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Mountain Brush (MB) reference mean species density (omitting the noxious <br />weeds): 31.5 species per 100 sq.m. <br />mean-1.15*s=31.5-1.15(7.1)=23.3 <br />Sagebrush/Snowberry (SB) reference mean species density (omitting the <br />noxious weeds): 30.0 species per 100 sq.m. <br />mean - 1.15*s = 30.0 -1.15 (3.0) = 26.7 <br />90% of the area-weighted reference area mean species density is calculated as <br />follows: <br />0.9*[(0.83*MB)+(0.17*SB)] = 0.9((0.83*23.3)+(0.17*26.7)]=21.5 species <br />per 100 sq. m. <br />Mean total species density in BRB-2 = 18.5 species per 100 sq.m. <br />t-calculation: <br />t~ _ (18.5-22.3) / (4.9/20) _ -0.8/1.63 = -3.468 <br />Critical t (a= 0.1) _ +1.328 <br />Since tc is greater than critical t, Alternative Test B is failed for BRB-2. <br />With regard to Alternative Test C, the similarity index between the lifeform species <br />density values for the prescribed lifeforms for BRB-2 and the Mountain Brush Reference <br />Area data was as follows: <br />Soecies Density <br />Lifeform BRB2 MB Ave <br />AnnuaV Biennial Fortis 6.2 4.0 <br />Annual Grasses 0.5 0.2 <br />Perennial Fortis 6.4 16.0 <br />Perennial Cool Season Grasses 3.8 6.6 <br />ISmoM6 = ((4.0+0.2+6.4+3.8)*2) / (6.2+4.0+0.5+0.2+6.4+16.0+3.8+6.6) = 67.3% <br />The similarity index between the lifeform species density values for the prescribed <br />lifeforms for BRB-2 and the Sagebrush/Snowberry Reference Area data was as follows: <br />• 21 <br />