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density distribution by lifeform of the reclamation vegetation to that of the reference areas. Because the <br />average internal resemblance (i.e. between- sample similarity) of applicable reference areas for species <br />density data is often in the range of 70 %, the standard is 63% (0.9 x 70 %). (The assessment of internal <br />similarity was performed on data from the extended reference areas) <br />The Motyka similarity index is used as follows: <br />IS = 2c / (a + b) <br />Where <br />c = the smaller of the paired species density values (for each lifeform) of the reclaimed and <br />reference areas* <br />a = total of species density values for lifeforms of the reclaimed areas <br />b = total of species density values for the lifeforms of the reference area* <br />* Weighted average lifeform species density using the Sage Creek Reference Areas (weighted based on <br />83% original extent of Mountain Brush and 17% original extent of Sagebrush). <br />Only values for species density by vascular plants are included. Lifeforms used include: <br />Annual /biennial forbs <br />Annual grasses <br />Perennial forbs <br />Perennial cool season grasses <br />If the index of similarity between the species density within the specified lifeforms of the reclaimed and <br />reference areas exceeds 63 %, then Test C is passed. <br />Alternative Test D): Native Species Presence Assessment <br />The third alternative assessment of the species diversity of reclaimed lands makes direct reference to the <br />presence of native western North American plant species in reclaimed areas. <br />Total cumulative # of native species* _> avg. reference area native species density (# species / 100 <br />sq.m.) <br />9 <br />