西双版纳原始热带季节雨林生物量研究

用标准木回归分析法（ 乔木、木质藤本） 和样方收获法（ 灌木、草本） ， 研究了西双版纳原始热带季节雨林生物量及其分配。雨林总生物量为６９２－５９０ ｔ／ｈｍ２ ， 其分配为： 乔木层占９８－６６ ％ 、灌木层占０－７６ ％ 、木质藤本占０－５０ ％ 、草本层占０－０９ ％ ， 生物量主要集中于乔木层。乔木层生物量的器官分配向树干和树根集中： 树干占６９－８０ ％ ， 树根占２１－５６ ％ ， 树枝占７－７７ ％ ，树叶占０－７７ ％ ； 生物量径级分配向中等径级（６０ ～７０ ｃｍ） 和最大径级（１５０ ～１６０ ｃｍ） 集中； 生物量垂直分配向上层集中； Ⅰ亚层（ 高度＞ ４０ ｍ） 占６０－５５ ％ 、Ⅱ亚层（２０ ～４０ ｍ） 占３６－７２ ％ 、Ⅲ亚层（３ ～２０ ｍ） 占２－７３ ％ ； 优势种番龙眼生物量占乔木层的２０－０７ ％ ； 乔木层叶面积指数为６－９１ 。

A study on biomass of the primary tropical seasonal rain forest in Xishuangbanna

The biomass and its allocation of the primary tropical seasonal rain forest in Xishuangbanna were studied based on the standard tree regression analysis(for trees and lianas) and clear cut(for shrubs and herbs) The total biomass of the forest was 692 590 t/hm 2, its allocation in the various layers was: the tree layer 98 66%, the shrub layer 0 76%, the liana layer 0 50% and the herb layer 0 09%, the most biomass of the rain forest concentrated on the tree layer The biomass of the tree layer allocation in the organs concentrated on stems and roots: the stems accounted for 69 80%, the roots 21 56%, the branches 7 77% and the leaves 0 77%; the biomass allocation in the DBH classes concentrated on the middle DBH class(60～70 cm) and the largest DBH class (150～160 cm); the biomass allocation in the different tree layer concentrated on the upper layer: the sub-layer Ⅰ(height>40 m) accounted for 60 55%, the sub-layer Ⅱ(20～40 m) 36 72%and the sub-layer Ⅲ(3～20 m) 2 73%; the biomass of dominant species Pometia tomentosa accounted for 20 07%; the LAI of the tree layer was 6 91