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ERO Resources <br />value. Grasses important to the sagebrush-wheatgrass type with their <br />• corresponding mean production values are western wheatgrass - 5.4 g/m2. <br />Colorado wildrye - 3.7 g/m2, cheatgrass - 3.2 g/m2, Sandberg bluegrass <br />- 1.4 g/m2, Indian ricegrass - 0.4 g/m2 and galleta - 0.4 g/m2. <br />Forbaceous species of varying importance include fleabane - 1.6 g/m2, <br />globemallow - 0.0 g/m2 and Utah sweetvetch - 0.7 g/m2. The only <br />half -shrub of significance is snakeweed at a mean production of 0.90 <br />g/m2 IFigure 5. Table 9). <br />The big sagebrush-wheatgrass communities occurring on the permit area are <br />disclimax stands produced as a direct result of overgrazing by sheep and <br />an indirect result of the erosional events that are a secondary effect of <br />grazing and animal traffic pressures. There is considerable variation <br />within the type at various levels. The net result is a mosaic within a <br />mosaic with variation in like units of the patchwork. The effects of <br />grazing pressures are not equal throughout the type and are complicated by <br />• the influences exerted by other environmental factors, principally soils. <br />These features and the way in which they interrelate have previously been <br />described in terms of the overall vegetation mosaic and its internal <br />ordinations or gradients. To clarify the dynamics of the large and <br />important sagebrush-wheatgrass type further discussion is warranted. The <br />essential influences of soils and grazing -related disturbance on the <br />patchiness within the sagebrush-wheatgrass type can be partitioned as <br />follows: <br />CATEGORY (C) OR TYPE OF INCLUSION 11) <br />Sagebrush -Colorado Wildrye IC) <br />Colorado Wildrye II) <br />Rabbitbrush II) <br />• <br />II.F-36 <br />PREDOMINANT SOIL FACTOR <br />OR DISTURBANCE FACTOR <br />Moderately -Deep, Loamy <br />Shallow, Loamy, Extensive <br />Trampling <br />Moderately -Deep, Sandy <br />Eolian <br />