Laserfiche WebLink
• Perennial forb cover is low, although many species occur in this <br />reference area. The more common species are toadflax penstemon (0.9 percent), <br />and hairy goldenaster 10.4 percent). Minor species include slimstem actinea, <br />pingue, and babywhite aster (Leuceleae ercico<de.~l. <br />Annual forb cover is low. The more common species are trailing <br />fleabane, Sawatch knotweed (%oLyg.onum nuwutchen~el, and rosy gilia fSi.l.Ia <br />aiauatal. <br />Succulent cover is sparse, consisting of plains pricklypear and <br />Whipple cholla. Other minor plant species are included in Table 19. <br />Production <br />Total production averages 33.7 g/2 m2, or 150.3 Ibs/acre. Perennial <br />graminoids account for about 52 percent (17.9 g/2 m21 of the total. Mutton <br />bluegrass is the major producer with 9.4 g/2 m Other important species <br />are, in descending importance, squirreltail, littleseed ricegrass, red threeawn, <br />Indian ricegrass, and prairie junegrass. Perennial forbs comprise about <br />38 percent (12.6 g/2 m l of total production. Cheatgrass, an introduced annual, <br />produces 2.0 g/2 m2. Native and introduced annual forbs produce 1.0 and <br />0.1 g/2 m2, respectively. Broom snakeweed, a sub shrub, produces 0.1 g/2 m2 <br />(Table 20I. <br />• Shrub Density and Height <br />Total shrub density averages 7.9 shrubs/50 m2 or abo~t 640 shrubs/ <br />acre. Gambel oak accounts for about 57 percent 14.5 shrubs/50 m 1 of total <br />shrubs. Other common species are, in descending importance, true mountain <br />mahogany, squaw-apple, and antelope bitterbrush (Table 21). <br />Average shrub height ranges from about 131 cm for squaw-apple <br />to 10 cm for Utah serviceberry. Gambel oak averages about 122 cm, true mountain <br />mahogany about 123 cm, and antelope bitterbrush averages 52 cm in height. <br />Tree Density <br />Total tree density in the Pinyon-Juniper Woodland reference area <br />averages 10.8 trees/250 m2 or about 174 trees/acre. Slightly more than half <br />of the total is accounted for by pinyon pine 15.5 trees/250 m21. Utah juniper <br />comprises 49 percent of the total, with 5.3 trees/250 m2 (Table 221. One <br />ponderosa pine is found in the reference area. Estimated tree heights range <br />from about 2 m to 9 m and average about 7 m. The ponderosa pine is much taller <br />with an estimated height of 16-18 m. <br />3.4 SHRUB PRODUCTION ESTIMATES <br /> Oven-dry weights of current year' s growth of the sampled shrubs are <br /> presented in Table 23. The regression equations and coefficients of determina- <br />• Lion are also shown in this table. Co efficients of determination were over <br />-16- <br />