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Table 2.3-20. Diversity Ldex (H') for Herbaceous Plant Species m Rarge Si[e C Based on the Shanron <br />Weiner Icdex ~ Calculated Fran 1980 Corer Data. (1)(2) <br />-(Pilogpi) X100 <br />Species Cover Hits Pi -(Pilogpi) H' <br />Arhillea lanulosa 3 .0612 .0743 8.26* <br />Agropyran smith ii 8 .1633 .1285 14.29* <br />Agropyron spicatian 4 .0816 .088.9 9.88* <br />Agropyron trachvcaulum 2 .0408 .0567 6.31 <br />Alliun cernu~an 1 .0204 .0345 3.84 <br />Brcniis inennis ~. 8 .1633 .1285 14.29* <br />Comandra umbellata 2 .0408 .0567 6.31* <br />Eriogunian spaerocephalum 1 .0204 .0345 3.84 <br />Haplopappus acaulis 2(3) - - - <br />Kochia scoparia 4(3) - - - <br />Koeleria cristata 1 .0204 .0345 .3.84 <br />Lupinus spp. 19(3) - - - <br />Poa pratensis 16 .3265 .1587 17.65* <br />Salsola kali 7(3) - - - <br />Sitanion hystrix 3(31 - - - <br />Stipa crnia[a 1 .0204 .0345 3.84 <br />Vicia americans 1 .0204 .0345 3.84 <br />~ilmv.~n (orbs ~ 1 .0204 .0345 3.84 <br />Total camnn species = 18 N=49 .8992 100.03 <br />* Comprise >70Y, of the herbaceous species diversity. <br />(1) Shannon-Weirer (Weaver) Icdex <br />H' _ ~pi• logpi (Pielou, 1966) <br />where: pi = Ni/N <br />Ni = Daninance rmasure (cover) <br />N =The same of all species daninance measure. <br />(2) Many diversity i:dices are available acd the above example should rot be considerai as the final <br />choice to be used in establishing a vege[ative s[aidard. <br />(3) Ucdesirable plant species (annual, or poisonous to livestoclJ , not included in calculaticg H'. <br />• <br />2-113 <br />