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Agric., Division of Plant Industry, Title 35, Article 5.5, 101-119, Lists A and B of Rules as replaced <br />2003). <br />Species Diversity <br />Species diversity suitable to support the approved post-mining land uses of rangeland and wildlife <br />habitat will be judged using the following four tests; success would be demonstrated by passing <br />the first (A) and at least two of the remaining three (B, C, and D). <br />Mandatory Test A): No Overwhelming Dominant <br />No single plant species may exceed 60% relative cover. <br />Alternative Test B): Total Species Density Test <br />It is proposed that this overall reclamation diversity standard be judged based on the species <br />density values observed along with cover sampling in 100 sq.m. sample plots. It is further <br />proposed that the species density numbers be subjected to sample adequacy assessment in the <br />usual manner. <br />For purpose of establishing the range of species density within the reference areas, the 75% <br />range of variation would be established as: <br />zxs <br />Where: <br />z =the number of standard deviations (both ways from the mean) encompassing 75% of <br />the normal distribution (= 1.15; see Rohlf and Sokal 1969, Table P) <br />s = standard deviation (n-1) <br />The standard would be the point at which the central 75% of the distribution of overall species <br />density in the reference areas begins. Mathematically this would be: <br />Mean reference area species density (no. of species per 100 sq.m.) - 1.15 s <br />The standard is be based on a weighted average as done with cover and production. <br />In words, the selected standard is the midpoint (in terms of probability distribution) of the lower <br />hail of the range of variation of the reference areas. <br />I• s <br />