Inter-specific Association among Main Tree Species in Taiwania cryptomerioides Community in Leigong Mountain

WANG Jia-guo;LI Xiao-fang;AN Ming-tai;YUAN Cong-jun;YAN Ling-bin;YU De-hui;College of Forestry,Guizhou University;Guizhou Academy of Forestry;National Nature Reserve of Leigong Mountain;

Taiwania cryptomerioidess community;;tree species;;inter-specific association;;endangered plant;;Leigong Mountain.

The growth environment of Taiwania cryptomerioidess was destroyed with different extents because of less natural distribution and the weaker ecosystem.The community needs to be protected and restored urgently.To have an overall and accurate understanding for their coupling characteristics among the T.cryptomerioidess community in Leigong Mountain,this paper adopted the 2×2contingency table,χ2-test and W-test,combined with the percentage co-occurrence PC,coupling coefficient ACand Spearman correlation coefficient,the basic features of the overall relevance,combination and covariation for 16 major tree species in Leigong Mountain were analyzed.Not significantly negative correlations were generally observed among 16 species.Competitions were keen among populations for the resources,such as sunshine,the community was in an unstable stage of evolution.Through theχ2-test,it was found that significant interspecific associations existed only in a few species,most of them(93.33%)were not in significant level.The coefficients of interspecific associations were low,and the percentages of coexistence of two species were not high,indicating weak association and strong capability of independency of the species.The major species in the community had obvious predominance because of its negative covariance.Most species in the community still had intense competition such as lights and nutrients.