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• 2.5.3 Collection end Analysis of Production Data <br />Circular plots one meter square in Brea were used for production <br />estimates. The current year's growth of all herbaceous plants was clipped. <br />AEI graminoids were cut end sorted by individual species while fortis were <br />combined into a single category. Each production plot yielded one composite <br />sample. <br />In the laboratory, clippings were oven dried et 105oC for 24 <br />hours end weighed to the nearest tenth of a gram. Data were recorded as <br />grams per square meter (g/m21 end converted to pounds per acre flblacl <br />using the multiplier of B.91. Statistical adequacy requirements for <br />production were calculated using the OSM formula above, except that mean <br />production was used in place of mean cover. <br />2.6 Plant Species Collection end Identification <br />Plant species were collected throughout the 1980 growing season. <br />Species were identified by field ecologists conducting the study and <br />confirmed by Dr. William A. Weber, Curator of the Herbarium, University <br />of Colorado. Taxonomic nomenclature follows Weber end Johnston (19791. <br />Weber 11976), Nickerson et al. (1976), USDA 11979), USFS (1976), end <br />• Beetle !19701 were consulted in en attempt to apply the most widely utilized <br />common names. The presence or absence of primary selenium indicators <br />ere in accordance with WDEQ Guideline No. 2 ns revised March 1979. Noxious <br />weed designators follow Thornton et el. 119741. Statements of origin or <br />provenance follow Weber and Johnston (19791 end other sources. Voucher <br />specimens have been preserved in a reference collection. <br />2.7 Species Diversity Calculations <br />Species diversity (richness) indices for each affected and reference <br />community were determined with the formula <br />species diversity = s/log N, <br />where S equals the number of species in a sample end N equals the total <br />number of individuals Itransectsl in a sample (Whittaker 19751. Equit_ <br />abi{ity indices were determined for each community using the formula <br />_~ ( N ~ l og (N ~ , <br />where ni equals the cover value for each species encountered in a community <br />end N equals the total vegetation cover in a community. <br />• <br />-5- <br />