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Where: H = Shannon Diversity Index <br />E _ "The Sum of" <br />n. = Importance Value for Each Component (species) <br />i <br />N = Total Importance Values <br />H xas divided by loges to produce a scaled value of 0 - 1. <br />S Number of Species <br />Table 2.4-45 presents a summary of diversity values for previously <br />disturbed areas. <br />Importance values (Pi) for species within each vegetation unit were <br />calculated according to the formula: <br />P1 = (Ni/N) <br />Where: Ni The importance measure for each species i <br />• N = The sum of all species importance measures <br />Since West Ridge vegetation represents a homogeneous man-made plant <br />community, it isn't necessary to,xeigh the Pi values xith vegetation <br />community acreages. <br />Determination of equality between reference (control) areas and their <br />corresponding vegetation units were evaluated by utilizing the procedures in: <br />"A Statistical Evaluation of Revegetation Success on Coal Lands in the West," <br />Office of'Surface Mining Technical Document, 19 pages, provided in Appendiz <br />2.4-A. This outlines the specific methods used - confidence limit approach. <br />Evaluation of cover data, Table 2.4-46, indicates that all reference <br />areas are equivalent to their corresponding vegetation units. <br />Evaluation of production data, Table 2.4-47, shoxs that of the five <br /> reference areas established, Sage/Snowberry and Mountain Shrub were <br /> equivalent. The Rothrock Sage, Subirrigated Shrub, and Terrace Sage <br />Revised 11/84 2.4-llb <br />