樟树福建柏混交林种内及种间竞争研究

通过对樟树福建柏混交林40个样圆的调查,以樟树为对象木,采用Hegyi单木竞争指数模型分析樟树的种内种间竞争关系.结果表明,樟树的种间竞争强度大于种内竞争强度,并且竞争强度随对象木径级的增大逐渐减小.当对象木径级≥23 cm时竞争强度变化较小,径级在14～17时受到的种间竞争强度最大.樟树种内、种间、林分的竞争强度符合幂函数CI =AD-R的关系,用此模型拟合各径级的种内、种间竞争强度效果良好,可对不同径级的樟树所受的竞争强度进行预测.

Intraspecific and Interspecific Competition of Cinnamomun camphora and Fokienia hodginsii Mingled Forest

Based on the 40 circular sample surveys of Cinnamomum camphora and Fokienia hodginsii mingled experimental forest,with Cinnamomum camphora being the objective tree,the paper applies the Hegyi single tree competition index model to analyze the intra-and interspecific competition relations of Cinnamomum camphora and Fokienia hodginsii.The result shows that the interspecific competitive intensity of Cinnamomum camphora outweighs its intraspecific competitive intensity,and the competitive intensity will decrease gradually with the increasing diameter class of the objective tree.The competitive intensity varies less when the diameter class of the objective tree is more than 23cm,and it reaches the maximum when the diameter class is between 14cm and 17cm.The intra-and interspecific and forest stand competitive intensity of Cinnamomum camphora matches the power function CI=AD-B.On condition that the intraspecific and interspecific competitive intensity of different diameter classes functions well,this mode can be applied to forecast the competitive intensity of Cinnamomum camphora of different diameter classes.