Interspecific association of dominant tree populations in Phoebe bournei forest with disturbance

2×2 contingency table,χ² test,percentage co-occurrence(JI),association coefficient (AC) and spot relation coefficient (PCC) methods were used to determine the interspecific association of dominant species populations in the arbor layer of Phoebe bournei forest in Fengtou Village,Dongping Town, Zhenghe County,Fujian Province. Sampling lots were of the following areas:100m²,200m² and 400m². Results show that interspecific associations of most species pairs have no obvious correlation. Among 105 species pairs in arbor layer, there are 7 with significantly positive association and the other 98 are somewhat insignificant. This implies that the species are mostly independently distributed. Compared with undisturbed species communities, disturbance influences interspecific relation to a certain degree. χ² tests, together with 100m² quadrates explicitly display the characteristics of associations among the dominant vegetation species.