Abstract:

In the thesis, Shannon-Wiener species diversity index, Pielou evenness index, Margalef richness index and biomass are selected as the basic indicators, and explore the stability of community and vegetation effect on soil and water conservation under the different forest types in Anding district . The results showed that we should select the suitable trees and the rational allocation system so as to Increase species diversity and thus promote the stability of communities in term of the effect that species diversity plays on community stability. Besides, viewing from the the biomass of plant species quantitative analysising, the biomass, especially the litter biomass of mountain peach and caragana microphylla is higher. So it can play the role of reducing runoff, increasing soil nutrients and storing water.