神农架不同海拔典型森林凋落物的分解特征  

Litter decomposition of typical forests along an altitude gradient in Mt.Shennongjia,Hubei,China

作　　者：潘冬荣[1,2] 柳小妮[1] 申国珍[2] 谢宗强[2] 罗璐[2] 刘蕾[3] 

机构地区：[1]甘肃农业大学草业学院/草业生态系统教育部重点实验室,兰州730070 [2]中国科学院植物研究所植被与环境变化国家重点实验室,北京100093 [3]三峡大学化学与生命科学学院,湖北宜昌443002

出　　处：《应用生态学报》2013年第12期3361-3366,共6页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(30870416);国家基础研究发展计划项目(2010CB951301);中国科学院战略性先导科技专项(XDA050203)资助

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．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.

关 键 词：神农架 海拔梯度 凋落物分解 质量残留率 化学组成 

分 类 号：S718.5[农业科学—林学]