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sampling design. Table 2.4-37 presents a summary of sample adequacy for <br />each vegetation type. <br />nmin 2(sz)2 <br />(d x)2 <br />Ylhere: nmin Minimum number of samples required <br />a = Sample standard deviation <br />z = The z statistic 0.84 for shrublands sad <br />1.28 for grasslands and all cover samples <br />d Amount of reduction desired to detect = 0.1 <br />x = Sample mean. <br />EVALUATION OF DIVERSITY - MOFFAT AREA <br />Herbaceous diversity values were obtained by using a species composition <br />approach. All herbacious plants are ranked by relative cover. <br />~ S ecies Cover <br />Relative Cover = Total Plant Cover <br />This ranking determines the relative importance of each species. Four <br />percent relative cover is used as the relative importance cut off value for <br />each species. Any species with at least 4;6 relative cover is considered to <br />contribute a significant amount to diversity. All herbaceous plants greater <br />than or equal to 4~ relative cover are broken down into life form (forbs, <br />grasses or grass like), seasonality (warm or cool season) life cycle (annual <br />or perennial) and origin (native or introduced). At least five species <br />should comprise the combined relative importance. However, the total <br />combined important species Should not exceed 75R in combined relative cover. <br />Since mining in the Moffat Area will mainly disturb txo plant <br />communities, only the Sagebrush/Snowberry and Mountain Shrub communities were <br /> <br />Revised 11/84 2.4-11 <br />