杉木厚朴混交林木邻体竞争的研究

A Study on Adjacent Wood Competition in Mixed Plantation of Cunninghamia lanceolata and Magnolia officinalis

根据调查资料,采用HEGYI提出的单木竞争模型对杉木厚朴混交林种内、种间的竞争强度进行定量分析.结果表明,杉木和厚朴种内、种间竞争强度随着林木径级的增大而逐渐减小;种内竞争和种间竞争的强度顺序为厚朴种间>杉木种内>杉木种间>厚朴种内.竞争强度与对象木的胸径服从幂函数关系,当杉木胸径达到39 cm以上时,竞争强度变化很小;厚朴胸径达到42 cm时竞争强度变化很小,利用模型预测了杉木和厚朴总的竞争强度.

By using Hegyi＇ s competition index model for individual tree, in the mixed plantation of Cunninghamia lanceolata （CL） and Magnolia the intraspecific and interspecific competition officinalis （MO） were investigated. Results show that both intraspecific and interspecific competition intensities of CL and MO reduced with increase in diameter scale of the trees. The order of competition intensity was： MO interspecific 〉 CL intraspecific 〉 CL intraspecific 〉 MO intrapecific. The ratio between competition intensity and the breadth of objective tree is in agreement with the Power Function relationship. The model actually predicted the overall intraspecific and interspecific competition intensity.