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4 - 72 <br />r~ <br />U <br />The density of trees is lower in the reference area (81 per acre) than the affected area (189 <br />per acre}. The reference area has a greater variety of shrubs; however, total shrub densities <br />area lower shrub density in the reference area is due primarily to the absence of mountain <br />pepperweed. See Tables 4.5-22, 4.5.11, 4.5.23, and 4.5.12. <br />Species richness is lower in the reference area (ndex = 7.65) primarily because of a lower <br />number of fort species. Equitability of cover is also lower (ndex = 0.51) as this community has <br />two major dominants: Utah juniper and Salina wildrye. See Table 4.5.5. <br />Section 4.5.17, Summary, provides additional summary data for samples parameters <br /> <br />• <br />(cover, production, and density) of the affected and reference areas. <br />4.5.13 SAMPLE CHARACTERISTICS AND ADEQUACY <br />Table 4.5.24 provides data on the adequacy of cover, production, and density (both shrub <br />and tree) sampling for each affected and reference area and illustrates the comparability of each <br />reference area to the affected area vegetation type. A statistically adequate number of samples <br />was taken for cover, production, and density in all affected and reference areas. Furthermore, <br />all reference areas are statistically comparable with respect to cover data. The Shadscale <br />Shrubland reference is also comparable for production data. The slightly higher production of <br />the Greasewood Shrubland and Juniper Woodland reference areas results in their being slightly <br />unrepresentative. <br />Mo <br />Volume 1 <br />4-29-96 <br />