根际沉积及其在植物-土壤碳循环中的作用

植物根际沉积是一种重要的植物与土壤交换的界面过程,在土壤碳周转方面具有重要的作用；根际碳的沉积也是联系植物、土壤及微生物的桥梁.本文就近年来关于根际沉积中碳平衡、碳循环等相关研究,阐述了根际碳沉积的机制,探讨了相关试验中存在的问题,以及不同植物品种、种类和生育期根际沉积的差异和根际沉积物与土壤呼吸的关系,指出了根际沉积在植物 土壤体系中碳循环的重要作用.在此基础上，提出了未来的研究领域及方向.

Rhizodeposition and its role in carbon cycling in plant-soil system

Rhizodeposition is an important interface process of the exchange between plant and soil, and plays an important role in soil carbon turnover. The rhizodeposition of carbon is also the bridge linking plant, soil, and microorganisms. This paper reviewed the researches on the rhizodeposition in carbon balance and carbon cycling, expounded the mechanisms of carbon rhizodeposition, and discussed the problems in related experiments, the differences of rhizodeposition with plant species, cuhivars and growth stages, the relationships between rhizodeposition and soil respiration, and the significance of rhizodeposition in the carbon cycling in plant-soil system. Some related research tasks in the future were also proposed.