Plant diversity and species composition on the process of vegetation restorationin semiarid loss hilly and gully at Gansu areas

Species composition and plant diversity within watershed were investigated at different habitat in semiarid loess hilly region during the process of vegetation restoration. The results show that the proportion of species to the total plant is as follow: perennial herbageannual herbageshrubtree. The importance of different plants in ecological function were shrub in sunny slope, trees and shrubs in halfshaded and halfsunny slope, and trees in shaded slope. No significant differences were found in the biodiversity between different artificial forests. The environmental condition in the study site is the key factor for biodiversity, and people's production activities are a negative factor for restoration of biodiversity.