On intraspecific and interspecific competition among Abies yuanbaoshanensis community

Abies yuanbaoshanensis Y. J. Lu et L. K. Fu is a rare and endangered plant, it is only found on Yuanbaoshan Mountain in Guangxi, China. By using Hegyi,s competition index model for individual tree 〔 CI =∑ N j =1( Dj/Di )·1 Lij 〕, the intraspecific and interspecific competition in A. yuanbaoshanensis community were investigated. The results show that intraspecific competition of A. yuanbaoshanensis is more intensive than interspecific competition. The competition intensity of competitive tree against objective tree and the size of objective tree fit power function CI =A D +{ B }, and competition intensity decreases with the increase of the size of objective tree. The CI change is not significant when the DBH of A. yuanbaoshanensis reaches 35-40 cm. The model can simulate and predict the intraspecific and interspecific competition among Abies yuanbaoshanensis community in Guangxi.=