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3123044 
Technical Report 
North American deserts 
Allen, EB; Geiser, LH 
2011 
U.S. Department of Agriculture, Forest Service, Northern Research Station 
Newtown Square, PA 
NRS-80 
Assessment of Nitrogen Deposition Effects and Empirical Critical Loads of Nitrogen for Ecoregions of the United States 
133-142 
English 
is part of a larger document 2804014 Assessment of nitrogen deposition effects and empirical critical loads of nitrogen for ecoregions of the United States
North American deserts and semi-deserts extend from British Columbia to Mexico (CEC 1997). The ecoregion description is adapted from CEC (1997). They are characterized by aridity (130 to 380 mm annual precipitation); shrub and succulent vegetation with trees in riparian areas and higher elevation woodlands; and dry, low organic matter soils that are high in calcium carbonate (CaCO3) in some regions. The ecoregion can be subdivided into cold northern deserts and semideserts (Columbia Plateau, Snake River Basin, Great Basin, greater Colorado Plateau) and warm southern deserts (Mojave, Sonoran, Chihuahuan) (see Table 12.1). 
Driscoll, C. T. 
NAAQS
• ISA NOxSOxPM Ecology (2018)
     Cited in First Draft
          Appendix C: Case Studies
               California
• ISA NOxSOxPM Ecology (2020- Final Project Page)
     Cited
          Appendix 16
               16.6 Southern California