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on the north aspects, regardless of slope angle. This observa- • tioa confirms an earlier statement that aspect may be more important than slope angle in defining revegetation success over time in this experiment. b. Aspect x Hixture In 1978, the mesic mixture density was significantly higher than the xeric mixture oa both .aspects; density was sigaifi- caatly higher oa the north aspect than south for both mix- tures. In 1979, density declined for both mixtures, but much more for the mesic species. On the north aspect, xeric species density was significantly higher than the mesic, a reversal of the previous year. Production differences were non-significant in 1978; is 1979, xeric mixture production was much higher than the mesic on both aspects. These data indi- cate a strong differential response to aspect by both mixtures and the better adaptation by xeric species to prevailing conditions over the two year period. c. Slone x Hixture •~ In 1978, mesic mixture density was significantly higher than ' xeric over both slopes; density of both mixtures was signifi- cantly higher on 4:1 than 2:1 slopes. In 1979, mesic species density declined below xeric species levels on both slopes; the xeric mixture density was higher on 4:1 than 2:1 slopes. 1978 production differences were non-significant between mixtures and slopes. 1979 xeric mixture production was significantly higher than mesic on both slopes; xeric 4:1 slope production was higher than xeric 2:1; mesic 4:1 slope producLioa was significantly lowez than 2:1. These data indicate the greater adaptability of xeric over mesic species over time and a slightly different response to slope angle by the two mixtures. The better growth by mesic species on the 2:1 slopes is attributed to the fact that the majority of mesic species production was measured on 2:1 north slopes, which were the coolest slopes available in this experiment. ~l 41