 5 Zentimeter. Tiefere Rindenschichten sind rötlich braun bis violett gefärbt. Die dünnen Zweige besitzen eine blass blaugrüne Rinde, die sich nach Abfall der Nadeln hell rötlich braun verfärbt.

Holz

Das hellgelbe, manchmal mit roten Streifen versehene Kernholz unterscheidet sich farblich vom schmalen weißlichen Splintholz. Das Holz ist leicht, weich, dichtfaserig, dauerhaft und spröde. Die Rohdichte wird je nach Quelle mit 0,453 oder 0,58 g/cm³ angegeben.

Blätter

Der Alligator-Wacholder bildet nadel- und schuppenförmige Blätter aus. Die undeutlich gekielten Schuppenblätter sind 1 bis 3 Millimeter lang und besitzen eine bläulich-grüne Farbe. Sie stehen zu zweit oder zu dritt am Zweig und überlappen sich. Sie besitzen ein stumpfes oder spitzes Ende und eine punktförmige Drüse. Die unterseits gekielten nadelförmigen Blätter sind länger als die Schuppenblätter und spitzen sich plötzlich zu. Man findet sie hauptsächlich an jungen Bäumen. Sie stehen zu zweit oder zu dritt am Zweig.

Blüten, Zapfen und Samen

 src=
Zweig mit Beerenzapfen

Alligator-Wacholder sind zweihäusig getrenntgeschlechtig (diözisch) und windblütig (Anemophilie). Die Blütezeit reicht von Januar bis März. Die circa 3 Millimeter langen männlichen Blüten sind fleischig und setzen sich aus 10 bis 12 schuppenförmigen Staubblättern zusammen. Die Samenanlagen der weiblichen Blütenzapfen befinden sich an den eiförmigen und zugespitzten Schuppen. Die zunächst blaugrauen, 8 bis 12 Millimeter großen, beerenförmigen Zapfen sind erst im 2. Jahr im September bis Dezember reif und dann rotbraun sowie weiß bereift. Das essbare „Fruchtfleisch“ ist zur Reife trocken, mehlig und aromatisch. Jeder gestielte Zapfen enthält 3 bis 5 etwa 5 Millimeter große, braune Samen.

Die Samen sind an einer oder zwei Seiten etwas abgeflacht. Das Tausendkorngewicht liegt bei etwa 35,71 Gramm.

Chromosomenzahl

Diese Wacholderart besitzt eine Chromosomenzahl von 2n = 22.

Verbreitung und Standort

 src=
Verbreitungskarte
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Alligator-Wacholder (Juniperus deppeana), Zweig mit Zapfen

Das natürliche Verbreitungsgebiet des Alligator-Wacholders inklusive seiner Varietäten liegt hauptsächlich im Südwesten und zentralen Süden der USA und im nördlichen Mexiko. Es erstreckt sich dabei von den Bergen im mittleren und südlichen Arizona über den Südwesten New Mexicos und den Westen von Texas südwärts bis in die mexikanischen Provinzen Sonora, Chihuahua und Coahuila. Weiters kommt diese Art in isolierten Gebieten in Zentralmexiko, auch in Südmexiko und im angrenzenden Guatemala vor.

Der Alligator-Wacholder besiedelt vor allem trockene Kalksteinböden meist an der Baumgrenze auf Höhenlagen von 1.330 bis 2.660 Meter. Er kommt oft gemeinsam mit der Stein-Kiefer (Pinus edulis), der Einblättrigen Kiefer (Pinus monophylla), der Gelb-Kiefer (Pinus ponderosa), verschiedenen Eichen-Arten (Quercus) und anderen Wacholder-Arten (Juniperus) vor. In europäischen Sammlungen ist er eher selten zu finden.

Systematik

Der Alligator-Wacholder (Juniperus deppeana Steud.)[1] wird innerhalb der Gattung Wacholder (Juniperus) je nach Autor in die Untergattung oder die Sektion Sabina gestellt. Sie wird in verschiedene Varietäten unterteilt, die in diversen Quellen teilweise als Formen und vereinzelt auch als Unterarten bezeichnet werden. Hier wird Robert P. Adams und Andrea E. Schwarzbach gefolgt, die 2006 nach Analyse von DNA-Sequenzen vier Varietäten beschreiben und innerhalb der Varietät Juniperus deppeana var. deppeana drei Formen angeben[2]. Synonyme für Juniperus deppeana Steud. sind Juniperus mexicana Schiede & Deppe und Juniperus pachyphloea Torr. Das Artepitheton deppeana wurde zu Ehren des deutschen Naturforschers Ferdinand Deppe gewählt[3].

Varietäten und Formen

Es werden folgende Varietäten unterschieden:

