Laserfiche WebLink
2.04.10 Vegetation Information <br />DENSITY <br />Total tree density is moderately dense (189 trees per acre). Utah juniper is the <br />most common tree with a density of 173 trees per acre. Pinyon pine is scattered <br />throughout the juniper (16 trees per acre). Trees occur more densely on north facing <br />slopes than west facing slopes. The average height and DBH for Utah juniper is 6 <br />meters and 27.7 centimeters, respectively. Pinyon pine average height is 6 meters with <br />an average DBH of 16.6 centimeters. See Table 4.5.12. <br />Average shrub density is 1,797 shrubs per acre in the Juniper Woodland sample area. <br />Mountain pepperweed, a subshrub, is the most common with 880 plants per <br />acre, followed by mountain mahogany with 696 shrubs per acre and Utah serviceberry <br />with 178 shrubs per acre. Average shrub height for all shrubs is 99.2 centimeters but <br />ranges from 13 to 600 centimeters. See Table 4.5-13. <br />RICHNESS AND EQUITABILITY <br />Species richness is highest of all vegetation types in the Juniper Woodland <br />(index = 15.37) because of the variable habitat conditions created by the wide range of <br />slopes and aspects. Equitability is fairly low (index = 0.80) because of the singular <br />dominance of Utah juniper. See Table 4.5-6. <br />PLANT SPECIES LIST <br />A total of 88 species of vascular plants was identified in the study area during the <br />1980 growing season. These 88 species encompass 29 families and 74 genera. Life <br />forms are represented as follows: 3 trees, 21 shrubs and subshrubs, 17 graminoids, 44 <br />forbs, and 3 succulents. The flora of the site is characterized by the presence of <br />numerous annual forbs, introduced annual grasses, a diversity of native deciduous <br />shrubs, and perennial, native, cool season mid -grasses with a bunch grass growth form. <br />See Table 4.5-14. <br />Twenty-one plant species or 24 percent of the total are introductions from outside <br />of the region. Introduced species consist of 1 shrub, 4 grasses, and 16 forbs. One <br />introduced forb, whitetop, is listed by Thornton et al. (1974) as being a prohibited <br />noxious weed, especially difficult to control. Whitetop occurred only in the Greasewood <br />Shrubland community with a low cover of 0.6 percent. Desert princes plume, <br />Stanleyapinnata, a native forb found scattered in the Juniper Woodland community, is <br />cited as being a primary selenium indicator by the Wyoming Department of <br />PR -02 2.04-65 10/12 <br />