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• <br />ERO Resources <br />Vegetation types dominated by big sagebrush and greasewood occur along <br />stream courses and adjacent terraces. The occurrence of this vegetation <br />type is controlled by soil type and soil moisture. Soils underlying the <br />big sagebrush-greasewood type are deep and sandy to loamy in texture <br />(Table 4). This characteristic, coupled with the moderate moisture supply <br />at depth during parts of the year and the higher salt concentrations favor <br />both codominant species. This type occurs on 5.1 acres of the total <br />affected acreage (Table 5). <br />Mean ground cover values for this vegetation type are lichens and mosses - <br />1.5%, litter - 61.8%, rock - 2.1%, soil - 23.7% and wood 12% SFigure 4, <br />Table 6). The litter component of the ground cover values is significant <br />• in its high values as compared with other stands and because it controls <br />the salt concentration at the surface. The salt content of the greasewood <br />leaves that make up a large part of the litter component effectively limit <br />growth in the herb layer. <br />• <br />The herb layer is relatively well developed when compared with the rest of <br />the permit area. Mean herb cover is 10.2% and is second to the western <br />wheatgrass type in total herb cover. Perennial forbs dominate this type <br />with a mean cover value of 4.3%. Grasses of importance to this type with <br />their corresponding mean values include quackgrass (Agropes on t ens) - <br />2,8%, cheatgrass - 1.0%, saltgrass Wistichlis s.ri- a) - 1.3%, western <br />wheatgrass - 0.1% and needle -and -thread grass (0.1%. Annual forbs of <br />importance include pigweed iChen000dium fremontii) - 0.5% and peppergrass <br />- C0.1% (Figure 4, Table 6). <br />The shrub layer is dominated by big sagebrush and rabbitbrush. Mean shrub <br />cover for these two species are 12.6% and 9.0%, respectively. Total mean <br />II.F-49 <br />