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RULE 2 PERMITS <br />Information pertaining to statistical tests to be performed for determination of revegetation success <br />is contained in Section 4.15. <br />Woody plant density, by species, for the sagebrush, mountain shrub, and aspen communities is <br />shown on Table 2.04.10-6, Woody Plant Density: <br />Following is a general description of each of the vegetation communities, including various <br />environmental factors contributing to the distribution of the types. The relationships between soil <br />particle size versus soil moisture and their combined effect on vegetation community distribution <br />is illustrated on Figure 2.04.10-1, Environmental Gradient/Plant Tolerance Graph. <br />Sagebrush Community <br />The sagebrush community is characterized by almost complete dominance of the overstory by big <br />sagebrush (Artemisia tridentatel), and snowberry (Symphoricarpos oreophilus), at a density of <br />2,739 and 1,822 plants per acre, respectively. The measurement of snowberry density is a very <br />subjective measurement whereby large clumps of the species make actual measurement of <br />individual plants along the transect very difficult. Therefore, the given density value is, at best, an <br />approximation of actual density but still provides an indication of relative abundance in the overall <br />vegetative community. For additional woody plant density values by species refer to Table <br />2.04.10-6, Woody Plant Density. <br />The growth form of the community is characterized by scattered shrubs of low to medium height, <br />rarely exceeding four feet. Numerous areas of. open ground exist with various grasses and forbs <br />comprising the understory. The most abundant grasses are western wheatgrass (Agropyron <br />smithii), Kentucky Bluegrass (Poa pratensis), mountain brome (Bromus marginatus), and green <br />needlegrass (Stipa viridula). The most abundant forbs are lupine (Lupinus caudatus), wild onion <br />(Allium spp.), arrowleaf balsamroot (Balsamorhiza sagittata), and yarrow (Achillea lanulosa). <br />During 1980 and 1989 the total herbaceous cover was determined to be 30.9% and 39.71% <br />respectively. For details on cover of individual species refer to Table 2.04.10-2, 1980 Herbaceous <br />Cover by Species and Table 2.04.10-3, 1988 Herbaceous Cover by Species. <br />During 1980 and 1988, total herbaceous production for the sagebrush community was determined <br />to be 436.1 and 825 pounds per acre respectively. According to these production figures, the <br />carrying capacity in animal unit months (AUMs) , assuming 1,000 pounds of air dry forage per <br />AUM at 50% utilization, would be from 0.22 to .41 AUMs per acre. Based on the determination <br />by the Bureau of Land Management of an average production of 0.14 AUMs per acre for the <br />sagebrush type in this area, it is evident that the condition of the sagebrush community with the <br />permit area is good. Grazing has not occurred from the initial lease area since 1977. Grazing on <br />the permit area addition should be discontinued in 1991 with the construction of wire livestock <br />fencing. <br />The sagebrush community is found throughout the permit area on all elevations, slopes and soils. <br />On portions of the permit area where soil moisture retention and soil depth become limiting to the <br />other vegetation communities, the sagebrush community develops. Snowberry will occur in greater <br />numbers within the community where moisture retention is favorable. <br />Rule 2 Permits 2.04.10-2 Revision Date: 7/23/18 <br />Revision No.: TR -123 <br />