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• reclaimed areas. The number of species is high because of an <br />increased number of annual and perennial fortis growing in the 1982 <br />areas. <br />Alfalfa was the number one ranking species in the areas seeded <br />in 1982 (8.1 percent cover; 84 percent frequency). Other top-ranking <br />species included timothy (2.6 percent cover; 72 percent frequency), <br />smooth brome (2.9 percent cover; 48 percent frequency), slender <br />wheatgrass (1.5 percent cover; 76 percent frequency), and orchard <br />grass (1.2 percent cover; 64 percent frequency). Introduced <br />perennial grasses accounted for 33.2 percent of the total species <br />cover, and native cool season perennial grasses accounted for 21.6 <br />percent of the total (Table 35). The percent of native perennial <br />grasses was higher than on any of the other reclaimed areas. Total <br />• vegetation cover was 23.6 percent (slightly less than either of the <br />native reference areas), and bare soil cover was 10.5 percent. The <br />amount of bare soil was higher than for areas seeded prior to 1982 <br />and is probably related to the reduced amount of alfalfa present in <br />the 1982 areas. Litter from alfalfa provides a substantial amount of <br />mulch which covers the soil surface. Species density was 13.1 <br />species per square meter. <br />Total production for the areas seeded in 1982 was 209.3 g/m2 <br />(Table 36). Alfalfa accounted for 27.3 percent of the total <br />production, introduced perennial grasses accounted fot 41.7 percent, <br />and native cool season perennial grasses accounted for 21.4 percent. <br />Major species included timothy, intermediate wheatgrass, and slender <br />wheatgrass. Total production in the 1982 areas was approximately <br />. twice the herbaceous production of the reference areas. <br />81 <br />