西双版纳季节雨林与橡胶多层林凋落物动态的比较研究

A COMPARATIVE STUDY ON LITTERFALL DYNAMICS IN A SEASONAL RAIN FOREST AND A RUBBER PLANTATION IN XISHUANGBANNA,SW CHINA

本文对西双版纳季节雨林及橡胶多层林的凋落物量动态、各组分的季节变化规律、林地残留物现存量及其分解进行了研究 ,分析比较了两种群落的凋落节律。结果显示 :“双凋落峰”及“叶分解速率较枝分解更快”为两类群落的共有特征 ;森林凋落物量及凋落物分解速率则因群落类型而异 ,橡胶多层林年凋落物总量为 9.85± 0 .78t· hm- 2· a- 1,大于季节雨林的年凋落物总量 8.42± 0 .1 6t· hm- 2· a- 1,橡胶多层林凋落物的消失率常数为 2 .2 5,较季节雨林 ( 2 .0 )的大。本项研究对深入了解热带森林生态系统的结构功能及持续利用热带森林资源具有重要意义。

In this paper,the litterfall dynamics of a seasonal rain forest and a rubber plantation in Xishuangbanna was studied.The results show that there were two litterfall peaks annually in the forest and the plantation.The leaf decomposition rate was faster than that of branch in the two communities. The litterfall in the rubber plantation was 9 85t·hm -2 ·a -1 ,more than 8 42 t·hm -2 ·a -1 in the seasonal rain forest The decomposition rate of litterfall in the rubber plantation was 2 25,faster than 2 0 in the seasonal rain forest.