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ERO Resources <br />• <br />i. BI, SAGEARIK?i~RE.e- <br />I1) location a~ Distribution: <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 coil 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 S.1 acres of the total <br />affected acreage (Table S). <br />12) Structure and Comnesition: <br />Mean ground cover values for this vegetation type are lichens and mosses - <br />l.Sk, litter - 61.8X, rock - 2.1k, soil - 23.7k and wood 1ZX iFigurv 4, <br />Table 61. 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 cortyared with the rest of <br />the permit area. Mean herb cover is 10.2k 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 4.3X, Grasses of importance to this type xith <br />their corresponding mean values include quackgrass 1({yroo,~ on t snsl - <br />2,8X, cheatgrass - 1.Ok, saltgrass IDistichlis s.ri- of - 1.3X, xestern <br />xheatgrass - O.lk and needle-and-thread grass (0.]k. Annual forbs of <br />importance include ptgwsed i~enooodium fremontii) - O.Sk and peppergrass <br />- CO.lk (Figure 4, Table 6). <br />The shrub Layer is dominated by big sagebrush and rabbitbrush. Mean shrub <br />cover for these two species are 12.6X and 9.0X, respectively. Total mean <br />II.F-49 <br />