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2.3.3.2 Cover <br />In 1979, cover for all range sites (A, B and C) was sampled by lifeform (Table <br />2.3-13). The 1979 cover data indicates that in range site A shrubs provided <br />64.5% of the aerial cover, herbaceous vegetation provided 23.0% with the remain- <br />ing cover being provided by litter and rock. In range site B, 45% of the aerial <br />cover was from shrubs and 22.0% by [he herbaceous fraction of the range site. <br />Again, rock and litter provided the remaining cover. The third range site, (C), <br />shrubs provided 35.9% of the aerial cover and the herbaceous fraction contributed <br />23.6%. <br />In 1980, the total aerial cover provided by herbaceous lifeform was 34.8%, 40.7% <br />and 19.8% in the A, B, and C range sites respectively (Table 2.3-14). The dif- <br />ference between 1979 range site B herbaceous cover of 22.0% and 1980 range site B <br />herbaceous cover of 40.7% is due to differences in sampling intensity between <br />1979 and 1980. In 1979, total aerial cover from all lifeforms was measured. <br />Based on statistical analysis for measuring total cover, only five [ransects were <br />needed in 1979 for range site B. In 1980, statistical analysis determined that <br />41 cover transects were required to measure herbaceous cover. Therefore, the <br />1980 data is a better expression of the actual cover provided by herbaceous vege- <br />tation on range site B. <br />2.3.3.3 Shrub Densit <br />Shrub density estimates are based solely on data collected in 1980. Table 2.3-9 <br />in Section 2.3.2 provides overall stem density by range site. Table 2.3-15 <br />expresses the mean stem density by species by range site. The sum of the means <br />in Table 2.3-15 will no[ give the overall stem density found in Table 2.3-9 due <br />to rounding off and differences in methods of calculation. <br /> <br />2-101 <br />