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z z <br />Sp2 = <br />table t([ ) value 95X confidence, two tailed value with (n, + n,)-2 degrees of freedom. <br />t 1 t <br />H Reference area cover equals affected area cover. <br />0 <br />Source: CMLRD document Guidelines for Compliance with Land Use and Vegetation <br />Requirements of the Colorado Mined Land Reelametion Board for Coel Nfning <br />(October 1988). <br />Motyka and others' version of Sorensen's Similarity Index: <br />IS = 2 MY <br />MO <br />NA + NB <br />where: <br />MY = Sum of the smaller importance values of the species or life-forms common to <br /> both areas <br />NA = The sum of the importance values of alt species or life forms in one area • <br />MB = The sum of the importance values of ell species or life forms in the other <br /> area <br />IS Similarity Index <br />Np <br />The value of the index ranges from 0 to 1, w(th t being complete similarity. An ibex of <br />.80 or greeter is an acceptable level of similarity. <br />Source: Chambers, J.C. end R.Y. Brown. 1983. Measuring Species Diversity on Reveg crated <br />Surface Mines: An Evaluation of Techniques. USDA•USFS Research Paper INT-322. <br />APSEN <br />Affected area samples: 1A, 3A, 4A, 6A, 7A, 8A, 9A, 11A, 12A, 13A. Reference area <br />samples: 2A, SA, 50A, 14A, 15A. <br />t-test results: <br />x = 92.8 x 88.4 t = 1.57 <br />j i c <br />n, = 5 n, = 10 tt = 2.160 accept No • <br />S} = 25.2 S} = 26.5 <br />J i <br />22-1-2 Revised 03/01/95 <br />