  • Juniperus deppeana Steud. var. deppeana (Syn.: Juniperus deppeana var. pachyphlaea (Torr.) Martínez), die Nominatform, kommt in den US-amerikanischen Bundesstaaten Arizona, New Mexico und Texas vor; weiters in den mexikanischen Bundesstaaten Sonora, Coahuila, Nuevo León, Tamaulipas, Zacatecas, San Luis Potosí, Aguascalientes, Hidalgo, México, Puebla, Tlaxcala, Veracruz mit drei Formen vor:
    • Juniperus deppeana Steud. var. deppeana f. elongata R.P.Adams ist eine zerstreut wachsende Form in den Davis Mountains der Region Trans-Pecos, Texas.
    • Juniperus deppeana Steud. var. deppeana f. sperryi (Correll) R.P.Adams wird in anderen Quellen auch als Varietät Juniperus deppeana var. sperryi Correll [4] beschrieben. Diese Form ist in nur drei Beständen in den Davis Mountains der Region Trans-Pecos, Texas und möglicherweise mit einem Fund im mexikanischen Bundesstaat Sonora bekannt. Die Form besitzt eine gefurchte Borke, die sich in Streifen ablöst.
    • Juniperus deppeana Steud. var. deppeana f. zacatecensis (Martínez) R.P.Adams wird auch als Varietät Juniperus deppeana Steud. var. zacatecensis Martínez [5] beschrieben und ist in den mexikanischen Bundesstaaten Zacatecas, dem benachbarten Durango und Aguascalientes anzutreffen. Diese Form findet sich in Waldlandschaften und Grasflächen auf Hügeln zusammen mit Eichen, Kiefern, Pinyon-Kiefern und anderen Wacholdern. Das Verbreitungsgebiet beschränkt sich auf Höhenlagen zwischen 1.980 und 2.470 m.
  • Juniperus deppeana Steud. var. gamboana (Martínez) R.P.Adams ist im mexikanischen Bundesstaat Chiapas sowie im angrenzenden Departamento Huehuetenango in Guatemala verbreitet. In den Bergen von Chiapas besiedelt diese Varietät Kalksteinböden in Kiefern-, Eichen- und Wacholderwäldern in Höhenlagen von 1.670 bis 2.200 m. In Guatemala findet man diesen Wacholder auf Kalksteinhängen in der Sierra de los Cuchumatanes auf Höhen von 1.920 bis 2.140 m. Sie wird von manchen Autoren auch als eigenständige Art angesehen: Juniperus gamboana Martínez.[6]
  • Juniperus deppeana Steud. var. patoniana (Martínez) Zanoni kommt im Norden des Bundesstaates Sonora und im Bundesstaat Durango in Mexiko vor.
  • Juniperus deppeana Steud. var. robusta Martínez[7] kommt in den mexikanischen Bundesstaaten Sonora, Chihuahua, Durango und Zacatecas vor. Diese Varietät wird zwischen 10 und 25 Meter hoch und die Borke zwischen 2 und 4 Zentimeter dick.

Nutzung

Das Holz des Alligator-Wacholders dient als Brennmaterial und zur Herstellung von Zaunpfählen. Es kann erst nach Mischung mit Holz von anderen Arten zu Papier verarbeitet werden. Die Beerenzapfen dienten verschiedenen Indianerstämmen als Nahrung.

Gefährdung und Schutzmaßnahmen

Der Alligator-Wacholder wird von der Weltnaturschutzunion IUCN in der Roten Liste gefährdeter Arten geführt und insgesamt als nicht gefährdet („Least Concern“)[8] bezeichnet. Allerdings werden Teile der Art, nämlich eine Varietät und zwei Formen als gefährdet gelistet. Dies sind folgende Taxa (IUCN führt alle drei als Varietäten):

  • Juniperus deppeana Steud. var. robusta Martínez wird von der IUCN weiterhin als Einheit mit der durch andere Quellen abgespaltenen Varietät Juniperus deppeana Steud. var. patoniana (Martínez) Zanoni gesehen und also auch gemeinsam mit ihr in die Bedrohungsstufe gefährdet („Vulnerable“) gereiht. Als Gefährdungsursachen werden unter anderem intensive Abholzung in Teilen des Verbreitungsgebiets, Ziegen und Überweidung angegeben. Stockausschlag-Nutzung der Bäume und Schonung der großen Exemplare als Schattenspender führen zu einem unausgeglichenen Bestand. Das Verbreitungsgebiet der Varietät ist zwar groß, aber die Subpopulationen sind klein und verstreut.[9]
  • Juniperus deppeana Steud. var. deppeana f. sperryi (Corell) R.P. Adams – diese Form führt die IUCN als Juniperus deppeana Steud. var. sperryi Corell als vom Aussterben bedroht („Critically Endangered“), da es durch Überweidung und Feuer keine ausreichenden Möglichkeiten zur Erholung des geringen Bestands (ca. 50 ausgewachsene Exemplare) gibt.[10]
  • Juniperus deppeana Steud. var. deppeana f. zacatecensis (Martínez) R.P. ADAMS – auch diese Form betrachtet die IUCN als Varietät Juniperus deppeana Steud. var. zacatecensis Martínez und listet sie als stark gefährdet („Endangered“). Der Bestand ist klein und nimmt ab. Das Verbreitungsgebiet liegt in einer Region, wo Weidewirtschaft betrieben wird. Die Haupt-Gefährdungsursachen sind Holzfällung und Bereinigung von Flächen für die Landwirtschaft.[11]

Literatur

  • Peter Schütt, Horst Weisgerber, Hans J. Schuck, Ulla Lang, Bernd Stimm, Andreas Roloff: Lexikon der Nadelbäume. Verbreitung – Beschreibung – Ökologie – Nutzung; die große Enzyklopädie. Nikol, Hamburg 2004, ISBN 3-933203-80-5, S. 209–212.

