Vegetation Classification and Mapping Project Report - USGS

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Appendix C: Global and local plant community descriptions Most abundant species: Stratum Global species PEFO species Tree.canopy Populus fremontii Populus fremontii Tall/short.shrub/ Atriplex canescens, Ericameria Ericameria nauseosa sapling nauseosa, Artemisia tridentata ssp. tridentata Herb.(field) Artemisia campestris, Achnatherum N/A hymenoides Other noteworthy species: Global species Bromus tectorum, Tamarix chinensis PEFO species Data are not available. References: Western Ecology Working Group n.d. C13
Vegetation Classification and Distribution Mapping Report: Petrified Forest National Park C.3 Shrubland C.3.1. Allenrolfea occidentalis Shrubland Base map class NatureServe common name NatureServe code Iodine.Bush.Shrubland Iodinebush.Shrubland CEGL000988 Summary: This is a sparsely vegetated shrubland found on seasonally wet, alkaline playas, intermittent floodplains, or along washes in saline overflow areas below 1680 m (5500 ft) elevation. The dominant species, and playa communities in general, are widely distributed throughout the Intermountain West, ranging from southeastern Oregon south to Texas. These shrublands or barrens are flat to extremely low-gradient, almost always in desert ecosystems with less than 18 cm (7 inches) of rain per year, and usually in areas with very poor drainage that flood during rare rainstorms. Playas and washes dominated by Allenrolfea occidentalis generally appear to be small, rare, and poorly understood throughout their range. Allenrolfea occidentalis dominates the shrub layer, but 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 in a matrix of Sarcobatus vermiculatus- or Atriplex canescensdominated shrublands, and in small stands, either Sarcobatus vermiculatus or Atriplex canescens can occur throughout the community. Classification confidence: 2-Moderate Classification comments: Globally. This appears to be a distinct, widespread type. With additional studies throughout the range of this habitat, it is possible that the type may be split into a number of geographic communities based on associated forbs. However, current data indicate the type is very similar throughout at least the northern half of its range, where it occurs in a matrix composed largely of Sarcobatus vermiculatus salt desert scrub. In the southern part of its range, where it is slightly more common, it occurs in a matrix of Larrea tridentata or Ambrosia dumosa. This is a broadly defined type that may need to be subdivided by characteristics of the understory. Muldavin et al. (2000b) classified five different plant associations in the Tulerosa Basin in southern New Mexico. Petrified Forest National Park. This association had higher herbaceous cover than shrub cover. However, since only one relevé of this vegetation community was sampled, and the existing Allenrolfea occidentalis Shrubland already occurred in the NatureServe database, the relevé was retained under this association classification. If additional data are collected and the continual high herbaceous cover is sampled, than this association may need to be reclassified as a shrub herbaceous vegetation community. Vegetation hierarchy: Physiognomic class III. Shrubland Physiognomic subclass III.A Evergreen.shrubland Physiognomic group III.A.5 Extremely.xeromorphic.evergreen.shrubland. Physiognomic subgroup III.A.5.N Natural/Semi-natural.extremely.xeromorphic.evergreen. shrubland Formation name III.A.5.N.b Facultatively.deciduous.extremely.xeromorphic.subdesert. shrubland Alliance name Allenrolfea occidentalis Shrubland.Alliance.(A.866),. Iodinebush.Shrubland.Alliance C14
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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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Page 75 and 76: Literature Cited ties: Terrestrial
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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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