土壤有机碳激发效应研究进展

Advances in Research on Priming Effect of Soil Organic Carbon

土壤有机C激发效应是加入外源物后土壤有机C周转短期的强烈变化。综合多年的研究结果表明:外源物的加入可能加速土壤有机C的矿化,产生正激发效应;也可能减缓土壤有机C的矿化,产生负激发效应。激发效应的产生受输入外源物的数量和质量、土壤本身的性质等因素影响,其产生机理还需进一步研究。本文综合这些年来利用同位素(13C和14C)示踪技术进行的土壤有机C研究,比较系统地阐述了土壤有机C激发效应产生的驱动因子、机理及其定量化,并提出了有待研究的内容。

Priming effect is a strong, short-term change in the turnover of soil organic carbon （SOC） caused by exogenous substrates. Addition of exogenous substrates may accelerate SOC decomposition - a positive priming effect, and also may retard SOC decomposition - a negative priming effect. Priming effects are governed by many factors, such as quantity and quality of the exogenous substrates and the soil properties. In this paper a review is presented to elucidate direct driving factors, mechanisms and quantification of the priming effect by compiling papers using isotope techniques （^13C and ^14C）, and to put forward items to be further studied.