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were based upon the standard 27 pounds/day dry weight intake per animal unit. The rates <br />were expressed as available forage in animal unit months (AUMs). <br />Species Diversity. Qualitative assessments of species diversity (species richness, numbers, <br />and equity) were made on the basis of the cover and frequency data collected in the irrigated <br />pasture, Swale/drainage, and sagebrush vegetation types. Quantitative methods, including <br />diversity indices and rank correlation tests, were not applied because of the inherent <br />shortcomings associated with these techniques (Chambers 1983). Similarity coefficients were <br />not applied because of the inherent dissimilarity of the plant communities found on the study <br />site, and the fact that a reference area approach for determining revegetation success at the <br />New Horizon 2 area is not being proposed. <br />Results and Discussion - 1987 <br />Vegetation Distribution and Floristics - 1987. Vegetation types were determined on the <br />basis of plant composition and land use. Six vegetation types were recognized in the New <br />Horizon 2 baseline vegetation studies: sagebrush, Swale/drainage, irrigated pasture, irrigated <br />• hayland, irrigated cropland, and miscellaneous types. Farmsteads, facilities (corrals, <br />stockyards, haystacks), orchards, ponds, roads and other (abandoned cropland, abandoned <br />buildings, etc,), were included in the miscellaneous category. The distribution of each type is <br />shown on Map 2.04.10-1. The total acreage of each type in the study area and proposed <br />permit area is shown in Table 2.04.10-4. <br />The plant list resulting from the floristic surveys conducted with the study area is presented in <br />Peabody Appendix 10-1. The list is arranged in alphabetical order by plant morphological <br />class. Species are identified according to scientific name, common name, occurrence in the <br />various vegetation types, and native or introduced. The list includes 208 species of vascular <br />plants. The morphological classes represented by the most species in Peabody Appendix 10-1 <br />include perennial forbs (65), perennial graminoids (46) and annual forbs (37). <br />The search of the Colorado Natural Areas Inventory data base indicated that no data are <br />available for the locality in which the study area occurs. However, both the Colorado <br />Department of Natural Resources and the U.S. Fish and Wildlife Service indicated that Luoinus <br />• (REVISED 9/99) 2.04.10 - 25 <br />