Dynamics of fine root decomposition and its affecting factors of Pinus massoniana in the Three Gorges Reservoir Area, China
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.
国家科技期刊平台
NSTL
万方数据
维普
