Lin Cheng-Fang, Yang Yu-Sheng, Guo Jian-Fen, Chen Guang-Shui, Yuan Yi-Ding
College of Resources Science and Technology, Beijing Normal University, Beijing 100875, China.
Ying Yong Sheng Tai Xue Bao. 2009 Jun;20(6):1278-84.
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.
采用凋落物袋法，对福建省建瓯万木林自然保护区米槠林分的根系分解特征进行了为期两年的研究。试验了直径为0 - 1毫米、1 - 2毫米和2 - 4毫米的三类根系。在两年的分解期内，各类根系均呈现双相模式，前期分解较快，后期较慢。根系中可提取物质的淋失使前期根系分解加快，而根系中酸不溶性物质浓度的增加则抑制了后期的分解。第一年，各类根系的分解速率受其提取物和氮初始浓度的控制；而在第二年，分解速率受根系初始碳氮比以及酸不溶性物质、氮和磷初始浓度的控制。在分解过程中，各类根系的氮浓度均升高，磷浓度均降低，氮呈现富集-释放模式，而磷呈现直接释放模式。
