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应用生态学报 ›› 2011, Vol. 22 ›› Issue (03): 565-570.

• 第六届中国青年生态学工作者学术研讨会会议专栏 • 上一篇    下一篇

退化红壤丘陵区森林凋落物初始化学组成与分解速率的关系

陈法霖1,江波1,张凯1,郑华1**,肖燚1,欧阳志云1,屠乃美2   

  1. 1中国科学院生态环境研究中心城市与区域生态国家重点实验室| 北京 100085; 2湖南农业大学农学院| 长沙 410128
  • 出版日期:2011-03-18 发布日期:2011-03-18

Relationships between initial chemical composition of forest leaf litters and their decomposition rates in degraded red soil hilly region of Southern China.

CHEN Fa-lin1, JIANG Bo1, ZHANG Kai1, ZHENG Hua1, XIAO Yi1, OUYANG Zhi-yun1, TU Nai-mei2   

  1. 1State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;2College of Agronomy, Hunan Agricultural University, Changsha 410128, China
  • Online:2011-03-18 Published:2011-03-18

摘要: 通过小盆+凋落袋控制试验,研究了我国南方退化红壤丘陵区8种森林凋落物和4种混合凋落物初始化学组成与分解速率的关系.结果表明:阔叶凋落物中的氮、磷、钾、镁含量显著高于针叶凋落物,木质素、碳含量显著低于针叶凋落物;凋落物分解速率与凋落物初始氮、磷、钾、镁含量呈显著正相关,与凋落物初始碳、木质素含量以及木质素/氮、木质素/磷和碳/磷值呈显著负相关;木质素含量解释了凋落物分解速率变异的54.3%,是影响分解速率的最关键因子,凋落物碳、氮、磷含量也与分解速率密切相关,它们与木质素含量一起可解释分解速率变异的81.4%.在退化红壤丘陵区植被恢复过程中,低木质素含量、高氮磷含量的阔叶物种的引入有利于加速凋落物的分解速率和土壤肥力的恢复进程.

关键词: 森林凋落物, 化学组成, 凋落物分解速率, 红壤丘陵区

Abstract: A pot experiment with litter bags was conducted to study the relationships between the initial chemical composition of 8 kind forest leaf litters and 4 kind mixed leaf litters and their decomposition rates in degraded red soil hilly region of Southern China. Comparing with needle-leaf litters, broad-leaf litters had significantly higher contents of N, P, K, and Mg, but significantly lower contents of lignin and C. The decomposition rates of test litters were significantly positively correlated with the litters initial contents of N, P, K, and Mg (P<0.05), and negatively correlated with the initial contents of lignin and C as well as the lignin/N, lignin/P, and C/P ratios (P<0.05). The lignin content explained 54.3% of the variation in litter decomposition rates, being the key affecting factor. Litters C, N, and P contents also had close correlations with the decomposition rates, and together with lignin content, contributed 81.4% of the variation. It was suggested that in the process of vegetation restoration in degraded red soil hilly region of Southern China, introducing broad-1eaf trees with lower lignin and higher N and P contents would benefit the acceleration of forest litters decomposition and the restoration of soil fertility.

Key words: forest litter, chemical composition, litter decomposition rate, red soil hilly region of Southern China