Einzelnachweise

  1. Juniperus deppeana im Germplasm Resources Information Network (GRIN), USDA, ARS, National Genetic Resources Program. National Germplasm Resources Laboratory, Beltsville, Maryland. Abgerufen am 4. Juni 2010.
  2. Robert P. Adams, Andrea E. Schwarzbach: Infraspecific adjustments in Juniperus deppeana (Cupressaceae). In: Phytologia. Band 88, Nr. 3, 2006, S. 227–232 (PDF (Memento vom 13. September 2011 im Internet Archive)).
  3. Al Schneider: Southwest Colorado Wildflowers, Ferns, & Trees. Archiviert vom Original am 17. April 2010; abgerufen am 16. Juni 2020 (englisch).
  4. Juniperus deppeana var. sperryi im Germplasm Resources Information Network (GRIN), USDA, ARS, National Genetic Resources Program. National Germplasm Resources Laboratory, Beltsville, Maryland.
  5. Juniperus deppeana var. zacatecensis im Germplasm Resources Information Network (GRIN), USDA, ARS, National Genetic Resources Program. National Germplasm Resources Laboratory, Beltsville, Maryland. Abgerufen am 4. Juni 2010.
  6. Rafaël Govaerts (Hrsg.): Juniperus. In: World Checklist of Selected Plant Families (WCSP) – The Board of Trustees of the Royal Botanic Gardens, Kew, abgerufen am 28. März 2019.
  7. Juniperus deppeana var. robusta im Germplasm Resources Information Network (GRIN), USDA, ARS, National Genetic Resources Program. National Germplasm Resources Laboratory, Beltsville, Maryland. Abgerufen am 4. Juni 2010.
  8. Juniperus deppeana in der Roten Liste gefährdeter Arten der IUCN 2013. Eingestellt von: A. Farjon, 2011. Abgerufen am 17. Juli 2020.
  9. Juniperus deppeana var. robusta in der Roten Liste gefährdeter Arten der IUCN 2013. Eingestellt von: A. Farjon, 2011. Abgerufen am 17. Juli 2020.
  10. Juniperus deppeana var. sperryi in der Roten Liste gefährdeter Arten der IUCN 2013. Eingestellt von: A. Farjon, 2011. Abgerufen am 17. Juli 2020.
  11. Juniperus deppeana var. zacatecensis in der Roten Liste gefährdeter Arten der IUCN 2013. Eingestellt von: A. Farjon, 2011. Abgerufen am 17. Juli 2020.
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Alligator-Wacholder: Brief Summary ( германски )

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Der Alligator-Wacholder (Juniperus deppeana) ist eine Pflanzenart aus der Gattung der Wacholder (Juniperus) in der Familie der Zypressengewächse (Cupressaceae).

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Juniperus deppeana ( удмуртски )

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 src=
Juniperus deppeana
 src=
Juniperus deppeana
 src=
Juniperus deppeana

Juniperus deppeana (лат. Juniperus deppeana ) – Cupressaceae семьяысь шор но уйпал Мексикаын но лымшор — шунды пуксён пал Америкалэн Огазеяськем Штатъёсаз будӥсь сусыпу. Ӝуждалаез ог 10—15 м.

Вариететъёс

  • Juniperus deppeana var. deppeana
  • Juniperus deppeana var. pachyphlaea (syn. J. pachyphlaea)
  • Juniperus deppeana var. robusta (syn. J. deppeana var. patoniana)
  • Juniperus deppeana var. sperryi .
  • Juniperus deppeana var. zacatecensis
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Juniperus deppeana: Brief Summary ( удмуртски )

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 src= Juniperus deppeana  src= Juniperus deppeana  src= Juniperus deppeana

Juniperus deppeana (лат. Juniperus deppeana ) – Cupressaceae семьяысь шор но уйпал Мексикаын но лымшор — шунды пуксён пал Америкалэн Огазеяськем Штатъёсаз будӥсь сусыпу. Ӝуждалаез ог 10—15 м.

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Juniperus deppeana ( англиски )

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Juniperus deppeana (alligator juniper or checkerbark juniper) is a small to medium-sized tree reaching 10–15 metres (33–49 feet) in height. It is native to central and northern Mexico and the southwestern United States.

Description

The tree reaches 10–15 metres (33–49 feet), rarely 25 m (82 ft), in height. The bark is usually very distinctive, unlike other junipers, hard, dark gray-brown, cracked into small square plates superficially resembling alligator skin; it is however sometimes like other junipers, with stringy vertical fissuring. The shoots are 1–1.5 millimetres (132116 inch) in diameter. On juvenile specimens, the leaves are needle-like and 5–10 mm (31638 in) long. The leaves are arranged in opposite decussate pairs or whorls of three; in adulthood they are scale-like, 1–2.5 mm (11618 in) long (up to 5 mm) and 1–1.5 mm broad. The cones are berrylike, 7–15 mm (14916 in) wide, green when young and maturing to orange-brown with a whitish waxy bloom,. These contain 2–6 seeds, which mature in about 18 months. The male cones are 4–6 mm (31614 in) long, and shed their pollen in spring. The species is largely dioecious, producing cones of only one sex on each tree, but occasional trees are monoecious.

Taxonomy

There are five varieties, not accepted as distinct by all authorities:

  • Juniperus deppeana var. deppeana. Throughout the range of the species. Foliage dull gray-green with a transparent or yellowish resin spot on each leaf; cones 7–12 mm (1412 in) diameter.
  • Juniperus deppeana var. pachyphlaea (syn. J. pachyphlaea). Arizona, New Mexico, northernmost Mexico. Foliage strongly glaucous with a white resin spot on each leaf; cones 7–12 mm diameter.
  • Juniperus deppeana var. robusta (syn. J. deppeana var. patoniana). Northwestern Mexico. Cones larger, 10–15 mm (3858 in) diameter.
  • Juniperus deppeana var. sperryi. Western Texas, very rare. Bark furrowed, not square-cracked, branchlets pendulous; possibly a hybrid with J. flaccida.
  • Juniperus deppeana var. zacatecensis. Zacatecas. Cones large, 10–15 mm diameter.

Etymology

Native American names include táscate and tláscal.

Distribution and habitat

Vastly split trunk in Prescott, Arizona

It is native to central and northern Mexico (from Oaxaca northward) and the southwestern United States (Arizona, New Mexico, western Texas). It grows at moderate altitudes of 750–2,700 m (2,460–8,860 ft) on dry soils.

