西双版纳刀耕火种轮歇地植物群落生物量的初步研究

西双版纳地处云南省南部 ,境内大部分为海拔5 4 0～ 1 2 0 0ｍ的阶地、丘陵和低中山地 ,居住在这的基诺、哈尼、苗、瑶、布朗等少数民族沿袭着上千年的刀耕火种耕作方式。自 2 0世纪 5 0年代以来 ,随着人口的增长 ,对自然资源的需求越来越大 ,耕作面积逐年扩大 ,土地轮歇时间逐渐缩短 ,造成森林退化 ,水土流失严重 ,土地生产力下降 ,生态环境遭到严重破坏等问题1 ] 。本文拟对 5年生刀耕火种后轮歇地更新群落的生物量进行分析 ,旨在探讨刀耕火种后的植物群落 ( 5年生 )的生物量及其分配规律 ,以及刀耕火种对生物量干物质积累过程的影响。进…

A Preliminary Study on the Biomass of Plant Community in Swidden Land after Slash and Burn in Xishangbanna

The biomass and its allocation of a five years secondary forest which regenerated after slash and burn in Xishangbanna were estimated based on standard tree regression analysis (for tree )and clear cut method (for shrub、 liana、 herb and litter).The result shows that the total biomass was 40.6959 t*ha-1, of which 30.37 t*ha-1 are contributed by tree layer; The biomass of shrub is 3.77 t*ha-1,and of the liana and herb are 0.55 t*ha-1 and 0.32 t*ha-1,respectively. The biomass of litterfall is 4.48 t*ha-1,dead standing tree is 0.21 t*ha-1. The optimum regression models of different dominant plants and organs of the sample trees of tree layer in the stands were built.