Abstract:

Based on the 2×2 contingency table, the interspecific associations of tree and shrub species in the deciduous broad-leaved forest at the elevation from 1150m to 1500m in Bao Tianman, Henan province were studied by different indices. The results show that X² test, together with percentage co-occurrence (PC) and association coefficient (AC) was effective way to measure the association. The more intense the positive association was, the larger the value of niche overlap was; the more intense the negative association was, the smaller the value of niche overlap was. In the light of the interspecific association, tree species can be divided into four ecogroups of species.

Key words: Deciduous broad-leaved forest, Interspecific association, Bao Tianman