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slightly. The indicated trend is increases in plant growth on • north aspects and declines in survival and growth on south aspects. b. Slope The 1979 slope analysis indicates that 2:1 and 4:1 slopes performed equally well for all three parameters (cover, den- sity, production). In 1978, higher density and cover were recorded for the 4:1 slope. The indicated trend is that 2:1 slopes are similar to more gentle slopes in their revegetation potential over time. This analysis does not account for the effect of aspect, which is discussed later. c. Mixture The mzxture analysis indicates little difference between the cover and density of the two mixtures during 1979. The mesic mixture contributed much greater density and cover in 1978. The xeric mixture produced nearly twice the biomass of the mesic mixture in 1979 indicating a greater capacity by xeric species to grow under low soil moisture conditions and greater zeric seedling survival. The indicated trend is increased dominance by xeric species on all slopes and aspects. d. Mulch The mulch analysis shows that cover and density showed little response to mulches in 1979; cover and density oa mulched treatments were significantly higher is 1978. The production data show that production was significantly higher with mulch in both 1978 and 1979; the indicated tread is that plant growth will continue to be benefitted by the mulches as compared to unmulched treatments. The following discussion of two-way factor interactions (Table 3.4-9) emphzsizes the density and production factors, since they are direetlq quantitative: a. Aspeet x Slope In 1978, greatest density was obtained on 4:1 slopes regard- less of aspect, and production was non-significant on all ~. slopes and aspects; in 1979, density and production diffe- rences were non-significant on both 2:1 and 4:1 slope angles 40