Studies on Species Diversity of Evergreen Broad-Leaved Forest in Shiyang Forest Center

Analysis on the species richness and diversity index, community evenness in different plots and layers of evergreen broad-leaved forest in Shiyang Forest Center in Wencheng, Zhejiang province resulted that species richness and diversity index, community evenness of the second sublayer of tree layer was much greater than that of the first sublayer in the vertical structure of the community. There was no significant difference of diversity index between the tree layer and the shrub layer. The species richness and diversity index of the tree layer and the shrub layer was obviously higher than that of the herb layer, and their evenness had evident difference. The diversity indexes of tree, shrub and herb layer in various plots had a little difference.