闽南沿海山地火力楠马尾松混交林种间关系变化规律

对闽南沿海山地火力楠马尾松混交林种间关系动态变化规律的研究结果表明：混交林在1-3年生时，幼林个体占据各自营养空间，种间竞争尚未形成，至4-5年生时，林分开始郁闭，种间关系较为协调，充分发挥了伴生树种的辅佐功能，明显地改善了林分小气候特征，促进混交林的生长，种间关系处于相对稳定状态；6-10年生间，混交林的种间关系处于竞争初期，但此时种间竞争并不十分激烈，主要矛盾为伴生树种的种内竞争；混交林约在10年生后，种间关系矛盾日趋加剧并进入竞争盛期，在竞争中，火和、力楠生长迅速，而马尾松明显受抑而逐渐枯死被淘汰，通过种群间的自行调节，最终群落的竞争关系趋于缓解。根据该混交林种间关系的变化特点，从营林角度出发，在培育过程中，应适时采取适当疏伐措施来调整混交林的种间关系，以发挥混交林的多种效益。

Variation Laws of Interspecific Relations of Michelia macclurei and Pinus massoniana Mixed Forest in the Coastal Upland of South Fujian

The research on variation laws of interspecific relations of Michelia macclurei and Pinus massoniana in the coastal upland of South Fujian indicates that: the mixed forest takes up individual nutrition spaces and doesn't cause interspecific competition during the lst-3th years, during the 4th-5th years. the stand, which begins colsing, forms more harmonized interspecific relations and keeps its relative stabilization, full shows its auxiliary function of the associated tree species, obviously improves its microclimate, and accelerates its growing speed; during the 6th-10th years, the interspcific competition, which is initial isn't intense, but the intraspecific competition of its associated tree species is principal; after the 10th year, the interspcific competition is gradually intense and gets to the competition peak,M.macclurei grows faster than P. massoniana whose growth is obviously restrained and dies down because of its wither; finally, the competition relations of the communities tend to ameliorate with the self-adjustment between the species. Based on the variation characteristics in the interspecific relations of the mixed forest, suitable thinning measures in plantation managements should be taken in time to adjust the interspecific relations of the mixed forest so as to bring the multi-benefits of the mixed forest into full play.