福寿林场杉木混交林种内、种间竞争研究

Study on Intraspecific and Interspecific Competition of Cunninghamia lanceolata Mixed Forest in Fushou Forest Farm

以福寿林场3块不同龄组的杉木混交林为研究对象,采用基于Voronoi图的V-Hegyi竞争指数来进行杉木混交林种内、种间竞争研究。结果表明:杉木混交林中杉木株数多的,其种内竞争大于种间竞争,除在幼龄林中柳杉的种内竞争强于其种间竞争外,其他树种皆为种间竞争强于种内竞争;对象木的株数越多,总竞争指数越大,且种内竞争会越大,种间竞争越小;对象木胸径越大,其竞争指数越大。

Three sample plots of three different age groups of Cunninghamia lanceolata mixed forest in Fushou Forest Farm were taken as research objects,the V-Hegyi competition index based on Voronoi diagram was used to study the interspecific and intraspecific competition of Cunninghamia lanceolata mixed forest.The results showed that if there was the larger number of Cunninghamia lanceolata trees in the mixed forests of Cunninghamia lanceolata,its interspecific competition was greater than the intraspecific competition.The interspecific competition of Cryptomeria fortunei was stronger than the intraspecific competition in the young forest.As for all other tree species,the intraspecific competition was stronger than the interspecific competition.The more objective tree number,the bigger the total competition index.And the interspecific competition would become stronger and stronger,the intraspecific competition would become smaller and smaller.The bigger the DBH of the objective tree,the bigger the competition index.