Abstract:

The five kinds of commonly used species diversity and the tree species spatial diversity based on the analysis of tree neighborhoods(TSS) were used to calculate the tree species diversity of the fictitious stand and empirical dataset. The fictitious stand used 2 kinds of 12 specifically designed patterns of spatial species mingling. The empirical dataset includes 3 field observations with known tree coordinates and 9 sample surveys from Xiaolongshan forest area. The results showed that the different models produced different conclusions by using species diversity calculated with species richness and relative abundance combination. The number of survey data and species distribution proportion in community directly influenced the calculated diversity. The Shannon-Wiener index and the Simpson index were not sensitive to the rare species. The value of the tree species spatial diversity (TSS) increased with increasing tree species richness, it was not subjected to the number of investigated trees and the size of plots, and was sensitive to rare species. TSS can properly express the size of the species spatial isolation in the communities with the same number of species, and is a good index measuring plant species diversity.

Key words: tree species diversity, tree species spatial diversity, calculated method