木荷种内与种间竞争的数量关系

Quantitative relation of the intraspecific and interspecific competition in Shima superba

采用Hegyi的单木竞争指数模型对浙江天台山常绿阔叶林常见种木荷的种内、种间的竞争强度进行定量分析。结果表明:木荷所受到的竞争强度随着林木径级的增大而逐渐减小。木荷种内竞争较之与其伴生树种甜槠间的竞争弱。木荷种内和种间竞争强度的顺序为:甜楮>木荷种内>马尾松>短柄>虎皮楠>尾叶冬青>珍珠栗。竞争木对对象木的竞争强度与对象木的胸径大小服从幂函数关系,并可模拟和预测木荷种内和种间的竞争强度。从预测结果可知,当木荷胸径达到20cm后,竞争强度变得很小,且变化幅度不大。竞争强度和对象木的胸径大小成极显著的负相关关系。

With Hegyi singletree competiton index model,the intraspecific and interspecific competition intensity in Shima superba,one of the common species in evergreen broadleaved forest in Tiantai Mountains of Zhejiang Province is quantitatively analyzed.The findings show that the intraspecific competition intensity in Shima superba decreases gradually with the increase in tree diameter.The intraspecific competition in Shima superba is weaker than that in Castanipsis eyrei.The degressive order of the intraspecific and interspecific competition in Shima superba is as follows:Castanopsis eyrei,Schima superba intraspecies,Piuns massoniana,Quercus galndulifera var.brevipetiolata,Daphniphyllum oldhamii,Ilex wilsonii and Castanea henryi.The relationship of the competition intensity between the competitive tree and the objective tree conforms to powrer function rule.The intraspecific and interspecific competition intensity in Schima superba can be simulated and forecasted.Known from the forecasted results,the competition intensity becomes small and the range is not large when the diameter at breast height of Shima superba reaches 20 cm,There is significant negative correlation between the competition intensity and the diameter at breast height of objective tree.