Ecology

The berrylike cones are eaten by birds and mammals.[2][3]

Uses

Berries from alligator juniper growing in the Davis Mountains of West Texas are used to flavor gin, including one produced by WildGins Co. in Austin, Texas.[4]

References

  1. ^ Farjon, A. (2013). "Juniperus deppeana". IUCN Red List of Threatened Species. 2013: e.T42231A2964728. doi:10.2305/IUCN.UK.2013-1.RLTS.T42231A2964728.en. Retrieved 12 November 2021.
  2. ^ Little, Elbert L. (1994) [1980]. The Audubon Society Field Guide to North American Trees: Western Region (Chanticleer Press ed.). Knopf. p. 313. ISBN 0394507614.
  3. ^ Whitney, Stephen (1985). Western Forests (The Audubon Society Nature Guides). New York: Knopf. p. 370. ISBN 0-394-73127-1.
  4. ^ Elmer, Nicole L. (2020-01-09). "The Texas Eight: Love 'Em, Hate 'Em, or Drink 'Em". University of Texas at Austin Biodiversity Center. Retrieved 2021-04-15.

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Juniperus deppeana: Brief Summary ( англиски )

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Juniperus deppeana (alligator juniper or checkerbark juniper) is a small to medium-sized tree reaching 10–15 metres (33–49 feet) in height. It is native to central and northern Mexico and the southwestern United States.

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Juniperus deppeana ( шпански; кастиљски )

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Juniperus deppeana es una planta de la familia de las cupresáceas. Es originaria de Norteamérica, desde el sur de Estados Unidos (Arizona, Nuevo México, Texas) hasta el oeste de Guatemala. Se conoce comúnmente como sabino o táscate.

 src=
Vista de la planta
 src=
Conos

Descripción

Este árbol puede calificarse como un arbusto arborescente hasta árbol corto. Es corpulento, perennifolio, monopódico. Puede medir de 3 a 10 m (con un máximo de 20 m) con un diámetro a la altura del pecho de 20 a 50 cm. Es de copa ampliamente cónica o densa y globular o esparcidamente ramificada en bosques densos y en árboles viejos. Hojas por lo general opuestas, escuamiformes. Tiene un solo tronco principal, a veces ramificándose 1 hasta 2 m por encima de la base, tronco tortuoso, tiene ramas rígidas, ascendentes, que se dividen en tres dimensiones. Su corteza externa es una estructura laminar dividida en placas cuadrangulares, o bien en estructura fibrosa.

Su cono masculino es oval-elipsoide, subtetrágono, mide de 3 a 6 mm de largo, tiene un color café-amarillento, formado por 14 escamas ovadas. El cono femenino es formado por 6 escamas ovaladas, subgloboso a anchamente elipsoide, mide de 8 a 20 mm de diámetro, con un color moreno rojizo a café. Tiene un fruto megaestróbilo maduro subgloboso hasta ampliamente elipsoide, el cual mide de 8 a 15 mm de diámetro, es de color rojizo-canela hasta rojizo-moreno, pruinoso por encima, la pulpa seca fibrosa. El fruto maduro permanece en el árbol. Las semillas son color chocolate morenas a color canela claro, ampliamente ovadas hasta angulares, mide de 6 a 7 mm de largo por 4 a 6 mm de ancho, hilo de hasta tres cuartos de longitud de la semilla. Es de sexualidad monoica.

Es una especie de lento crecimiento. Los árboles jóvenes incrementan su diámetro 15 mm cada 10 años; los árboles viejos (170 años) solamente 0,1 cm por década. La máxima longevidad reportada es de 500 años.

Es resistente a la sequía, al fuego y al daño por termitas. También resiste suelos compactados y pedregosos, suelos pobres (de baja fertilidad) y suelos alcalinos (suelos arcillosos, con pH elevado). Por otro lado, es susceptible a insectos, arañas rojas, daño por nemátodos que atacan su raíz, al daño por hongos que atacan a la semilla. Son sensibles al tizón del cedro (Phomopsis junipervora). Una vez introducido en el semillero es difícil erradicarlo.

Hábitat

Prolifera en laderas medianas e inferiores de cerros, lomeríos, orilla de arroyos, potreros e individualmente en campos de cultivo. Crece en una amplia variedad de suelos incluyendo los alcalinos, los de contenido moderado en sales solubles y con drenaje deficiente. Precisa un suelo somero con materia orgánica, arenoso profundo, rojizo arcilloso pedregoso, arenoso rocoso o suelo profundo de llanuras.

 src=
Juniperus deppeana con poco follaje, haciendo posible ver las características del tronco.

Usos

  • Aromatizante (fruto, hoja, tronco): Se extraen aceites esenciales aromáticos.
  • Combustible (madera): Leña, carbón. Excelente combustible de alto valor calorífico, arde lento y produce poco humo y hollín.
  • Construcción (madera): Construcción rural.
  • Forrajero (hoja): Especie forrajera. Las hojas de este Juniperus son más apetecibles que las de otras especies.
  • Maderable (madera): Gran durabilidad. Muebles, postes, durmientes y fabricación de lápices. Destacan los cofres, ventanas, armarios, puertas y lambrines y los muebles de tipo colonial. Escasa disponibilidad de productos de escuadría de largas dimensiones. Presencia de defectos naturales como nudos, inclusión.

