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aspects in the study area except for the drier slopes in the southwestern <br />section of the study area. It was the mast diverse vegetation type studied <br />during a 1979 vegetation survey (Mariah Associates, 1980) with 38 different • <br />species encountered in Dover quadrats and a species diversity index of 2.72. <br />The type is characterized by the presence of five shrub species, Utah <br />servio-berry (Amelanchier utahensis), oomron chokecherry (Pnmus virginiana), <br />Gatnbel oak (Quercus li) and Basin big sagebrush (Artemisia tridentata) <br />distributed in a mughly~lumped fashion throughout wntinuous stands of <br />mountain snowbe.Lxy (Symphoricaxpos oreophilus). Aspen stands were inter- <br />mingled within the type along draws and other areas of high soil moisture at <br />the upper elevations of the study site. Con[[Dn understory species include <br />Kentucky bluegrass (POa pratensis), slender wheatgrass (Agropyron trachycaulum), <br />common yarrow (AChillea millefolium), and nettleleaf gianthyssop stache <br />urticifolia). <br />The total 1979 percent vegetative basal Dover on the mixed brush site was <br />15.98 and was dominated by the grass and forb strata (7.2 and 5.8$, <br />respectively) as cz~mpared to 2.88 for shrubs (Mariah Associates, 1960). <br />The mixed brush vegetation type was the frost productive type studied with a <br />dry weight production of 1818.9 1bs/acre in 1979. Most of the production <br />was contributed by shrubs (75.30 . Sr'^ub heights at these sites averaged <br />178.3 can (Mariah Associates, 1960). <br />Mixed brush tyae/aspen subtype. This type comprised 111.8 acres or 4~ of <br />the total lands on the study area. Most of the type is located along south <br />and east facing draws at the Up~p elevations. The type is characterized by <br />dense stands of aspen averaging 594.5 trees/acre with a shrub understory <br />occnprised mainly of mountain SRGWberty, CQ[IIDn chokecherry and Gaml7el oak <br />(Mariah Associates, 1980). The herbaceous understory is dominated by <br />ca~mon yarrow, nettleleaf gianthyssop, and Kentucky bluegrass. <br />Tree basal area averaged 219 cin2 (.24 sq. ft,) throughout all the stands <br />sampled. The largest tree sampled had a basal area of 2884 cin and diameter <br />breast high Cdbh) = 60.6 an. <br />• <br />-20- <br />