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2 - <br /> species , or as litter, bare ground, or rock. Where shrubs <br /> were encountered, shrub canopy cover, as well as shrub <br /> ground cover, was measured by reference to the frame . Tree <br /> canopy cover was estimated by upward extension of the points . <br /> Transects were established until sample adequacy was attained <br /> by reference to the following formula : <br /> � a z <br /> nmin — (d x <br /> Where : nmin = minimum number of samples required <br /> a = sample standard deviation <br /> z = confidence level (t ) <br /> d = amount of reduction it is desired to detect <br /> x = sample mean <br /> Production Sampling <br /> Fifty quadrats , SO-cm x 50-cm = 4m2 were placed in <br /> each type randomly along the approximate centerlines. All <br /> herbaceous vegetation within each quadrat was clipped and <br /> separated by life-form: graminoids and forbs. Samples were <br /> air-dried for 10 days and subsequently weighed for the nearest <br /> 0 .1 g, using a metric balance. <br /> RESULTS <br /> Sampled areas are shown in Figs . 1-4 (Conifer-Shrub <br /> Type) , Figs. 5-8 (Oak-Shrub Type) , and Figs . 9-12 (Reference <br /> Area) . The reference area which was selected lies on a south- <br /> facing bench along the North Fork of the Purgatoire River. <br /> Cover data are presented in Appendices A-C, and <br /> are summarized in Table 1. Sample adequacy was attained in <br /> all types. <br /> Production data are presented in Appendices D-F and <br /> are summarized in Table 2 . Sample adequacy was attained in <br />