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本文采用标准木回归分析法（乔木层、木质藤本）和样方收获法（灌木层、草本层）研究了西双版纳湿性季节雨林生物量及其分配规律。群落总生物量为３６０．９０９ｔ·ｈｍ－２，其在各层的分配为：乔木层３５２．５６３ｔ·ｈｍ－２（占群落生物量的９７．６９％）、灌木层４．７３７ｔ·ｈｍ－２（占１．３１％）、木质藤本３．１０８ｔ·ｈｍ－２（占０．８６％）、草本层０．５０１ｔ·ｈｍ－２（占０．１４％）。群落生物量绝大部分集中于乔木层。乔木层生物量的器官分配为：干２４１．２７０ｔ·ｈｍ－２（占乔木层生物量的６８．４３％）、根６９．６１４ｔ·ｈｍ－２（占１９．７５％）、枝３７．２８７ｔ·ｈｍ－２（占１０．５７％）、叶４．３９２ｔ·ｈｍ－２（占１．２５％）；乔木层生物量的径级分配主要集中于中等径级，胸径在２０～８０ｃｍ间的６个径级，生物量达２５５．４６０ｔ·ｈｍ－２（占７２．４６％）；生物量在乔木层中垂直分配为：Ｉ亚层２１９．３６５ｔ·ｈｍ－２（６２．２２％）、Ⅱ亚层１０７．７４３ｔ·ｈｍ－２（３０．５６％）、Ⅲ亚层２５．４５５ｔ·ｈｍ－２（７．２２％）；生物量大于乔木层生物量０．５％的树种共计２６种，其中大于５％的有番龙眼（Ｐｏｍｅ?
In this paper, the biomass and its distribution of wet seasonal rainforest in Xishuangbanna were studied using standard wood regression analysis (tree layer, woody vine) and quadrat harvesting (shrub layer, herb layer). The total biomass of the community was 360.909 t · hm-2, and its distribution in each layer was 352.563 t · hm-2 (accounting for 97.69% of the biomass of the tree), 4.737 t · hm- 2 (accounting for 1.31%), woody vine 3.108t · hm-2 (accounting for 0.86%) and herb layer 0.501t · hm-2 (accounting for 0.14%). The vast majority of community biomass concentrated in the arbor layer. The organ distribution of arbor layer biomass was 241.270 t · hm-2 (accounting for 68.43% of arbor layer biomass), root 69.614 t · hm-2 (accounting for 19.75%), branch 37.287 t · Hm-2 (accounting for 10.57%) and 4.392 t · hm-2 (accounting for 1.25%). The grading distribution of arborous biomass mainly concentrated in the medium diameter class with DBH ranging from 20 to 80 cm 6 diameter classes and biomass of 255.460 t · hm-2 (accounting for 72.46%). The vertical distribution of biomass in the arbor layer was 219.365 t · hm-2 (62.22%) of the I sublayer, The total number of tree species with biomass greater than 0.5% of biomass was 26.7% , Of which more than 5% have longan (Pome?