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• Black greasewood with an average height of 116.5 cm was the <br />tallest shrub. Rubber rabbitbrush had an average height of 88.3 cm. See <br />Table 4. <br />Tree Data <br />A total of 9 cottonwood trees were present within the southern <br />portion of the study area. They ranged in height from 3 m to 20 m and had <br />a DBFi range of 5 cm to 88 cm. There were 10 stumps of variable size and <br />no new reproduction. See Table 5. <br />3.2.2 Shadscale Shrubland Study Area <br />This study area is located in the central portion of Section <br />26, T105, R98W east and south of the Roadside Mine. The approximately <br />24 acre site is shaped like two intersecting rectangles. The topography <br />has steep slopes to the west and north and ranges in elevation from 4800 <br />feet to 5400 feet. <br />This Shadscale Shrubland will be used to establish reclamation <br />standards for the Roadside Mine.disturbances and part of the refuse disposal <br />area. <br />Cover <br />• Totat vegetation cover in the Shadscale Shrubland averages <br />38.4 percent. Rock cover is very high at 30.7 percent while soil and <br />litter cover are both moderate at 14.1 percent and 16.8 percent, respec- <br />tively. Absolute cover by life farm is as follows: trees; 0.7 percent; shrubs, <br />5.9 percent; perennial grasses, 1.3 percent; annual grasses, 27.4 percent; <br />perennial fortis, 0.7 percent; annual (orbs, 2.6 percent; and cryptogams, <br />0.3 percent. See Table 6. <br />Shrubs provide just over 15 percent of the vegetation cover in this study <br />~ area. Shadscale is followed in dominance (4.Z percent cover) by obovate- <br />leaf saltbush A.t2ip(ex cf. vbvvvta and spiny horsebrush ie.ticadymi¢ ~pi~v~a. <br />Cheatgrass, a weedy annual with a cover of 27.4 percent, accounts for 71 <br />percent of the total vegetation cover. Galleta is an important native <br />perennial grass with a cover of 0.7 percent. Two annual introduced weedy <br />plants, redstem filaree ficvdium ciCU#vaium and tumblemustard, represent <br />the major forb cover. Numerous other species present within the Shadscale <br />Shrubland but having a low cover are listed in Table 6. <br />l <br />Production <br />The herbaceous production of fifty 1 m2 plots ranged from a <br />low of 3.3 g/m2 to a high of 45.3 g/m2 but averaged 18.4 g/m2 or 164.4 <br />._ Ibs/ac. Cheatgrass accounted for 65 percent of the total production. <br />Perennial grasses important in the production data include Salina wildrye <br />. Ei~mu~ ~o,L(rcu~ and galleta. Fortis had a total production of 4.7 g/m2. <br />~ See Table 7. <br />-9- <br />a <br />