Laserfiche WebLink
than the control. In order of importance, north aspects performed <br />• better than south aspects; excelsior mulched plots were better than <br />unmulched plots; and 4:1 slopes performed better than 2:1 slopes. The <br />small differences in cover and production between 2:1 and 4:1 slopes on <br />the north aspect suggest that 2:1 slopes may be as easy to revegetate as <br />more gentle slopes as long as a north aspect is used. <br />3. Effects on plant growth when applying xeric and mesic mixtures <br />on topsoil versus ao topsoil treatment (Table 3.4-7). <br />Density on the refuse mesic plots was significantly lower than oa <br />the mesic topsoil treatment and also lower than on the refuse xeric <br />treatment. Other interactions were non-significant. <br />. Canopy cover and production were non-significant for both soil <br />material and mixture. <br />In summary, these data suggest that there are currently few growth <br />differences between the topsoiled and refuse plots on this aspect. The <br />majority of the cover on the refuse plots was contributed by clover <br />species (Table 3.4-2, 3.4-3), while grass contributed most of the cover <br />on topsoiled plets. These data indicate that while growth differences <br />• are not significant, different life forms are dominant on the two sub- <br />~~ strates. <br />3.4.3 Trends <br />1978 and 1979 data were analyzed statistically to demonstrate <br />apparent trends in growth and survival on the different experimental <br />treatments. Table 3.4-8 provides a comparative analysis of the primary <br />factors tested (aspect, slope, mixture, and mulch). Table 3.4-9 pre- <br />sents two-way interactions between primary factors for the two different <br />years. <br />a. Aspect <br />The aspect analysis (Table 3.4-8) indicates a dramatic drop in <br />cover and density between years, which is attributed to high <br />seedling mortality. This observation holds for the remaining <br />comparisons (slope, mixture). Declines in cover and density <br />were much greater on south than north slopes, as observation <br />noted previously. The importance of aspect is demonstrated by <br />_ the production data. North slope treatments increased in pro- <br />duetion between years, xhile south slope production declined <br />36 <br />