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• Information in Table 9 shows information used to compare cover, biomass and <br />woody Nlant density for the three vegetation types inventoried on the mine <br />lease. In this case the "t" values are calculated for each parameter for each <br />of the two reference areas in each of the vegetation types. Of the "t" values <br />calculated, rive may be considered somewhat high. Three of these are for den- <br />sity of woody species, which are highly variable in both the mountain brush <br />and sagebrush communities. However, sampliny was adequate to determine dif- <br />ferences in the means considerably less than 10 percent in each case (see <br />Tables 4 and 13). Had the number of samples been fewer and variances larger <br />(but still within the 10 percent of ~ at 0.20 probability), the "t" values <br />would have been smaller. Therefore, it is Celt that since the "t" values, for <br />the most part, are small, the reference areas are indeed comparable to the <br />inventoried areas on the mine lease. <br />In addition, similarity indices have been calculated comparing the reference <br />areas to the inventory areas for each community. The results are given in <br />Table 10. For comparisons of this type, a similarity index greater than 0.5 <br />• is considered relatively indicative of "similarity". The similarity index is <br />calculated as follows: <br />2W <br />S = a + b where <br />S = similarity index <br />b = number of species in the reference area <br />a = number of species in the inventoried area <br />W = number of species in common. <br />The actual data for each sample plot in each reference area is presented in <br />Tables 10, 11 and 12 for aspen, mountain brush, and sagebrush respectively. <br />This data included the parameters of percent cover and biomass of herbaceous <br />species and density of woody plants. Percent cover and biomass were measured <br />from material in meter square plots. The cover was determined from cells 2.5 <br />• 12/87 II.1-17 <br />