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WkINIMM <br /> in-LL-Rnouncwn.%oiL, <br /> Statistical Treatment. Analyses of variance were performed by computer at <br /> Colorado State University. Sources of variance include years, soil depths, and <br /> years x soil depth for cover, production and percent bare ground. Results are <br /> shown in Table 5. <br /> M. Results <br /> Statistically significant differences in cover and production were found between <br /> years and soil depths. Year x depth interaction for production was significant at <br /> the 0.05 level of confidence but not at the 0.01 level (see Table 5). <br /> Species composition appears to be similar for 1977 and 1978, but differs consider- <br /> ably for 1979 and for 1980. The latter two years show considerably more <br /> orchardgrass than the first two years. The 1980 terrace also shows an increase in <br /> relative cover of native species compared to the previous years (see Table 3). <br /> In most cases, production is lower on shallow sampling sites than on deep. The 1980 <br /> terrace is an exception to this trend. Vegetative cover for all years is less on <br /> shallow sites compared to deep sites. Bare ground, rock and litter are higher on <br /> shallow sites. <br /> The vegetation baseline inventory conducted in 1979 and 1980 identified three <br /> vegetation communities: aspen woodland, aspen shrubland, and spruce/fir parkland. <br /> Cover and production figures for these native communities are compared to <br /> averages for the reclaimed waste dump area in Table 6. Vegetative production on <br /> the reclaimed portions of the waste dump averaged over all years and soil depths <br /> exceeds production of all three plant communities and reference areas as measured <br /> in the baseline inventory. If tree cover is excluded from the baseline inventory <br /> data, vegetative cover on the reclaimed area exceeds cover for all communities <br /> and reference areas measured in the baseline inventory except for the aspen <br /> shrubland reference area. Cover for deep sites averaged over all years essentially <br /> matched the highest cover value reported in the baseline inventory (74% vs. 75% <br /> for the aspen shrubland reference area), if tree cover is not counted. <br /> 5 <br />