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• The Motyka similarity index is used as follows: <br />ISR,.=2c /(a+b) <br />Where <br />c = the smaller of the paired species density values (for each lifeform) of the reclaimed <br />and 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 Seneca II Reference Areas (weighted <br />based on 83% original extent of Mountain Brush / Aspen and 17% original extent of Sagebrush). <br />Only 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 />0 <br />If the index of similarity between the species density within the specified lifeforms of the reclaimed <br />and reference areas exceeds 63%, then Test C is passed. <br />Alternative Test D): Assessment of the Presence of Native Species <br />The third alternative assessment of the species diversity of reclaimed lands makes direct <br />reference to the presence of native western North American plant species in reclaimed areas. <br />Total cumulative # of native species* > avg. reference area native species density (# <br />species / 100 sq.m.) <br />*in the adequate sample of the reclaimed area and including alfalfa and / or cicer <br />milkvetch which have often been included in seed mixes as nitrogen -fixers in light of the lack of <br />suitable and available native nitrogen-fixers. <br />If the total cumulative number of native species in the reclamation sampling exceeds the average <br />number of native species per 100 sq.m. in the weighted average of the reference area sampling, <br />then Test D is passed. <br />• 7