2017-02-03_PERMIT FILE - C1980004 (2)

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2.04.10 Vegetation Information DENSITY Shadscale is the most abundant shrub in this vegetation type with a density of 1,790 shrubs per acre. Broom snakeweed is also common with 881 shrubs per acre. Total shrub density is 2,987 shrubs per acre. Average shrub height for all shrubs is 51 centimeters. See Table 4.5.9. RICHNESS AND EQUITABILITY Of the three vegetation types sampled, species richness is lowest in the Shadscale Shrubland (index = 11.90). This is probably related to the harsh environmental conditions existing on these steep slopes. Equitability is also relatively low (index = 0.73). See Table 4.5.6. JUNIPER WOODLAND Juniper Woodland occurs on the steep, north and west facing slopes and the ridgetops surrounding the McClane Mine. This vegetation type occurs mainly on the Torriorthent rock outcrop complex although there are inclusions of Havre loam, a deep, well drained soil. Juniper Woodland is the climatic climax for these environmental conditions. COVER This vegetation type contains 41 species of plants. These include: 2 trees, 12 shrubs and subshrubs, 11 graminoids, 14 forbs, and 2 succulents. Tree cover dominates with 26.0 percent cover. Total vegetation cover is 45.3 percent. Litter, soil, and rock are relatively abundant with 23.3, 17.0, and 14.5 percent cover, respectively. See Table 4.5.10. Utah juniper is the dominant tree species providing 20.8 percent cover. Pinyon pine Pinus edulis also common to a lesser degree (5.3 percent cover). Major graminoids in this woodland are: Salina wildrye (6.3 percent cover), Indian ricegrass (2.0 percent cover), and mutton -bluegrass, Poa fendleriana (2.0 percent cover). Minor grasses are cheatgrass and Sandberg bluegrass. Shrub cover is relatively sparse, but more common shrubs are mountain mahogany, Cerococarpus montanus (5.3 percent cover), and Gamble oak, Guercus PR -02 2.04-63 10/12