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Production <br />Alfalfa averaged 1,582.7 pounds of biomass production per acre (Table 11). Together, all <br />other species averaged 1,984.2 pounds per acre. Total biomass production averaged 3,567 <br />pounds per acre. <br />Shrub density averaged 356.1 individuals per acre (Table 12). Nearly two-thirds of these <br />were big sagebrush, but mountain snowberry was also important. Saskatoon serviceberry, <br />rubber rabbitbrush, chokecherry, and Wood's rose contributed minor amounts to total shrub <br />density. <br />1991 Wadge Pasture (Photographs 18 through 20) <br />Cover <br />Introduced perennial cool season grasses, the dominant lifetorm in this reclamation unit, <br />contributed 38.9 percent of total vegetation cover (Table 13). More than four-fifths of this <br />percentage was provided by intermediate wheatgrass, but smooth brome was also important. <br />Desert wheatgrass, orchard grass, meadow brome, and Russian wildrye also contributed minor <br />amounts to this lifeform's measured total vegetation cover percentage. Redtop and timothy were <br />also present. Native perennial cool season grasses accounted for 14.0 percent of total vegetation <br />cover. Agassiz bluegrass contributed more than one-quarter of this percentage. Together, <br />sheep fescue, basin wildrye, western wheatgrass, and Canada bluegrass contributed half of this <br />lifeform's total vegetation cover. Oniongrass, mountain brome, Montana wheatgrass, thickspike <br />wheatgrass, bluebunch wheatgrass, Nelson needlegrass, and green needlegrass also contributed <br />measurably to total vegetation cover. Slender wheatgrass, big bluegrass, and beardless <br />bluebunch wheatgrass were also present. <br />Introduced perennial forbs provided 25.2 percent of total vegetation cover. Alfalfa accounted <br />for nearly three-fourths of this percentage. Cicer milkvetch contributed the remaining <br />quarter. Canada thistle and common dandelion were also present. Native perennial forbs were <br />the most diverse lifetorm and accounted for 6.2 percent of total vegetation cover. James <br />starwort was responsible for more than half of this percentage. Western yarrow, goosegrass <br />(Galium ap~rine), white-flower peavine, Palmer penstemon, Rocky Mountain penstemon, and <br />American vetch also contributed measurably to total vegetation cover. Other species present <br /> <br />16 <br />