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Table 2.3-21. Diversity I~rx (H') for Shrubs in Range Site C Based on the Shanrom-Weirer Index a`d <br />• Calculated From 1980 X St® Densities. (1)(2) <br />X Stan (3)(4) -(Pilogpi) X100 <br />Species Densi[y(Ni) Pi -(Pilogpi) H' <br />Amelanchier alnifoiia .26 .0506 .0656 15.88 <br />Artemisia canes .007 .0014 .04+'.0 .97 <br />Artemisia tridentate 3.05 .5937 .1344 32.53* <br />Cercocanpus ledifolius .O1 .0019 .0052 1.26 <br />Chrysothamnnis viscidiflorus .06 .0117 .0226 5.47 <br />Pachistima mvrsinites .03 .0058 .0130 3.15 <br />Purshia tridentate .02 .0039 .0094 2.28 <br />Symphoricarpos oreophilus 1.70 .3309 .1589 38.47* <br /> <br />Total Comron spp. 8 nr-5.137 .4131 100.01 <br />* Plant species providing 71% of the total diversity (H') for shrubby species. <br />• (1) Shannom-Weirer (Weaver) Index <br />H' _ -~pi • logpi (Pielou, 1966) <br />where: pi = Ni/N <br />Ni = IYm;nance m=anure ~ stem density). <br />N =The sun of all soecies dominarce measure. <br />(2) Many diversity indices are available and [he above example should rot be considered as the final <br />choice W b? used in establishing a vegetative standard. <br />(3) X stem densities are based on [ransect means, see text. <br />(4) Expressal as stags per square meter. <br />s <br />2-114 <br />~~ <br />