土壤有机碳稳定性及其影响因素

Soil Organic Carbon Stability and Influencing Factors

土壤有机碳库在全球碳循环中起着重要作用。利用文献资料,阐明土壤有机碳稳定性理论及其影响因素。土壤有机碳稳定性指土壤有机碳在当前条件下抵抗干扰和恢复原有水平的能力。它是由土壤的理化性质所决定的,是自然因素和人为因素共同作用的结果。土壤有机碳的降解包括生物降解作用和物理化学降解作用等,生物降解作用是主要的过程。把土壤有机碳库分成活性碳库、慢性碳库、惰性碳库,能较好地与土壤微生物的生物降解过程相对应。构建土壤有机碳稳定性概念模型,能更系统地理解有机碳在土壤中的稳定机制。

Soil organic carbon pool plays an important role in global carbon cycle. Based on investigation of previous literatures, this paper is to review soil organic carbon stability mechanisms and its influencing factors. Soil organic carbon stability is defined as the current capacities of soil organic carbon to resist to disturbance and to recover from degradation,and depends on the soil physico-chemical properties impacted by natural and anthropogenic factors. Soil organic carbon decomposition includes bio-process and physico-chemical process, and the bio-process is the dominant one. The division of soil organic carbon into active, slow and passive pools will be easy to described soil organic carbon decomposition with bio-process. The structure of soil carbon stability conceptual model can be helpful to systematically understand soil carbon stability mechanism.