人为干扰强度对马尾松人工林生物量及其分配的影响

Effect of Different Disturbances on Biomass and Its Distribution of Pinus massoniana Plantation

采用分层切割法探讨了不同人为干扰强度对马尾松人工林林地上部分生物量及其分配的影响.结果表明:就林分单株生物量而言,马尾松人工林中的幼苗、幼树、小树的单株生物量随着干扰强度的增强而增加,而在中树、大树阶段,马尾松单株生物量大小与干扰强度成反比,在单株生物量分配率上看,不同立木级马尾松单株各器官生物量分配率与干扰强度无直接相关关系;就马尾松林分地上部分总生物量而言,轻度干扰有利于林分总生物量积累.

Pinus massoniana plantation is one of the most important forests in South China and the conditional management of Pinus massoniana is predatory management. The influence of human-caused disturbances on the biomass and its distribution of Pinus massoniana is discussed in this paper by adopting the ＂layer-cutting＂ method and mean tree method, in order to afford a theoretical base for the management of Pinus massoniana plantation, The results indicate that as far as the individual biomass is concerned, it increases with the decrease of disturbance intensities during the status of seedling, sapling and a young tree; that during the status of a middle and large tree, the individual biomass decreases with the decrease of disturbance intensities; that as far as the total biomass is concerned, the biomass distribution to different organs has no direct relation to disturbances ; and that as far as the total biomass is concerned, slight disturbances contribute to the accumulation of stand biomass.