西双版纳热带湿性季节雨林生物量及其分配规律研究

BIOMASS AND ITS ALLOCATION OF A TROPICAL WET SEASONAL RAIN FOREST IN XISHUANGBANNA

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?

The biomass and its allocation of a tropical wet seasonal rain forest in Xishuangbanna were studied based on the standard tree regression analysis (for trees and lianas) and clear cut method (for shrub and herb).The total biomass of the community was 360.909t·hm -2 ,and its allocation in different layers was:tree layer 352 563t·hm -2 (account for 97 69%),shrub layer 4 737t·hm -2 (1 31%),liana 3.108t·hm -2 (0 86%) and herb layer 0 501t·hm -2 (0 14%).Most of the biomass of the community concentrated on the tree layer,the organic allocation of the biomass in tree layer was:stem 241 27t·hm -2 (68 43%),root 69 614t·hm -2 (19 75%),branch 37.287(10 57%)t·hm -2 ,and leaves 4 392t·hm -2 (1.25%);The DBH class allocation of the biomass mainly concentrated on the middle DBH class,the biomass of six DBH classes from 20cm to 80cm reached 255 460t·hm -2 (72 46%);The vertical allocation of the biomass in tree layer was:the sub layer Ⅰ 219 365t·hm -2 (62 22%),the sub layer Ⅱ 107 743t·hm -2 (30 56%),and the sublayer Ⅲ 25 455t·hm -2 (7 22%);There are twenty six species with biomass over 0 5% of the total biomass of the tree layer,and three species with biomass over 5%,i..e., Pometia tomentosa ( account for 19 67%), Barringtonia macrostachya (5 44%) and Terminalia myriocarpa (5 27%).The species biomass allocation showed that the community had distinct dominant species.The LAI of the tree layer was 5.724.