Vegetation Classification and Mapping Project Report - USGS

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Appendix C: Global and local plant community descriptions C.4 Herbaceous C.4.11. Sporobolus airoides Southern Plains Herbaceous Vegetation Base map class NatureServe common name NatureServe code Alkali.Sacaton.Herbaceous.Vegetation Alkali.Sacaton.Southern.Plains.Herbaceous.Vegetation,.Alkali. Sacaton.Southern.Plains.Grassland CEGL001685 Summary: This alkali sacaton mesic grassland community is found in the southwestern Great Plains, on the Colorado Plateau, in the southwestern United States, and adjacent Mexico. Stands occur on slightly to moderately saline, nearly level bottomlands and terraces. Additional moisture from washes and sheetflow runoff are important for most stands. Substrates are shallow, moderately well- to poorly drained, silty clay soils formed in alluvium. The community is dominated by medium-tall and short grasses. Sporobolus airoides is a dominant, often accompanied by Symphyotrichum subulatum (= Aster subulatus), Pascopyrum smithii, Buchloe dactyloides, Distichlis spicata, Hordeum jubatum, and Bouteloua gracilis. Scattered shrubs, such as Atriplex spp. or Sarcobatus vermiculatus, may be present. Forb cover is also minor. Classification confidence: 3 - Weak. Classification comments: Globally. Compare this association with Sporobolus airoides - Bouteloua gracilis Herbaceous Vegetation (CEGL001686) and Pleuraphis jamesii - Sporobolus airoides Herbaceous Vegetation (CEGL001778). Stands in Montana are placed with Sporobolus airoides Northern Plains Herbaceous Vegetation (CEGL002274), which occurs in the northwestern Great Plains, and this type is restricted to the southwestern Great Plains and southwestern United States. In the southeastern Plains see Distichlis spicata - (Hordeum jubatum, Poa arida, Sporobolus airoides) Herbaceous Vegetation (CEGL002042). Petrified Forest National Park. Data are not available. Vegetation hierarchy: Physiognomic class V Herbaceous.Vegetation Physiognomic subclass V.A. Perennial.graminoid.vegetation Physiognomic group V.A.5. Temperate.or.subpolar.grassland Physiognomic subgroup V.A.5.N. Natural/Semi-natural.temperate.or.subpolar.grassland Formation name V.A.5.N.d. Medium-tall.bunch.temperate.or.subpolar.grassland Alliance name Sporobolus airoides.Herbaceous.Alliance.(A.1267),.Alkali. Sacaton.Herbaceous.Alliance Ecological systems placement: Ecological system unique ID CES304.781 CES304.775 CES304.787 Ecological system name Inter-Mountain.Basins.Wash Inter-Mountain.Basins.Active.and.Stabilized.Dune Inter-Mountain.Basins.Semi-Desert.Grassland C91
Vegetation Classification and Distribution Mapping Report: Petrified Forest National Park NatureServe conservation status: Global rank. G3Q (9-Apr-1998). The number of occurrences is unknown. The community is reported from Arizona, Colorado (S3), Kansas, New Mexico (S2), Texas, Utah, and Mexico and may occur in California. The community is found on slight to moderately saline, nearly level bottomland and terraces with alluvial silty clay soils. Distribution: Globally. This alkali sacaton mesic grassland community is found in the southwestern Great Plains, Colorado Plateau, and elsewhere in the southwestern United States and Mexico, ranging from Kansas and Colorado south to Texas, New Mexico and west to Arizona, Utah, and possibly California. Petrified Forest National Park. Sporobolus airoides Southern Plains Herbaceous Vegetation was identified from two relevés within Petrified Forest National Park. They were located in a drainage channel and on a sand dune/sandsheet. These two relevés were sampled east of Lithodendron Wash and west of Lacey Point and east of Newspaper Rock and east of the main park road. Environmental summary: Globally. This grassland community occurs on alluvial toeslopes and flats, terraces, floodplain depressions, and sandy streambanks and washes in bottomlands throughout the southern Great Plains and Colorado Plateau. Additional moisture from washes and sheetflow runoff are important for most stands. Elevations range from below 1000 m (3050 ft) to over 2000 m (6100 ft). Sites are typically flat to gently sloping but may be as steep as 30% slope. Soils are shallow to moderately deep, moderately well- to poorly drained, alkaline, and often saline with sandy, silty or clay soils (Francis 1986, Johnston 1987, Kittel et al. 1999a, Lauver et al. 1999, Von Loh et al. 2002). Other parent materials include lavaflow, cinders, relict Pleistocene river cobbles, and sandstone. Petrified Forest National Park. This association was sampled at 1640 and 1650 m (5360-5400 ft) elevation. Both stands had no slope. USFWS wetland system: Not applicable. Vegetation description: Globally. This association is characterized by a sparse to moderately dense (15-75% cover), medium-tall graminoid layer dominated by Sporobolus airoides. Associated species include Achnatherum hymenoides, Symphyotrichum subulatum (= Aster subulatus), Buchloe dactyloides, Distichlis spicata, Hordeum jubatum, Bouteloua gracilis, Panicum obtusum, Pleuraphis jamesii, Sphaeralcea spp., Sporobolus cryptandrus, and Pascopyrum smithii (Francis 1986, Johnston 1987, Kittel et al. 1999a, Lauver et al. 1999, Von Loh et al. 2002). Scattered shrubs may be present, such as Atriplex canescens, Atriplex confertifolia, Ephedra spp., Ericameria nauseosa, Gutierrezia sarothrae, or Sarcobatus vermiculatus. Total shrub cover is low (
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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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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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