红楠天然林种内与种间的竞争关系

采用Hegyi的单木竞争指数模型分析了建阳小湖乡葛墩村的红楠天然林种内与种间竞争强度。结果表明,随着林木径级的变大,红楠受到的竞争强度逐渐变小,红楠的种内竞争强度与伴生树种细叶青冈比较而言更弱。红楠种内和种间竞争强度的顺序为细叶青冈>红楠种内>拟赤杨>枫香>木荷。竞争指数与红楠对象木的胸径大小之间服从幂函数关系,并可模拟和预测红楠种内和种间的竞争强度,从预测结果可知,当红楠胸径达到15cm后,竞争强度明显变小,且变幅较小。红楠对象木的胸径大小与竞争强度之间成显著的负相关。

Study on the intraspecific and interspecific competition in Machilus thunbergii community

Adopting Hegyi single tree competiton index model, the intraspecific and interspecific competition intensity in Machilus thunbergii community in Jianyang County, Fujian Province was analyzed. The results showed that the intraspecific competition intensity of Machilus thunbergii decreased gradually with the increase of the diameter class. The intensity of intraspecific competition of Machilus thunbergii was weaker than that between Machilus thunbergii and its companion species, Cyclobalanopsis myrsinaefolia. The degressive order of the intraspecific and interspecific competition in Machilus thunbergii community was as follows: Cyclobalanopsis myrsinaefolia>Machilus thunbergii>Alniphyllum fortunei>Liquidambar formosana>Schima superba. The relationship between the competition index and DBH of the objective tree obeyed a power function. We could simulate and predict the intraspecific and interspecific competition intensity of Machilus thunbergii community. We can know from the prediction results that the competition intensity became very small and modestly when the DBH of Machilus thunbergii reached 15 centimeter. The relationship between the DBH of objective tree and. the competition intensity was significant negative correlation.