Taxonomía

Juniperus deppeana fue descrita en 1840 por Ernst Gottlieb von Steudel en Nomenclator Botanicus. Editio secunda 1: 835.[1]

Etimología

Juniperus: nombre genérico que procede del latín iuniperus, que es el nombre del enebro[2]
deppeana: epíteto dado en honor a Ferdinand Deppe (1794-1861), pintor, naturalista, explorador y botánico alemán

Sinonimia

  • Cupressus sabinoides Kunth
  • Juniperus foetida Spach
  • Juniperus gigantea Roezl
  • Juniperus mexicana Schltdl. & Cham.
  • Juniperus mexicana Spreng.
  • Juniperus tetragona Schltdl.
  • Juniperus thurifera Spach
  • Sabina gigantea (Roezl) Antoine
  • Sabina mexicana (Schltdl. & Cham.) Antoine[3][4]

Referencias

  1. «Juniperus deppeana». Tropicos.org. Missouri Botanical Garden. Consultado el 30 de noviembre de 2014.
  2. Juniperus en Flora de Canarias
  3. «Juniperus deppeana». The Plant List. Consultado el 30 de noviembre de 2014.
  4. «Juniperus deppeana». Royal Botanic Gardens, Kew: World Checklist of Selected Plant Families. Consultado el 30 de noviembre de 2014.

Bibliografía

  • "Nomenclator Botanicus". Editio secunda 1: 835. 1840.
  • Estrada Martínez y J.R. Aguirre Rivera. 1995.
  • Logan, T.J. 1992.
  • Luke, A.G.R., H.J. Harvey and R.N. Humphries. 1982.
  • Martínez, Maximino. 1979.
  • Styles, B.T. and C.G. Hughes. 1988.
  • Zamudio, Sergio y Eleazar Carranza. 1994.

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Juniperus deppeana: Brief Summary ( шпански; кастиљски )

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Juniperus deppeana es una planta de la familia de las cupresáceas. Es originaria de Norteamérica, desde el sur de Estados Unidos (Arizona, Nuevo México, Texas) hasta el oeste de Guatemala. Se conoce comúnmente como sabino o táscate.

 src= Vista de la planta  src= Conos
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Juniperus deppeana ( француски )

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Juniperus deppeana, appelé communément genévrier alligator[1] ou genévrier à écorce d'alligator[2], est une espèce de plante nord-américaine de la famille des Cupressaceae.

Description

 src=
Écorce de Juniperus deppeana

Juniperus deppeana est un arbre ou un arbuste à feuilles persistantes qui atteint une hauteur d'environ 10 à 15 mètres (rarement jusqu'à 21) et un diamètre à hauteur de poitrine de 25 à 120 centimètres. La cime est large et irrégulièrement conique. Les arbres ont un tronc relativement court et solide. Les branches atteignent un diamètre d'environ 1 millimètre.

Juniperus deppeana est nommé d'après l'écorce de couleur brun rougeâtre foncé à noirâtre, qui rappelle la peau des alligators en raison de son écaillage rectangulaire régulier. Elle mesure entre 2,5 et 10 cm d'épaisseur. Les écailles atteignent un diamètre de 2,5 à 5 cm. Les couches d'écorce plus profondes sont de couleur brun rougeâtre à violette. Les fines branches ont une écorce bleu-vert pâle qui devient brun rougeâtre clair après la chute des aiguilles.

Le duramen jaune clair, parfois avec des rayures rouges, diffère en couleur de l'aubier étroit blanchâtre. Le bois est léger, doux, densément fibreux, durable et cassant. La densité apparente est donnée à 0,453 ou 0,58 g/cm3 selon la source.

Juniperus deppeana forme des feuilles aciculaires et écailleuses. Les feuilles squameuses indistinctement carénées mesurent 1 à 3 mm de long et ont une couleur vert bleuâtre. Deux ou trois d'entre elles se tiennent sur la branche et se chevauchent. Elles ont une extrémité émoussée ou pointue et une glande ponctuelle. Les feuilles en forme d'aiguille qui sont carénées sur la face inférieure sont plus longues que les feuilles écailleuses et viennent soudainement à une tête. On peut les trouver principalement sur les jeunes arbres. Il y en a deux ou trois sur la branche.

Juniperus deppeana est dioïque et anémophilie, mais les arbres occasionnels sont monoïques. La période de floraison s'étend de janvier à mars. Les fleurs mâles d'environ 3 mm de long sont charnues et se composent de 10 à 12 étamines écailleuses. Les ovules des cônes femelles sont situés sur les écailles ovoïdes et pointues. Les cônes initialement bleu-gris, de 8 à 12 mm de large, en forme de baies ne sont mûrs que la deuxième année de septembre à décembre, puis brun rougeâtre et blanc givré. Chaque cône contient de 3 à 5 graines brunes d'environ 5 mm. Les graines sont un peu aplaties sur un ou deux côtés. Le poids de mille pollens est d'environ 35,71 grammes.

Cette espèce de genévrier a un nombre chromosomique de 2n = 22.

Répartition

 src=
Aire de répartition des sous-espèces de Juniperus deppeana

L'aire de répartition naturelle de Juniperus deppeana , y compris ses variétés, se situe principalement dans le sud-ouest et le centre-sud des États-Unis et dans le nord du Mexique. Il s'étend des montagnes du centre et du sud de l'Arizona au sud-ouest du Nouveau-Mexique et au sud du Texas jusqu'aux provinces mexicaines de Sonora, Chihuahua et Coahuila. De plus, cette espèce est présente dans des zones isolées du centre du Mexique, également dans le sud du Mexique et au Guatemala voisin.

Le genévrier alligator colonise principalement les sols calcaires secs principalement à des altitudes de 1 330 à 2 660 m.

On le trouve rarement dans les collections européennes.

