杉木、马尾松半天然混交林群落结构特征分析

Analysis on Community Structure of Cunninghamia Lanceo lanceoata and Pinus Massioniana Seminatural Mixed-Forest

通过对不同立地条件下杉木马尾松半天然混交林群落结构、多度分布及建群种生长的对比分析 .结果表明 ,上、下坡的林分均处于向上发展阶段 ,但下坡所受外界干扰较多 ,而使乔木层的林分密度比上坡林分小 .与上坡林分相比 ,下坡林分开物种更为丰富 ,乔木层的个体发育较好 .对于建群种杉木、马尾松 ,上下坡林分的个数相差悬殊 ,下坡林分的林下更新不良 ,因此 ,对发展到一定阶段的杉木马尾松半天然混交林 ,应采取适当的抚育和保护措施 ,控制林分密度 ,合理配置林分层次结构及树种结构 ,有利于提高林分生产力 .

The community structure, abundance di st ribution and growth of constructive species of Cunninghamia lanceolata and Pinus massioniana semi-natural mixed-forest were analyzed in different sit e conditions. The result showed the forests in down and up slope were on a post ive development stage. But the forest density of arbor layer in down slope was s maller than in up slope because of more disturbances. Compared to the up slope f orest, the species in the down slope forest were more abundant and the individua ls of arbot layers grew better. To the construetive species, Cunninghamia lanc eolata and Pinus massioniana, the individual numbers were a great dispari ty between the down slope forest and the up slope forest. The regneration was wo rse in the down slope forest. When Cunninghamia lanceolata and Pinus massi oniana semi-natural mixed-forest developed to some stage, appropriate tendin g and protecting measures should be implemented. The forest density should be co ntrolled, the layer and species structures should be disposed rationally,which i mproved production.