In order to understand the effects of slope aspect and human disturbances on the diversity and community regeneration

field and laboratory analyses were conducted on Pinus tabulaeformis artificial forest in loess hilly region.The results showed that the community similarity coefficient of undergrowth was 74%

74% and 38% between shady and sunny slopes

between the natural and litter removed conditions

and between natural and timbered conditions

respectively.The indices of richness(R)

Shannon-Wiener(H)

and Simpson(D) of the shrub layer on the shady slopes were larger

while Pielou(J) in the shady was smaller than those on the sunny slopes.For herbaceous layer

R

H

D and J on the shady slopes were larger than those on the sunny slopes.The values of R

H and D in shrub layer were the highest under litter removed condition

then followed by natural state and timbered land;however J showed the exactly opposite trend.The values of R

H

D and J in herbaceous layer were the highest under litter removed

then followed by timbered and natural forests.The best regeneration of seedlings was found in the timbered land and on the shady slopes

respectively.