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Table 2.3-20. Diversity Index (H') for Herbaceous Plant Species on Rage Site C Based on the Shannon <br />Weiner Index and Calculated From 1980 Cover Data. (1)(2) <br />-(Pilogpi) X100 <br />Species Cover Hits Pi-(Pilogpi) H' <br />Achillea lanulosa <br />3 <br />.0612 <br />.0743 <br />8.26* <br />Agropyran smithii <br />8 <br />.1633 <br />.1285 <br />14.29* <br />Agropyron spicatum <br />4 <br />.0816 <br />.0888 <br />9.88* <br />Agropyron trachvcaulan <br />2 <br />.0408 <br />.0567 <br />6.31 <br />Allium cernuman <br />1 <br />.0204 <br />.0345 <br />3.84 <br />Bramus inermis <br />8 <br />.1633 <br />.1285 <br />14.29* <br />Comandra umbellata <br />2 <br />.0(08 <br />.0567 <br />6.31* <br />Erioguman spaerocephalum <br />1 <br />.0204 <br />.0345 <br />3.84 <br />Haplopappus acaulis <br />2(3) <br />- <br />- <br />- <br />Kochia scoparia <br />4(3) <br />- <br />- <br />- <br />Koeleria cristata <br />1 <br />.0204 <br />.0345 <br />.3.84 <br />Lupinus spp. <br />19(3) <br />- <br />- <br />- <br />Poa pratensis <br />16 <br />.3265 <br />.1587 <br />17.65* <br />Salsola kali <br />7(3) <br />- <br />- <br />- <br />Sitanion hystrix <br />3(3) <br />- <br />- <br />- <br />Stipa coma[a <br />1 <br />.0204 <br />.0345 <br />3.84 <br />Vicia americana <br />1 <br />.0204 <br />.0345 <br />3.84 <br />�rlmvvn (orbs <br />1 <br />.0204 <br />.0345 <br />3.84 <br />Total common species = 18 <br />N=49 <br />.8992 <br />100.03 <br />* Comprise >70% of the herbaceous species diversity. <br />(1) Shannon -Weiner (Weaver) Index <br />H' = .<pi• logpi (Pielou, 1966) <br />where: pi = Ni/N <br />Ni = Dominance measure (cover) <br />N = The same of all species dominance measure. <br />(2) Many diversity indices are available and the above example should not be considered as the final <br />choice to be used in establishing a vegetative standard. <br />(3) IhdesirabLe plant species (annual, or poisonous to livestock), not included in calculating H'. <br />• <br />2-113 <br />