长苞铁杉天然林群落种内及种间竞争关系研究

Studies on intraspecific and interspecific competition in natural communities of Tsuga longibracteata

通过各种竞争指数的比较筛选,得到较能客观反映长苞铁杉种内、种间竞争关系的竞争指数,定量地分析了长苞铁杉种内和种间竞争强度。结果表明:长苞铁杉种内竞争随胸径的增大而逐渐减少;种间与种内竞争关系顺序为:长苞铁杉-长苞铁杉>猴头杜鹃-长苞铁杉>青冈栎-长苞铁杉>其它树种-长苞铁杉。竞争强度与对象木的胸高直径服从双曲线回归关系,利用模型预测了长苞铁杉种内、种间的竞争强度。

The intraspecific and interspecific competitions of Tsuga longibracteata were analyzed quantitatively,using the selected competition index that were presented through analysis and simulating of sample plot data. Intraspecific competition intensity was Tsuga longibracteata reduced with the increase of diameter class of the trees. The order of competition intensity is Tsuga longibracteata-Tsuga longibracteata>Rhododendron simiarum-Tsuga longibracteata>Cyclobalanopsis glauca-Tsuga longibracteata>others species-Tsuga longibracteata. A remarkable regression model of the relationship between competition intensity and diameter class of objective tree individuals was established and used to predict competition intensity.