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Table 2.3-21. Diversity Index (H') for Shrubs in Range Site C Based on the ShauDnrWeiner Index and <br />• Calculated From 1980 X Stem Densities. (1)(2) <br />X Sten (3)(4)-(Pilogpi) X100 <br />Species Density(Ni) Pi-(Pilogpi) H' <br />Amelanchier alnifoiia <br />.26 <br />.0506 <br />.0656 <br />15.88 <br />Artemisia canes <br />.007 <br />.0014 <br />.0040 <br />.97 <br />Artemisia tridentata <br />3.05 <br />.5937 <br />.1344 <br />32.53* <br />Cercocarpus ledifolius <br />.01 <br />.0019 <br />.0052 <br />1.26 <br />Chrysothamnws viscidiflorus <br />.06 <br />.0117 <br />.0226 <br />5.47 <br />Pachistima mvrsinites <br />.03 <br />.0058 <br />0130 <br />3.15 <br />Purshia tridentata <br />.02 <br />.0039 <br />.0094 <br />2.28 <br />Symphoricarpos oreophilus <br />1.70 <br />.3309 <br />.1589 <br />38.47* <br />Total Comron spp. 8 <br />nr-5.137 <br />.4131 <br />100.01 <br />* Plant species providing 71% of the total diversity (H') for shrubby species. <br />• (1) Shannonr-Weiner (Weaver) Index <br />H' = 4pi • logpi (Pielou, 1966) <br />where: pi = Ni/N <br />Ni = DYm;nance measure (X stem density). <br />N = The sun of all species dominance measure. <br />(2) Many diversity L --dices are available and the above example should not be considered as the final <br />choice to be used in establishing a vegetative standard. <br />MY stem densities are based on transect means, see text. <br />(4) Expressed as stems per square meter. <br />61 <br />2-114 <br />"17" <br />