Laserfiche WebLink
• (15.8 rover). The major contributors to perennial forb cover were mule's ear (Wvethia <br />amolexicaulis, 5.8~ cover), arrowleaf balsamrooi (4.0~ cover), end timber milkveich <br />( s r i s miser 1.6~ cover). Other frequently occurring perennial forbs includetl western <br />yarrow,tailcuplupine,endlanceleaffigwori(5croohularialanceolais). The Sagebrush <br />vegetation type has, over a long period, sustained more grazing pressure than arty of the other <br />vegetation types with the clear exception of the Meadow vegetation type. Consequently the <br />presence of annual and biennial forbs is slightly greater than negligible (2.0 ~ cover), <br />comprised mainly of thistles (mostly Cirsium coloradense, C. eatonii, and C. vul re) and <br />hound's tongue. <br />Perennial graminoid cover was dominated by Kentucky bluegrass (9.2~ cover), Agassiz <br />bluegrass (1.6~ cover), slender wheatgrass (1.4~ cover), blue wildrye (1.4`o cover), and <br />western wheatgrass (Agrooyron smithii, 1.0 ~ cover). <br />Herbaceous biomass production in the Sagebrush vegetation type (Table 15) averaged 124.4 gm <br />/ sq.m. (1 108 lb /acre). Of this amount, 71.7 qm / sq.m. came from perennial graminoid <br />• production, which in turn was mostly Kentucky bluegrass (43.4 gm / sq.m.). Other major <br />graminoid contributors included western wheaigress, bluebunch wheaigress,slender <br />wheatgrass, nodding and wooly brumes, end beardless wiidrye (Elvmus triticeides). Perennial <br />forbs wnsiituted 46.9 gm / sq.m. of production, major individual species components of which <br />were Lousiana sagewort (Artemisia ludoviciana), showy daisy, tailcup lupine, and mule's ear. <br />Annual and biennial forbs contributed 5.8 gm / sq.m. to the total production, most of which was <br />biennial thistles. <br />Taial shrub density in the Sagebrush vegetation type (Table 16) averaged157.9 stems / 50 sq.m. <br />(9686 stems /acre). The major contributors to this total were mountain snowberry (25.2 <br />stems / 50 sq.m. ),silver sa~brush (13.5 stems / 50 sq.m.), end big sagebrush (9.4 stems / <br />SO sq.m.). Other species wish more than negligible contributions included Saskatoon <br />serviceberry, mountain mahogany,Dougles rabbitbrush,andchokecherry. <br />3.1.6 MOUNTAIN BRUSH REFERENCE AREA <br />• Although the Seneca l l Mine Mountain Brush reference area (Figure 9) has mare total vegetation <br />cover (89.8 ~ cover) than the same vegetation type in the study area (74.0 ~ cover), the total <br />-19- <br />