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 CES304.775 CES304.787 Ecological system name Inter-Mountain.Basins.Active.and.Stabilized.Dune Inter-Mountain.Basins.Semi-Desert.Grassland NatureServe conservation status: Distribution: Global rank. GNR (26-Jul-2001). Globally. The association is found on terraces of large rivers in the Colorado Plateau and Uinta Basin and likely occurs elsewhere in the southwestern U.S. Petrified Forest National Park. Sporobolus cryptandrus Great Basin Herbaceous Vegetation was sampled from just one relevé. It occurred on a sand dune/sandsheet located just east of the NPS boundary in the central neck of Petrified Forest National Park, south of the railroad tracks and north of the Puerco River. Environmental summary: Globally. This grassland is described from the Uinta Basin and Colorado Plateau where it occurs on alluvial terraces of large rivers, sandy upper stream terraces along intermittent washes, and on sand deposits on mesas and plains. Elevation ranges from 1226-1630 m. Sites are flat to gently sloping valley bottoms, plains or plateaus. Soils are loamy sands and sandy loams derived from alluvium, eolian deposits, or sandstone residuum. Biological soil crusts are generally present and may provide up to 30% cover. Stands have generally been disturbed by flooding, shifting sands, livestock grazing, or human recreation. Petrified Forest National Park. This association occurred at an elevation of 1630 m (5350 ft) with no slope. USFWS wetland system: Not applicable. Vegetation description: Globally. This plant association is found on alluvial terraces of large rivers and on sand deposits on mesas and plains. The sparse to moderately dense (10-30% cover) herbaceous layer is characterized by the dominance of the warm-season perennial graminoid Sporobolus cryptandrus. Hesperostipa comata (= Stipa comata), Pleuraphis jamesii, Sporobolus contractus, Sporobolus giganteus, or Equisetum variegatum may occur in low abundance. Low cover of native forbs, such as Abronia fragrans, Chamaesyce fendleri, Plantago patagonica, Sphaeralcea grossulariifolia, Sphaeralcea parvifolia, or the succulent Opuntia polyacantha may be present. The widespread introduced annual grass Bromus tectorum and several other exotic species such as Bromus rigidus, Salsola kali, Helianthus annuus, Sisymbrium altissimum, or Tribulus terrestris may be present to abundant, especially on disturbed riparian stands. An occasional Brickellia spp. or other shrubs may occur, but they are not dense enough to form a shrub layer. Moss is important in some stands. Petrified Forest National Park. Only one relevé was classified as Sporobolus cryptandrus Great Basin Herbaceous Vegetation, with total vegetation cover of 73% consisting of low cover of shrubs (3%) and high herbaceous cover (70%). The species diversity was low with 7 species. The vegetation in the herbaceous layer was almost solely dominated by Sporobolus cryptandrus with 70% cover. C97
Vegetation Classification and Distribution Mapping Report: Petrified Forest National Park Most abundant species: Stratum Global species PEFO species Herb.(field) Sporobolus cryptandrus Sporobolus cryptandrus Other noteworthy species: Global species Bromus tectorum PEFO species Data are not available. References: Cogan et al. 2004, Cowardin et al. 1979, USFS 1937, Von Loh et al. 2002, Western Ecology Working Group n.d. C98
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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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40 Table 13. Base map class summary
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46 Table 16. Summary statistics for
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56 Table 22. Summary statistics for
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Literature Cited ties: Terrestrial
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B2 Appendix B Plant Community 2003
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B4 Appendix B .continued Plant Comm
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Appendix C: Global and local plant
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Page 208 and 209: Appendix D Plant species list The s
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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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