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Sagebrush <br />M = 60.6 • <br />w <br />M = 61.1 <br />A <br />M = 65.3 <br />R <br />IS - .96 <br />Mo <br />Aspen <br />M = 78.3 <br />w <br />M = 85.5 <br />A <br />M = 90.3 <br />R <br />IS - .89 <br />Mo <br />Yestern Yheatgrass/Alkali Sagebrush <br />M = 43.0 <br />w <br />M = 54.7 <br />A <br />M = 51.5 <br />R <br />IS - .81 <br />Mo <br />As can be seen from the above t-[es[ and similarity index summaries, the affected area and • <br />reference areas have a high degree of comparability. Production is not included because <br />the herbaceous component of total annual production alone is not an accurate measure to be <br />used in comparability evaluations. The density and cover of the woody dominated native <br />communities, particularly the mixed brush community, have a strong controlling influence <br />on the amount of herbaceous biomass produced annually. The amount of herbaceous <br />production at any sample point is controlled by the amount of overs[ory canopy present, <br />with some dense woody plots having little annual herbaceous production. The three <br />comparisons presenCed: cover, species density, and species composition, adequately <br />demonstrate comparability of the affected area and proposed extended reference area. <br />r <br />~_~ <br />4 Revised 06/24/91 <br />