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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 。
The biomass and its distribution of the pristine tropical seasonal rainforest in Xishuangbanna were studied using standard wood regression analysis (tree, woody vine) and quadrat harvesting (shrubs, herbs). The total biomass of rainforest is 692-590 t / hm2, which is distributed as: 98-66% of arbor layer, 0-76% of shrub layer, 0-50% of woody vine, 0-09% of herb layer, Mainly concentrated in the arbor layer. Organ distribution of tree layer biomass concentrated in the trunk and the roots: the stems accounted for 69-80%, the roots accounted for 21-56%, branches accounted for 7-77%, leaves accounted for 0-77%; Biomass diameter distribution to the medium diameter (60 ~ 70 cm) and the maximum diameter (150 ~ 160 cm). The vertical distribution of biomass was concentrated in the upper layer. The I sublayer (height> 40 m) accounted for 60-55% ) Accounted for 36-72%, Ⅲ sub-layer (3 ~ 20 m) accounted for 2-73%; dominant species of P. longan biomass accounted for 20-07% of the arbor layer; arbor layer leaf area index of 6-91.