Sous-espèces

Juniperus deppeana comprend les sous-espèces suivantes :

  • Juniperus deppeana var. deppeana (Syn. : Juniperus deppeana var. pachyphlaea), la sous-espèce la plus commune, a trois formes :
    • Juniperus deppeana var. deppeana f. elongata est une forme de croissance dispersée dans les montagnes Davis de la région de Trans-Pecos, au Texas.
    • Juniperus deppeana var. deppeana f. sperryi est décrite dans d'autres sources comme la variété Juniperus deppeana var. sperryi. Cette forme n'est connue que dans trois stocks dans les montagnes Davis de la région de Trans-Pecos, au Texas et peut-être avec une découverte dans l'État mexicain de Sonora. La forme a une écorce sillonnée qui se sépare en bandes.
    • Juniperus deppeana var. deppeana f. zacatecensis est aussi décrite comme Juniperus deppeana var. zacatecensis. On le trouve dans les États mexicains de Zacatecas, Durango et Aguascalientes. Cette forme se trouve dans les paysages forestiers et les zones herbeuses sur les collines avec les chênes, les pins, les pins à pignons et d'autres genévriers. L'aire de répartition est limitée à des altitudes comprises entre 1 980 et 2 470 m.
  • Juniperus deppeana var. gamboana est répandu dans l'État mexicain du Chiapas et au Guatemala, dans le département de Huehuetenango. Dans les montagnes du Chiapas, cette variété colonise les sols calcaires des forêts de pins, de chênes et de genévriers à des altitudes de 1 670 à 2 200 m. Au Guatemala, on peut trouver ce genévrier sur des pentes calcaires dans la Sierra de los Cuchumatanes à des altitudes de Modèle:Unité 1920 à 2140 m.
  • Juniperus deppeana var. patoniana est présent dans le nord de l'État de Sonora et dans l'État de Durango au Mexique.
  • Juniperus deppeana var. robusta est présent dans les États mexicains de Sonora, Chihuahua, Durango et Zacatecas. Cette variété mesure entre 10 et 25 m de haut et l'écorce entre 2 et 4 cm d'épaisseur.
  • Juniperus deppeana var. Sperryi est très rare dans l'ouest du Texas. L'écorce est sillonnée, non carrée, les rameaux pendants ; peut-être un hybride avec Juniperus flaccida (en).

Écologie

Il se rencontre souvent avec des espèces de pins comme Pinus edulis, Pinus monophylla, Pinus ponderosa, Pinus leiophylla, des espèces de chêne (Quercus) et d'autres espèces de genévrier. Il est aussi en association avec Cercocarpus breviflorus, Astragalus hypoxylus (en), Lycium pallidum, Fendlera rupicola (en).

Juniperus deppeana sert de plante hôte aux chenilles de Periploca atrata, Sphinx dollii, Callophrys gryneus.

Les cônes sont une nourriture pour des oiseaux comme le Geai des pinèdes et des mammifères, comme les rongeurs Neotoma albigula et Sigmodon ochrognathus[3].

Utilisation

Le bois de genévrier alligator est utilisé comme combustible et pour la production de poteaux de clôture. Il ne peut être transformé en papier qu'après avoir été mélangé avec du bois d'autres types. Les cônes de baies servaient de nourriture à diverses tribus indiennes.

Notes et références

  • (de) Cet article est partiellement ou en totalité issu de l’article de Wikipédia en allemand intitulé .
  1. « Juniperus deppeana », sur foreska.com (consulté le 5 avril 2020)
  2. « Juniperus deppeana US5195 », sur Pépinière Aoba (consulté le 5 avril 2020)
  3. (en) Stephen Whitney, Western Forests : (The Audubon Society Nature Guides), Knopf, 1985, 671 p. (ISBN 0-394-73127-1, lire en ligne), p. 370

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Juniperus deppeana: Brief Summary ( француски )

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Juniperus deppeana, appelé communément genévrier alligator ou genévrier à écorce d'alligator, est une espèce de plante nord-américaine de la famille des Cupressaceae.

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Juniperus deppeana ( италијански )

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Juniperus deppeana Steud., 1841[2] è un albero della famiglia delle Cupressaceae, diffusa negli Stati Uniti sud-occidentali e in Messico.

In inglese è chiamata Alligator Juniper o Checkerbark Juniper; fra i nomi con cui i nativi americani chiamano la pianta vi sono: táscate e tláscal[3].

Descrizione

 src=
La tipica corteccia che sembra la pelle di alligatore

È un albero di taglia da piccola a media, che raggiunge i 10–15 m (raramente i 25 m) di altezza. Solitamente, la corteccia è molto distintiva: a differenza di altri Juniperus, è dura, di colore grigio scuro/marrone, in superficie rotta in piccole piastrine quadrate, che ricordano la pelle dell'alligatore; è a volte, comunque, come altri ginepri, con fessurazioni verticali cordiformi.

Germogli

I germogli hanno diametro pari a 1-1,5 mm.

Foglie

Le foglie sono disposte in coppie opposte decussate oppure in spire da tre. Le foglie adulte sono simili a scaglie, lunghe 1-2,5 mm (giungono a 5 mm sui germogli principali) e larghe 1-1,5 mm. Le foglie giovani (presenti solo sulle nuove piantine) sono simili ad aghi, lunghe 5–10 mm.

Coni

I coni sono simili a bacche, hanno diametro di 7–15 mm, verdi, poi arancio-marroni alla maturazione, con un fiore biancastro e ceroso, e contengono 2-6 semi. I coni maturano in circa 18 mesi. I coni maschili sono lunghi 4–6 mm e disperdono il loro polline in primavera. Juniperus deppeana è una pianta fortemente dioica: ogni pianta produce coni di un unico sesso; occasionalmente, alcuni alberi possono essere monoici.

Cromosomi

J. deppeana è un organismo diploide, con numero di cromosomi pari a 2n = 22.

Distribuzione e habitat

J. deppeana è nativa del Messico centrale e settentrionale (da Oaxaca verso nord) e degli stati statunitensi sudoccidentali (Arizona, Nuovo Messico, Texas occidentale). Cresce ad altitudini moderate, fra i 750 e i 2.700 m, su suoli asciutti.

 src=
Areale di Juniperus deppeana.

