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Alternative Test C): Species Density Distribution Assessment Among Lifeforms <br />This test relates to the distribution of species presence among the various lifeforms in comparison to the <br />reference areas. This standard uses the Motyka similarity index to assess the resemblance of species <br />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 <br />(a + b) <br />Where: <br />c = the smaller of the paired species density values (for each lifeform) of the <br />reclaimed 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 Yoast Extended Reference Areas (weighted <br />based on 24.4% original extent of Aspen, 48.9% original extent of Mountain Brush, 24% original extent of <br />Sagebrush and 2.7% original extent of Steep Mountain Brush). <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 />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 />9 <br />