中国土壤有机碳分解特征研究初报

通过土壤样品的室内培养,运用三库一级动力学理论,对我国典型区域土壤有机碳分解特征进行了研究,结果表明:土壤有机碳分解均呈现前期分解快速和后期分解缓慢的特点,土壤有机碳分解的平衡点大概为2个月,之后的日均分解量变化非常小。我国东部4种地带性土壤有机碳分解速率随纬度的增加而递增。不同种植方式农田土壤有机碳分解速率:菜园>水田>旱地>果园。6个地区表层土壤有机碳含量范围为2.31~81.93 g/kg;活性碳含量范围为0.09~1.04 g/kg;缓效性碳含量范围为0.90~33.39 g/kg;惰效性碳含量范围0.92~47.85 g/kg。

A preliminary study on characteristics of soil organic carbon decomposition in China

On the base of first order dynamics model, combining with a laboratory soil incubation experiment, decomposition characteristics of soil organic carbon (SOC) in China typical regions were analyzed. The results showed that there were two decomposition stages of SOC which with a faster decomposition at early stage and a slower one at the later stage. After two months of its equilibrium time, the amount of daily mean decomposition of SOC became very smaller. In the east region, decomposition rates of four zonal soils organic carbon increased with latitude. In these six areas, the total SOC pool contents ranged from 2.31g/kg to 81.93 g/kg; the active carbon pool content ranged from 0.09 g/kg to1.04 g/kg, slow carbon pool content ranged from 0.90 g/kg to 33.39 g/kg and the passive carbon pool content ranged from 0.92 g/kg to 47.85 g/kg.