Laserfiche WebLink
• to quantify species diversity in terzas of the number of perennial herbaceous <br />species per minimal area. Our species-area curve xas developed from the <br />frequency of perennial herbaceous species on the Valent Sand subsite, The <br />sample included 200 placements of c one-square-foot quadrat. We calculated <br />the apparent density of each species by the equation <br />d ~ -loge (q~100), <br />where d is density and q is 100 minus the frequency percentage (Table 2). <br />Next we calculated the area per individual of each species and recorded <br />the number of species in each successively larger area. The species-area <br />curve (Figure 1) was derived from numbers in columns four and five of Table 2. <br />The "minimal area" derived from the species-area curve is defined as the <br />point at which a 10 percent increment of area will yield information about <br />a 10 percent increment of species. Thus, the "minimal area" tangent is <br />• drawn parallel to a line drawn from zero to the 10-percent coordinate at <br />3.1 species and 20 square feet. Our minimal area. and proposed plot size <br />for measuring species diversity, is 16 square feet. <br />B,5.4. Sample size <br />Aa for sandsage density, xe shall cover the area to be mined according to <br />the general sampling procedure, and shall obtain a minimum of 15 plots. <br />B.5.5. Statistical calculations <br />Statistical values for each subsite will be reported on the data form of <br />Table 1, and these data will be used to establish a success standard <br />according to the weighted-average procedure of 4.15.7(4)(b), <br />B.6. Cover. Productivity and Botanical Composition <br />B.6.1. Purpose and time of sampling <br />Cover, productivity and botanical composition of perennial herbaceous species <br />. on the area to be mined will be used to establish comparability of the two <br />6 <br />