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Above ground standing biomass of herbaceous species (production) was <br />determined as the mean dry weight of all species at all plots within each <br />• <br />inventory area, and expressed in gm/m2 and lbs/acre. Shrub and tree density <br />values were computed as the mean number of plants per 50m2 or 25m2 and per <br />acre for all species. <br />Species diversity was obtained using cover data in a Shannon-Wiener <br />index. Species diversity values were computed based upon cover data. The <br />total number of species (N) observed in the plots was tallied. The Shannon- <br />Wiener index of diversity (H') was calculated for each vegetation type by: <br />H' _ -~pi 'log pi <br />where H' =index of species diversity <br />S =number of species <br />pi = is the proportion of cover of the ith species <br />• in the sample. <br />The range of the index is from 0 to logs. <br />The evenness component was determined for each vegetation type by: <br />H' <br />E =Hmax <br />where E = equitability (range 0-1) <br />H' =observed species diversity <br />Hmax = maximum species diversity = logs <br />Sample adequacy for all data was computed following Snedecor and Cochran, 1967 <br />as <br />t2s2 <br />m= 2 <br />D <br />• <br />-4- <br />