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• Sagebrush <br />Affected Area <br />A = <br />62 <br />5 <br /> . <br /> s = 7.6 <br /> Reference Area k = 65.7 <br /> s = B.5 <br /> t-test t - 1.0 <br /> c <br /> t - 2.05 <br /> t <br />Aspen <br /> Affected Area x = 89.1 <br /> s 5.6 <br /> Reference Area z = 89.9 <br /> s = 5.7 <br /> t-test t = 0.3 <br /> c <br /> t = 2.05 <br /> t <br /> Yestern Yheat9rass/Alkali Sagebrush <br /> Affected Area x = 5G.5 <br /> s = 12.4 <br /> Reference Area x 51.5 <br />• ? 1 <br />12 <br /> s . <br /> t-test t - 0.6 <br /> c <br /> t - 2.07 <br /> <br />Species Composition <br />The Notyka and others' version of Sorensen's index was used to calculate an index of <br />similarity for the affected and reference area within the four major vegetation types. <br />Mean cover by morphological class using [he data sets specified earlier provided [he basis <br />for the calculation. <br />Mixed Brush <br />M = 71.6 <br />w <br />M = 75.1 <br />A <br />M = 76.9 <br />R <br />IS - .94 <br />Mo <br />J <br />3 Revised 06/24/91 <br />