Tassonomia

Secondo GRIN[3], J. deppeana comprende quattro varietà:

  • Juniperus deppeana var. deppeana (anche nota con il sinonimo: Juniperus deppeana var. pachyphlaea). Fogliame grigio-verde scuro con macchie di resina trasparenti o giallognole su ogni foglia; coni da 7–12 mm di diametro. Presente in Arizona, New Mexico, parte più settentrionale del Messico.
  • Juniperus deppeana var. robusta (sinonimo J. deppeana var. patoniana). Messico nordoccidentale. Coni più grandi, 10–15 mm di diametro.
  • Juniperus deppeana var. sperryi. Texas occidentale, molto raro. Corteccia rugosa, non fratturata a quadrati, ramoscelli penduli, forse un ibrido con Juniperus flaccida.
  • Juniperus deppeana var. zacatecensis. Zacatecas. Coni grandi, 10-15

Note

  1. ^ (EN) Juniperus deppeana, su IUCN Red List of Threatened Species, Versione 2020.2, IUCN, 2020.
  2. ^ E.G. von Steudel, Nomencl. Bot., ed. 2, 835 (1841).
  3. ^ a b Juniperus deppeana Archiviato il 24 ottobre 2012 in Internet Archive. - GRIN

Bibliografia

  • (EN) R. P. Adams, Junipers of the World: The genus Juniperus, Trafford Publishing (2004), ISBN 1-4120-4250-X.
  • (DE) Peter Schütt, Horst Weisgerber, Hans J. Schuck, Ulla Lang, Bernd Stimm, Andreas Roloff, Lexikon der Nadelbäume. Verbreitung – Beschreibung – Ökologie – Nutzung in Die große Enzyklopädie, Nikol, Hamburg (2004), ISBN 3-933203-80-5, pagg. 209–212.

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Juniperus deppeana: Brief Summary ( италијански )

добавил wikipedia IT

Juniperus deppeana Steud., 1841 è un albero della famiglia delle Cupressaceae, diffusa negli Stati Uniti sud-occidentali e in Messico.

In inglese è chiamata Alligator Juniper o Checkerbark Juniper; fra i nomi con cui i nativi americani chiamano la pianta vi sono: táscate e tláscal.

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Juniperus deppeana ( норвешки )

добавил wikipedia NO
Juniperus deppeana Arten har bark som likner alligatorskinn
Arten har bark som likner alligatorskinn Vitenskapelig(e)
navn
: Juniperus deppeana Norsk(e) navn: — Biologisk klassifikasjon: Rike: Planteriket Divisjon: Karplanter Klasse: Nakenfrøede planter Orden: Bartrær Familie: Sypressfamilien Slekt: Juniperus IUCNs rødliste: livskraftig

Juniperus deppeana eller «Alligator Juniper» er en art av bartrær som tilhører einerslekten Juniperus i sypressfamilien. Den vokser på 750-2.700 meters høyde i Mexico og i det sørvestre og midtre USA opp til Arizona, New Mexico, og Texas.

 src=
Nærbilde av skudd med barnåler.

Arten er ofte lett å kjenne på den alligator-liknende barken, men noen ganger har den tynn og strimlet bark slik som andre einere. Den er inntil 15-25 meter høy og tåler tørke, og har grå-grønne, skjellaktige nåler inntil 1–5 mm lange. Unge nåler er inntil 10 mm lange. Den er oftest særbu med hann- og hunnblomster på ulike individer. Bærkonglene modner på 18 måneder til et brun-oransje, 7–15 mm stort bær med 2-6 frø. Hannkonglene er 4–6 mm store, gulbrune, og sprer sitt pollen i november-desember.

  • Varianter omfatter:
    • Juniperus deppeana var. deppeana. Hele utbredelsesområdet. Bladene er blasst grå-grønne med gjennomsiktig eller gulaktig kvaeprikk på hvert blad, bær 7–12 mm store.
    • Juniperus deppeana var. pachyphlaea = syn. Juniperus pachyphlaea. Arizona, New Mexico, nordligste Mexico. Foliage Hvert skjellaktige, runde blad har en hvit kvaeprikk, bær 7–12 mm store.
    • Juniperus deppeana var. robusta = syn. Juniperus deppeana var. patoniana. Nordvestlige Mexico. Større frøkongler, 10–15 mm store.
    • Juniperus deppeana var. sperryi. Vestlige Texas, meget sjelden, furete bark. Grener henger ned.
    • Juniperus deppeana var. zacatecensis. Utbredelse i Zacatecas i Mexico. Større frøkongler, 10–15 mm store.

Eksterne lenker

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Juniperus deppeana: Brief Summary ( норвешки )

добавил wikipedia NO

Juniperus deppeana eller «Alligator Juniper» er en art av bartrær som tilhører einerslekten Juniperus i sypressfamilien. Den vokser på 750-2.700 meters høyde i Mexico og i det sørvestre og midtre USA opp til Arizona, New Mexico, og Texas.

 src= Nærbilde av skudd med barnåler.

Arten er ofte lett å kjenne på den alligator-liknende barken, men noen ganger har den tynn og strimlet bark slik som andre einere. Den er inntil 15-25 meter høy og tåler tørke, og har grå-grønne, skjellaktige nåler inntil 1–5 mm lange. Unge nåler er inntil 10 mm lange. Den er oftest særbu med hann- og hunnblomster på ulike individer. Bærkonglene modner på 18 måneder til et brun-oransje, 7–15 mm stort bær med 2-6 frø. Hannkonglene er 4–6 mm store, gulbrune, og sprer sitt pollen i november-desember.

