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Reference
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Description |
Comm #12231
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Pinus edulis - Juniperus spp. / Leymus salinus Woodland
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accession code: VB.CC.32052.CEGL002340
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Western Ecology Working Group of... |
0
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This woodland association is widespread throughout the Colorado Plateau, but limited to small stands on specific substrates. Stands tend to occupy the tops, shoulders, upper and middle slopes of ridges, as well as canyon sides. These sites range from moderately to steeply sloping (47% to more than 100% slopes), although a minority of stands occur on gentle slopes with gradients not exceeding 10%. Elevations range between 1483 and 2301 m (4865-7550 feet). Stands at higher elevations and latitudes (e.g., Black Canyon of the Gunnison National Park and Dinosaur National Monument) tend to be oriented to the south or west, but stands at lower elevations occur primarily on north or east aspects. Parent materials are variable but generally include a significant element of marine shale, sometimes redeposited with other rocks as alluvium or colluvium. Soils are rapidly drained and include sandy clay loams, clay loams and sandy loams. Total vegetation cover ranges from sparse (7%) to moderate (50%) in this variable community, with drier, more exposed sites supporting less overall plant cover. The canopy may be very open to moderate (5 to 30%), and consists of both <i>Pinus edulis</i> and <i>Juniperus osteosperma</i>. Either tree species may dominate the canopy. Shrubs are generally present but do not provide enough cover to constitute a stratum. Common species include <i>Ephedra viridis, Shepherdia rotundifolia, Opuntia</i> spp., and <i>Chrysothamnus viscidiflorus</i>. The herbaceous layer is more conspicuous than the shrub layer in this community, consisting of a variety of grasses, among which <i>Leymus salinus</i> is clearly dominant. Total herbaceous cover can range from 5% in sparse stands to more than 30% in more sheltered sites. Common associated herbaceous species include <i>Achnatherum hymenoides</i> and <i>Pleuraphis jamesii</i>. |
Comm #12232
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CEGL004708
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accession code: VB.CC.6228.CEGL004708
NOT CURRENTLY ACCEPTED
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EcoArt 2002 |
0
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Comm #12233
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Achnatherum hymenoides Colorado Plateau Herbaceous Vegetation
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accession code: VB.CC.32041.CEGL002343
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Western Ecology Working Group of... |
0
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This herbaceous vegetation association usually occurs in small patches (<1 hectare) on upland eolian sand deposits, as well as on sandy alluvial terraces and point bars along intermittent washes in eastern Utah and northwestern Colorado. It is likely to occur in small patches throughout the Colorado Plateau. Disturbance is usually a factor; upland sites often have blowing sand, and wash sites are subject to periodic flooding. Sites are flat to gently sloping (not exceeding 10%) between 1220 and 1815 m elevation. The unvegetated surface has high cover by bare soil or sand, low cover by litter, and biological soil crusts may have up to 30% cover. Soils are rapidly drained sands or sandy loams derived from alluvium or eolian deposits. Total vegetation cover in upland sites with blowing sand is usually quite sparse, rarely exceeding 10%. Sites on sandy terraces and point bars may have up to 30% cover by vascular plants, with another 25% cover provided by biological soil crusts. <i>Achnatherum hymenoides</i> is the dominant species, ranging in cover between 3 and 15%. A scattering of shrubs may be present, with no species exceeding 1% cover and the total not exceeding 5% cover. Associated shrubs include <i>Amsonia tomentosa, Artemisia filifolia, Atriplex canescens, Ephedra torreyana, Ephedra viridis, Poliomintha incana, Vanclevea stylosa, Gutierrezia sarothrae</i>, and <i>Opuntia polyacantha</i>. Some stands may contain scattered <i>Juniperus osteosperma</i> trees or saplings. Associated graminoids include the short bunchgrasses <i>Aristida purpurea, Sporobolus cryptandrus</i>, and <i>Pleuraphis jamesii</i>. Forbs present include <i>Abronia fragrans</i> and <i>Sphaeralcea parvifolia</i>. |
Comm #12234
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CEGL002403
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accession code: VB.CC.4848.CEGL002403
NOT CURRENTLY ACCEPTED
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EcoArt 2002 |
0
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Comm #12235
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CEGL002404
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accession code: VB.CC.4849.CEGL002404
NOT CURRENTLY ACCEPTED
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EcoArt 2002 |
0
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Comm #12236
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CEGL002405
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accession code: VB.CC.4850.CEGL002405
NOT CURRENTLY ACCEPTED
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EcoArt 2002 |
0
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Comm #12237
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CEGL001340
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accession code: VB.CC.3926.CEGL001340
NOT CURRENTLY ACCEPTED
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EcoArt 2002 |
0
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Comm #12238
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Ephedra torreyana / Achnatherum hymenoides - Pleuraphis jamesii Shrubland
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accession code: VB.CC.32023.CEGL002352
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Western Ecology Working Group of... |
0
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This shrubland association occurs in large patches on broad sandy plains, as well as in smaller patches on knolls, toeslopes and pediments. Sites are flat to gentle (up to 8-degree slopes), occur between 1220 and 2000 m elevation, and tend to be oriented to warm south or west aspects. The unvegetated surface has up to 90% exposure of sand or bare soil. Parent materials include Entrada, Navajo, Summerville and Carmel formation materials that have eroded to alluvial or eolian sands and clays. Soils are rapidly drained to well-drained loamy sands where derived from secondary materials or sandy clays where derived from underlying shales. Total vegetation cover ranges from 5 to 25% in this variable community, which includes stands that are shrub-herbaceous in structure as well as shrublands and sparse vegetation. Vegetation composition is characterized by an open canopy of <i>Ephedra torreyana</i> that ranges between 2 to 25% cover, with an understory codominated by <i>Achnatherum hymenoides</i> and <i>Pleuraphis jamesii</i> with between 2 and 15% cover. Associated shrubs include <i>Atriplex canescens, Opuntia polyacantha</i>, and <i>Gutierrezia sarothrae</i>. <i>Coleogyne ramosissima</i> is absent or has 1% or less cover. The remaining herbaceous layer often includes <i>Astragalus amphioxys, Malacothrix sonchoides, Sporobolus airoides, Sporobolus flexuosus</i>, and <i>Sphaeralcea parvifolia</i>. |
Comm #12239
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CEGL000617
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accession code: VB.CC.3225.CEGL000617
NOT CURRENTLY ACCEPTED
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EcoArt 2002 |
0
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Comm #12240
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Pinus ponderosa / Bromus inermis Ruderal Woodland
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accession code: VB.CC.37309.CEGL002943
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0
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This is a woodland of native <i>Pinus ponderosa</i> with an exotic grass understory. While currently reported from the Colorado Front Range and southwestern Utah, it undoubtedly is more widespread in the West. <i>Bromus inermis</i> has been seeded in thousands of hectares as pasture grass throughout the western U.S. It requires some sort of subirrigation or moisture, so is found escaped into riparian areas, draws and hollows. In some places the seeding took place beneath mature <i>Pinus ponderosa</i> trees, and in other locations, <i>Pinus ponderosa</i> is slowly invading the <i>Bromus inermis</i> pasture. Stands are dominated by <i>Bromus inermis</i> with 30-40% foliar cover, with an open, park-like structure to the overstory canopy of trees, either mature or young sapling size, contributing around 20% canopy cover. |
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