[Root decomposition characteristics of Castanopsis carlesii stand in Wanmulin Natural Reserve of Fujian Province].
By using litter-bag method, the root decomposition characteristics of Castanopsis carlesii stand in Jian'ou Wanmulin Natural Reserve of Fujian Province were studied over two years. Three classes of roots, i.e., 0-1 mm, 1-2 mm, and 2-4 mm in diameter, were tested. During the 2-year period of decomposition, all classes roots showed a bi-phase pattern, being decomposed faster in prophase and slower in anaphase. The leaching loss of extractable substances in roots made root decomposition faster in prophase, while the increase of the acid-insoluble substances concentration in roots restrained the decomposition in anaphase. In the first year, the decomposition rate of all classes roots was controlled by the initial concentrations of their extractive substances and N; while in the second year, the decomposition rate was controlled by the initial C/N and the initial concentrations of acid-insoluble substances, N and P of the roots. During decomposition, all classes roots showed an increasing N concentration and a decreasing P concentration, and the N showed an enrichment-release pattern, while the P showed a direct release pattern.
College of Resources Science and Technology, Beijing Normal University, Beijing 100875, China. tonylcf99@yahoo.com.cn
Cheng-Fang
CF
Lin
Yu-Sheng
YS
Yang
Jian-Fen
JF
Guo
Guang-Shui
GS
Chen
Yi-Ding
YD
Yuan
D002681:China; D017753:Ecosystem; D029962:Fagaceae / Q000737:chemistry / Q000254:growth & development* / Q000378:metabolism*; D009584:Nitrogen / Q000378:metabolism; D010758:Phosphorus / Q000378:metabolism; D018517:Plant Roots / Q000378:metabolism*; D014197:Trees / Q000254:growth & development
D010758:Phosphorus; D009584:Nitrogen