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Lorenciro Cam~on Mint -Veneration Technical ReDOrt <br />• Shrub density for this study area was calculated to be 97.14 woody stems per hectare. Winterfat <br />and natrowleaf cottonwood seedlings dominated the woody stem count. Production in the surface <br />mine study area totaled 175.13 pounds per acre. <br />• <br /> <br />Oak/Pinyon Pine Disturbed Area <br />Oak/pinyon pine communities were encountered within the proposed surface mine area, the Rl/R2 <br />portals, Portal P1, and the R3/R4 portals. Dominant perennial grasses included narrow-leaved <br />sedge (Carex stenoph~~lla), big bluestem, and blue grama at 2.2, 2.4, and 2.1 percent, <br />respectively. The common perennial forb was cudweed sagewort. Sleepy catchfly was the <br />dominant annual forb. Gambel oak accounted for 12.2 percent of the vegetative cover within the <br />oak/pinyon community. Litter was high, comprising 42.4 percent of the cover in any one transect. <br />Rock and bare ground were low. These study areas met the 90 percent confidence parameter for <br />cover when compared to the reference area. Thus, the null hypothesis was accepted. Table V-7 <br />summarizes the oak/pinyon raw quantitative data from Tables V-8 to V-11. <br />TABLE V-7 <br />LORENCITO CANYON MINE <br />OAK/PINYON STATISTICAL AREA COMPARISON STUDENT t-TEST <br /> Reference Area Oak /Pinyon Disturbed Area Oak/Pinyon <br />Mean Basal Cover 34.10 35.70 <br />Sample Variance 6.10 8.41 <br /># of Sample Points 15.00 30.00 <br />Calculated t Table Value 1.83 <br />Student t Table Value 2.05 <br /> Null h othes is is acce ted <br />Mean Shrub Density 285.97 197.40 <br />Sample Variance 5346.53 2106.81 <br /># of Sample Points 30.00 43.00 <br />Calculated t Table Value 6.36 <br />Student t Table Value 2.09 <br /> Null h othes is is re'ected <br />Mean Protection (grams) 7.15 7.09 <br />Sample Variance 2.79 2.69 <br /># of Sample Points 20.00 29.00 <br />Calculated t Table Value 0.12 <br />Student t Table Value 2.05 <br /> Null h thes is is acce ted <br />`/cg.476/December 9. 1996 13 <br />