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ABSTRACTomy (Soil Survey Staff, 1999) includes six taxonomic categories (in decreasing rank): order, suborder, greatIn this paper, we report the taxonomic structure, the spatial distrigroup, subgroup, family, and series. Today, U.S. Soil bution, and relative abundance of soils in the USA. In the analysis, Taxonomy is the most widely used system of soil classifiwe used the STATSGO (1997 version) database, which contains inforcation worldwide (Yaalon, 1995(Yaalon, , 1996Malcolm et al., mation on 11 orders, 52 suborders, 232 great groups, 1175 subgroups, 6226 families, and 13 129 series. The analysis of taxonomic structure 2000, p. E117-135).showed that the numbers of taxa in any category were distributedDespite the wide acceptance of the system as a means tion planning.

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