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• by 2.5 cros covered by toliage of herbaceous species. The biomass was <br />measured in grams of dry matter per meter square plot. Density was the num- <br />ber of woody plants per plot, 10 meters by 10 meters or 100 square meters per <br />plat. Along with these parameters are shown the percent reliability that can <br />be measured as change trom the respective parameter means. Only one parameter <br />exceeded 10% of a 20 percent probability level but when whole numbers are <br />rounded off it was considered to be only 10 percent (aspen, cluster number <br />22). <br />The actual calculation of variances followed the standard <br />procedure using the formula: <br />sZ - EXZ - EX /n <br />n-1 <br />and the percent change from the refelrence mean, (X1 ^'X 2 ) 100, that <br />X <br />can be detected with a probability of 20 percent was determined by the <br />• following calculation: <br />100 <br />where s2 is the varian <br />• <br />xl - x2 ) <br />~ t20 2s in (100) <br />1 <br />xl <br />ce for the original sample mean, xl. <br />II.J-18 <br />12 /R7 <br />