The intraspecific and interspecific competition intensity in Polyspora axillaris in Maluan Mountain of Shenzhen City were quantitatively analyzed using Hegyi single tree competition index model. The results showed that the intraspecific competition intensity in P. axillaris was decreased gradually with the increase of forest tree diameter class, and the interspecific competition in P. axillaris was more intensive than that in associated tree species. The order of the intraspecific and interspecific competition intensity in P. axillaris was: P. axillaris > Toxicodendron verniciflua >Litsea rotundifolia var. oblongtfolia >Schima superba >Microcos paniculata >Sapium sebiferum>Litsea cubeba>Sapium discolor. There was significantly negative correlation between the competition intensity and the individual size of objective tree, and the relationship of the competition intensity between the competitive tree and the objective tree and the individual size of objective tree obeyed power function rule. When the diameter at breast height of P. axillaris reached 15 cm, the competition intensity inconspicuously changed into stable situation.%采用Hegyi的单木竞争指数模型对马峦山的大头茶群落种内、种间的竞争强度进行定量分析.结果表明,大头茶种内竞争强度随着植株径级的增大而具减小趋势,种内竞争显著大于种间竞争,对象木种内、种间竞争强度的顺序为:大头茶＞漆树＞豺皮樟＞荷木＞布渣叶＞乌桕＞山苍子＞山乌桕.竞争木对对象木的竞争强度与对象木的个体大小服从幂函数关系,竞争强度和对象木个体的大小呈极显著的负相关关系,当大头茶胸径达到15 cm后,竞争强度趋于稳定.
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