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Chinese Journal of Applied Ecology ›› 2017, Vol. 28 ›› Issue (2): 391-398.doi: 10.13287/j.1001-9332.201702.017

• Special Features for 2016 Annual Meeting of Ecological Society of China • Previous Articles     Next Articles

Dynamics of fine root decomposition and its affecting factors of Pinus massoniana in the Three Gorges Reservoir Area, China.

WANG Na1, 2, CHENG Rui-mei1, 2*, XIAO Wen-fa1, 2, SHEN Ya-fei1, 2   

  1. 1State Forestry Administration Key Laboratory of Forest Ecology and Environment, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China;
    2Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China.

  • Received:2016-06-03 Online:2017-02-18 Published:2017-02-18
  • Contact: * E-mail: chengrm@caf.ac.cn
  • Supported by:
    This work was supported by the 13th Five-year National Key Plan (2016YFD0600204) and the Science and Technology Basic Work (2014FY120700).

Abstract: A decomposition experiment for a year was conducted at Jiulingtou Forest Farm, Zigui County, Hubei Province, China to examine the decomposition dynamics of fine roots with different diameters (<0.5, 0.5-1 and 1-2 mm) and its main affecting factors for Pinus massoniana. The results showed that the decomposition rate decreased with the increasing root diameter. The annual decomposition rates for fine roots with diameters <0.5, 0.5-1 and 1-2 mm were 34.0%, 28.0% and 25.7%, respectively. The decomposition rate of <1 mm fine root decreased along time, and 1-2 mm fine root increased first and then decreased. In the fine root decomposition process, N, P and Ca concentrations increased along time, and K concentration decreased firstly, then increased, and then decreased along time. Fine root decomposition rate was significantly related to initial chemical composition (N, P, K, Ca, C/N and C/P) of fine roots. Ca concentration in fine root and soil temperature were the major factors affecting fine root decomposition.