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The maximum required number of samples (50) vas taken on [he affected area • and 1 more than the maximum required vas taken on the reference area. Productivity on the pinyon-~unlper type la quite low overall (25-33 lbe/acre, Table 3.4) and is highly variable from site to site vi thin this vegetation type. Even the use of large plats did not reduce the sample to sample variability enough to provide adequate data with a reasonable number of sample points. bimin for the tree density vas 80.8; the maximum required number (SOj of smmples were taken. The t-test comparisons (n - .OS) of the reference and affected cover and productivity data indicated that the areas were equivalent and the reference area selected (Hap 1) is suitable. 3.3 COVEA DATA Mean vegetation cover for the pirryon-juniper affected area vas 17.8 percent (Table 3.2). Shrubs, sub-shrubs and trees provided most of the vegetative cover (43.3x and 41.6X of total vegetative cover, respectively). • Vegetation cover oa the affected area vas predominately Pirws edulis and uercue gambelii. Grasses and (orbs provided 1.9 percent and 0.8 percent of the total cover, respectively (Table 3.2). Bare ground vas 61.8 percent and litter-rock accounted for 20.4 percent of the total cover on the affected area (Table 3.2). The species diversity index vas 2.3715 (Table 3.2). Cover data for the reference area vas similar [o that of the affected area. Mean vegetation cover for the reference area vas 19.1 percent (Table 3.3). The reference area vas dominated by trees and shrubs and sub-shrubs which contributed 48.42 and 40.Lx of the total vegetation cover, respec- tively. Plnus edulis and ercue &ambelli provided the most of the vegeta- tion cover nn the reference area. Grasses (1.0 percent) and forts (0.9 percent) were minor components of [he total cover. ..Bare ground on the reference area vas 63.4 percent and litter-rock vas 17.5 percent. The epe- ciee diversity index ves 2.0842 (Table 3.3). •