Varianter omfatter: Juniperus deppeana var. deppeana. Hele utbredelsesområdet. Bladene er blasst grå-grønne med gjennomsiktig eller gulaktig kvaeprikk på hvert blad, bær 7–12 mm store. Juniperus deppeana var. pachyphlaea = syn. Juniperus pachyphlaea. Arizona, New Mexico, nordligste Mexico. Foliage Hvert skjellaktige, runde blad har en hvit kvaeprikk, bær 7–12 mm store. Juniperus deppeana var. robusta = syn. Juniperus deppeana var. patoniana. Nordvestlige Mexico. Større frøkongler, 10–15 mm store. Juniperus deppeana var. sperryi. Vestlige Texas, meget sjelden, furete bark. Grener henger ned. Juniperus deppeana var. zacatecensis. Utbredelse i Zacatecas i Mexico. Større frøkongler, 10–15 mm store.
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Juniperus deppeana ( украински )

добавил wikipedia UK

Поширення, екологія

Країни зростання: Мексика (Чіуауа, Коауїла, Дуранго, Ідальго, Оахака, Пуебла, Сонора, Веракрус, Сакатекас); США (Аризона, Нью-Мексико, Техас). Росте на луках, чагарниках у ялівцевих лісових і відкритих соснових лісах, з, наприклад Opuntia, Agave, Cactaceae, Yucca, Solanum papita у відкритих місцях проживання; з Pinus cembroides, Pinus leiophylla, Pinus teocote, Juniperus flaccida, Quercus в чагарниках, рідколіссях і лісах; в напівзасушливих горах і більш посушливій межгорній зоні на сухих, кам'янистих схилах або в долинах і плато з піщаними ґрунтами, на вапняку, вулканічних покладах або інших типах порід. Висотний діапазон для цього виду від 750 м до 2750 м над рівнем моря.

Морфологія

Дерева дводомні, до 10-15 (-30) м, стовбур один; крона округла. Кора коричнева, розшаровується прямокутними пластинами Гілки від розлогих до висхідних. Листки зелені, але іноді здаються сріблястими, краї з дрібними зубцями; батогоподібні листки 3-6 мм, не сизі зверху; лускоподібні листки 1-2 мм, не перекриваються, верх від гострого до загостреного. Шишки зріють 2 роки, кулясті, 8-15 мм, від червонувато-коричневих до темно-червоно-коричневих, тьмяні, з 1-7 насінням. Насіння 6-9 мм.

Використання

Деревина може використовуватися локально для дрібномасштабних будівельних цілей і огорож для фермерських господарств, але комерційно не експлуатуються. Великі дерева були вирубані через їх міцну деревину особливо в частинах Мексики. У Мексиці саджають як посадку між полями в штаті Пуебла, разом з Agave americana.

Загрози та охорона

Цей вид має велику площу проживання розділену на кілька роз'єднаних сортів, деякі з них знаходяться під загрозою. В деяких регіонах Мексики поселення були скорочені у зв'язку з рубками і особливо змінами у землекористуванні (сільське господарство, випас худоби). Незважаючи на це, як видається, немає серйозної заклопотаність з приводу загрози зникнення для цього таксона, особливо в США. Цей ялівець присутній в кількох ПОТ в США і Мексиці.

Посилання


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Juniperus deppeana ( виетнамски )

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Juniperus deppeana là một loài thực vật hạt trần trong họ Cupressaceae. Loài này được Steud. mô tả khoa học đầu tiên năm 1840.[1]

Chú thích

  1. ^ The Plant List (2010). Juniperus deppeana. Truy cập ngày 28 tháng 5 năm 2014.

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Juniperus deppeana: Brief Summary ( виетнамски )

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Juniperus deppeana là một loài thực vật hạt trần trong họ Cupressaceae. Loài này được Steud. mô tả khoa học đầu tiên năm 1840.

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Можжевельник толстокорый ( руски )

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Царство: Растения
Подцарство: Зелёные растения
Отдел: Хвойные
Класс: Хвойные
Порядок: Сосновые
Семейство: Кипарисовые
Вид: Можжевельник толстокорый
Международное научное название

Juniperus deppeana Steud.

Охранный статус Wikispecies-logo.svg
Систематика
на Викивидах
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ITIS 194834NCBI 305627EOL 1061763GRIN t:316255IPNI 132473-2TPL kew-2332518

Можжеве́льник толстоко́рый (лат. Juniperus deppeana) — вид растений рода Можжевельник (Juniperus), семейства Кипарисовые (Cupressaceae).

Распространение и экология

Встречается в юго-западной части Северной Америки, в США произрастает в Аризоне, Нью-Мексико, в западном Техасе и в некоторых районах центральной и северной части Мексики. В естественных условиях растёт на высоте 750—2700 м над уровнем моря.

Ботаническое описание

 src=
Характерная для данного вида текстура коры

Вечнозелёное хвойное дерево, как правило, двудомное. Высота 10—15 м.

Кора серо-коричневая, разделена трещинами на небольшие квадратные участки.

Хвоя зелёная.

Шишкоягоды сферические, диаметром 7—15 мм.

Значение и применение

Древесина дерева устойчива против гниения.

В посадках весьма декоративен.

Таксономия

Вид Можжевельник толстокорый входит в род Можжевельник (Juniperus) семейства Кипарисовые (Cupressaceae) порядка Сосновые (Pinales).


ещё 6 семейств ещё от 50 до 67 видов порядок Сосновые род Можжевельник отдел Голосеменные семейство Кипарисовые вид
Можжевельник толстокорый
ещё 13—14 порядков голосеменных растений ещё 10 родов

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Можжевельник толстокорый: Brief Summary ( руски )

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Можжеве́льник толстоко́рый (лат. Juniperus deppeana) — вид растений рода Можжевельник (Juniperus), семейства Кипарисовые (Cupressaceae).

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