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ERO Resources <br />value. Grasses important to the sagebrush-wheatgracs 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 spades of varying importance include fleabane - 1.6 g/m2, <br />globemallow - O.B g/m2 and Utah sweetvetoh - 0.7 g/m2. The only <br />half-shrub of significance is snakeweed at a mean production of 0.90 <br />g/m2 (Figure 5, Table 9). <br />13) +~~ -cession and a~ e; <br />The big sagebrush-wheatgrass communities occurring on the permit area are <br />disclimax stands produced ac 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 conaiderabl• 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 errvironmental factors, principally soils. <br />These features and the way in vMich they interrelate have previously been <br />described in terms of the overall vegetation mosaio and its internal <br />ordinations or gradients. To clarify the dynamics of the large and <br />important sagebrush-wheatgrasa 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 IC) OR TYPE OF INCLUSION II) <br />Sagebrush-Colorado Wildrye IC) <br />Colorado Wildrye II) <br />Rabbitbrush (I) <br />• <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 />II.F-36 <br />