西双版纳热带季节雨林与橡胶林不同径级根分解

 通过分解网袋法对西双版纳2种重要森林类型———热带季节雨林和橡胶林(Hevea brasiliensis)4种不同径级的根(细根<2mm,2mm<小根<10mm,10mm<中根<20mm,粗根>20mm)进行为期1a的研究,发现热带季节雨林根系分解速率小于橡胶林;细、小根分解速率大于中、粗根;根分解速率与根自身C/N,C/P有强相关性;热带季节雨林细根、小根、中根、粗根日分解系数分别为0.0010,0.0025,0.0007,0.0007,橡胶林细、小、中、粗根分解系数分别为0.0030,0.0019,0.0013,0.0017.

A decomposition dynamics study of different-size roots between a tropical rainforest and a rubber plantation in Xishuangbanna,Yunnan,SW China

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.