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4 ~ 58 <br />• 4.5.6.4 PLANT SPECIES COLLECTION AND IDENTIFICATION <br />Plant species were collected throughout the 1980 growing season. Species were identified <br />by field ecologists conducting the study and confirmed by Dr. William A Weber, Curator of <br />Herbarium, University of Colorado. Taxonomic nomenclature follows Weber and Johnston <br />(1979). Weber (1976), Nickerson et al. (1976), and Beetle (1970) were consulted in an <br />attempt to apply the most widely utilized common names. Primary selenium indicators are in <br />accordance with WDEQ Guideline No. 2 as revised March 1979. <br />Noxious weed designators follow Thorton et al. (1974). Statements of origin or provenance <br />follow Weber and Johnston (1979) and other sources. Voucher specimens have been preserved <br />in a reference collection. <br />Species richness indices for each affected and reference community were determined with <br />the formula: <br />species richness = s/log N, <br />• where S equals the number of species in a sample and N equals the total number of individuals <br />(transects) in a sample (Whittaker 1975). Equitability indices were determined for each <br />community using the formula: <br />where n ~ equals the cover value for each species encountered in a community and N equals the <br />total vegetation cover in a community. <br />4.5.7 TIME OF SAMPLING <br />Vegetation cover data was collected in July 1980, production plots clipped in July and <br />August 1980, and density data collected in July, August, and September 1980. <br />• <br />NF Volume 1 4~29~96 <br />