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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 /> l Smo = 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 />