Abstract:
Aburied bag method was used to investigate the decomposition dynamics of different-size roots in two main forests type in Xishuangbanna,Yunnan Province,the tropical rain forest and rubber plantation.After one-year’s experiments,it was found that:① For different forests,the root decomposition rate in rain forest was much lower than that in rubber plantation;② For the same forest,the decomposition rates of fine and small roots were much higher than those of medium and coarse roots;③ The root decomposition rate correlated with C-Nor C-Pratio,which the higher the C-Nor C-Pratio was,the lower the decomposition rate was;④ In rain forest,the daily decomposition coefficients of fine( 2mm),small(2—10mm),medium(10—20mm) and coarse(20mm) root were 0.0010,0.0025,0.0007,0.0007,respectively,while in rubber plantation,were 0.0030,0.0019,0.0013,0.0017,respectively.