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• Section 816.111 (a) Continued. <br />are predominantly rangeland followed by pastureland with some minor <br />acreage of cropland. After disturbance the intent is to reestablish <br />these premining land uses. <br />If a diverse, effective and permanent vegetative cover of the same <br />seasonal variety native to the area is to be reestablished in the <br />permit area as described in Table 43, Comparison of Species Diversity <br />by Year Sampled in Range Transects, a different seed mixture must be <br />used where different postmining land uses are proposed. The rangeland, <br />pastureland and cropland areas will receive the appropriate mixtures <br />described in Section 780.18. A summary of each of the proposed seed <br />mixtures is set forth below. <br />Rangeland Mixture <br />• As demonstrated in Table 96, Proposed Rangeland Seed Mixture, 29 <br /> species are selected for seeding where rangeland is to be the <br /> postmining land use. The mixture is comprised of 20 native species and <br /> 9 introduced species, and on a seed density basis 86.6 percent are <br /> native species. The need for such diversity is dictated by: the <br /> variable range of edaphic microsites to be encountered on topsoiled <br /> revegetated areas; and the desires to provide a more balanced level of <br /> nourishment, to prolong the season when succulent forage is available, <br /> to produce better overall ground cover and forage production, and to <br /> furnish food and cover for a wider range of animal species. The <br /> adaptation to the proposed land use of each seed species contained in <br /> the mixture has been widely documented as more fully explained in <br /> Section 816.112 (a). All of the selected species are common to all of <br /> the vegetation types described in Section 779.19. Different mixtures <br /> will not be planted on each slope, aspect or site because natural <br /> selection will determine which of the species will predominate in a <br /> particular microclimate. The permanency of the introduced species of <br />• the proposed seed mixture is also well documented. Vallentine (1971) <br />- reports that productive <br />816-138 Revised 04/10/87 <br />