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神农架不同海拔典型森林凋落物的分解特征

潘冬荣1,2,柳小妮1,申国珍2**,谢宗强2,罗璐2,刘蕾3   

  1. (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)
  • 出版日期:2013-12-18 发布日期:2013-12-18

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

PAN Dong-rong1,2, LIU Xiao-ni1, SHEN Guo-zhen2, XIE Zong-qiang2, LUO Lu2, LIU Lei3   

  1. (1College of Pratacultural Science, Gansu Agricultural University/Ministry of Education Key Laboratory of Grassland Ecology System, Lanzhou 730070, China; 2State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy Sciences, Beijing 100093, China; 3College of Chemistry and Life Science, China Three Gorges University, Yichang 443002, Hubei, China)
  • Online:2013-12-18 Published:2013-12-18

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(0~360 d)凋落物的质量损失率为后期(361~720 d)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4.16 a.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.

 

Abstract: 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, hemicelluloses, cellulose and lignin.