中文摘要：

采用凋落物分解袋法，研究了神农架不同海拔3种典型森林凋落物的分解动态．结果表明：依据分解速率，常绿阔叶林、常绿落叶阔叶混交林和落叶阔叶林3种典型森林凋落物的分解过程明显分为两个阶段，前期（0～360d）凋落物的质量损失率为后期（361～720d）的2．62～4．08倍，前期的分解速率分别为后期的2．71、1．72和2．69倍．凋落物分解95％所需的时间分别为3．84、4．54和4．16a．分解后期凋落物的分解速率与C／N及N、半纤维素、纤维素、木质素含量均呈显著相关关系．

英文摘要：

Based on the litterbag method, we explored the decomposition dynamics of the litter from the evergreen broad-leaved forests, the mixed evergreen and deciduous broad-leaved forests, and the deciduous broad-leaved forests along an altitude gradient in Mt. Shennongjia, Hubei, China. According to the decomposition rate, the decomposition of the litter could be divided into early stage （0-360 days） and later stage （361-720 days）. With the increase of altitude, the mass loss rates of the litter from the three types of forests at the early stage were 2.62-4.08 times that of the later stage, the litter decomposition rates at the early stage were 2.71, 1.72 and 2.69 times of that at the later stage, respectively, and 95% decomposition of the litter needed 3.84, 4.54 and 4.16 years respectively. The decomposition rate at the later stage was significantly correlated with C/N, and the contents of N, hemieelluloses, cellulose and lignin.