Vegetation Classification and Mapping Project Report - USGS

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Appendix C: Global and local plant community descriptions Ecological systems placement: Ecological system unique ID CES304.781 CES304.786 Ecological system name Inter-Mountain.Basins.Wash Inter-Mountain.Basins.Playa NatureServe conservation status: Global rank. G3 (23-Oct-2002). This is a very widespread, but limited and somewhat rare, alkaline playa vegetation type. It is not well studied, and it is poorly protected, but generally most stands are not very threatened. Where water is available from adjacent mountains, these areas are often converted to agriculture. However, their limited threats require a G3 rank. If many additional sites are discovered in Nevada, it could become a G4, and if the types associated with Sarcobatus turn out to be distinct from those with Atriplex canescens, it could be ranked higher. Protection of some sites in Nevada is important to assure that it remains secure throughout its range. Distribution: Globally. This playa community is widely distributed throughout the Intermountain West, ranging from southeastern Oregon south to Texas. Petrified Forest National Park. Allenrolfea occidentalis Shrubland was identified from one relevé on the upper slope of a bajada in the northern wilderness, west of Black Forest, and also on an observation point on a saline overflow area along an intermittent wash flowing into Lithodendron Wash. Substrates were marine shales such as Chinle. Environmental summary: Globally. This shrubland association occurs across arid and semi-arid portions of the western U.S. at elevations ranging from near sea level to 1680 m. Stands occur on the outer margins of broad intermittent floodplains and playas, or can form landscape mosaics with other saline communities in saline marshes or gypsum-influenced habitats. Bare soil covers most of the unvegetated surface, and there is very little litter. Soils are fine-textured and derived from alluvium. Petrified Forest National Park. This association occurred at 1680 m (5500 ft) elevation. The slope was minimal (1%). USFWS wetland system: Not applicable. Vegetation description: Globally. Allenrolfea occidentalis dominates the shrub layer, but the cover is often quite low, ranging from 20% to less than 1%. Most stands have barren playa forb understories, but grasses, including Leymus cinereus, Distichlis spicata (= ssp. stricta), Sporobolus airoides, and Sporobolus wrightii, and succulent forbs, such as Suaeda suffrutescens var. detonsa, Salicornia spp., and Nitrophila spp., are occasionally found. Most stands occur either in a shrubland matrix dominated by Sarcobatus vermiculatus or Atriplex canescens, or in small stands; either Sarcobatus vermiculatus or Atriplex canescens can occur throughout these small stand communities. In the southern extent of its range, scattered Isocoma drummondii, Iva acerosa, or Prosopis glandulosa may be present. Exotic species, such as occasional Tamarix spp., Bromus tectorum, or Salsola tragus, may occur in this community. C15
Vegetation Classification and Distribution Mapping Report: Petrified Forest National Park Petrified Forest National Park. Only one relevé was classified as Allenrolfea occidentalis Shrubland, with total vegetation cover of 19%. The vegetation cover consisted of a shrub stratum with 14% cover and an herbaceous stratum with 5% cover. This relevé had a species diversity of 16 species. The vegetation in the shrub layer was dominated by Allenrolfea occidentalis, with 6% cover, and the herbaceous layer was dominated by Sporobolus airoides, with 5% cover. Most abundant species: Stratum Global species PEFO species Short.shrub/ Allenrolfea occidentalis Allenrolfea occidentalis sapling Herb.(field) N/A Sporobolus airoides Other noteworthy species: Global species Data are not available. PEFO species Data are not available. References: Bourgeron and Engelking 1994, Driscoll et al. 1984, Griffths 1902, Kagan et al. 2000, Muldavin et al. 2000b, NVNHP 2003, ORNHP unpubl. data, Western Ecology Working Group n.d. C16
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National Park Service U.S. Departme
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Vegetation Classification and Distr
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The National Park Service, Natural
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Acronyms and Abbreviations AA ac AP
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Executive Summary The classificatio
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Acknowledgments Behind the authors
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Axis 3 Axis 2 Vegetation Classifica
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20 Table 5. continued Plant communi
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Appendix D Plant species list The s
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D3 Appendix D continued Scientific
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Appendix E Plant community and map
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Appendix E: Plant community and map
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Appendix F Plant community and map
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F3 Appendix F continued Plant commu
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Appendix F continued Plant communit
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G4 B1 Cottonwood / Rubber Rabbitbru
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G6 B3 Blue Sage Dwarf-Shrubland Fig
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G8 B5 Copperweed - Alkali Sacaton S
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G10 B7 Drummond Goldenweed - Gallet
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G12 B9 Greasewood / New Mexico Salt
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G14 B11 Iodine Bush Shrubland Figur
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G16 B13 Sandsage Colorado Plateau S
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G18 B15 Tamarisk Shrubland Figure.G
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G20 B17 Winter-fat / Blue Grama Dwa
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G22 B19 Alkali Sacaton - Blue Grama
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G24 B21 Blue Grama Herbaceous Veget
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G26 B23 Galleta - Alkali Sacaton He
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G28 B25 New Mexico Saltbush / Alkal
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G30 B27 Russian Thistle Sand Dune V
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G32 B29 Arizona Siltbush Sparse Veg
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G34 B31 Slender Buckwheat Sparse Ve
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G36 B33 Airstrip Figure.G65..Photos
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G38 B35 Barren Wash Figure.G68..Gro
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G40 B37 Park Sites Figure.G71..Phot
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G42 B39 Residences Figure.G73..Phot
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G44 B41 Run-off Control Feature Fig
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G46 B43 Stock Ponds Figure.G77..Pho
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G48 B45 Vegetated Wash Complex Figu
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Appendix H: Accuracy Assessment Dat
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Table H-4. Contingency table: Manag
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The Department of the Interior prot
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Vegetation Classification and Mapping Project Report - USGS

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