海南岛尖峰岭热带山地雨林及其更新群落的凋落物量与贮量

LITTER PRODUCTION AND STORAGE IN THE NATURAL AN REGENERATED TROPICAL MONTANE RAIN FORESTS AT JIANFENGLING,GAINAN ISLAND

本文对海南岛尖峰岭热带山地雨林及其更新群落的凋落物产量动态、各组分的季节变化规律及凋落物贮量进行了研究，分析比较了这两个林分的凋落节律的异同，并对凋落枝的收集方法进行了对比。本文指出：“双凋落峰”和“由于台风影响而产生大量非正常凋落物”是尖峰岭热带森林的两个重要的凋落特征。本项研究对深入了解热带林生态系统的功能、对热带森林资源的保护和永续利用均有重要意义。

We compared the dynamics of litter production and storagc in the natural tropical montane rain forest with that of a regenerated forest after clear cut-ting at Jianfengling, Hainan lsland,and studied the cffect of typhoon onlitter production. The mean annual litterfall(D.w)in the tropical montane rain forcestwas 9.177t·ha￣-1,of which the leaves,branches,and flowers and other mixed matter accounted for 49.6%,37.0%and l3.4%,respectively.The annual Iit- terfall in the regenerated forest was 9.323t·ha￣-1,with the leaves,branches,and flowers and other mixed matter occupying 56.2%,33.0%,and 10.89 %,respectively, of the total litterfall.The storage of litterfall in both of the two forest types was 5.9t·ha￣-1. A double falling peak and extremely high percentage of litterfall caused by typhoon are characteristic of the litter production in the tropical forest at the Jianfengling area. In some years,the typhoon-induced litterfall account- ed for over 40%of the total litter production,illustrating that the effect of typhoon on tropiacl montane rain forest ecosystems is frequent,large and far eaching