中文摘要：

碳作为重要的生命元素,在土壤-植物系统物质循环中发挥重要作用.作为一种天然的示踪物,稳定碳同位素（13C）较放射性同位素具有安全、无污染、易控制的优点,在土壤-植物生态系统碳循环研究中得到广泛应用.通过检测土壤-植物体系中稳定碳同位素的自然丰度或采用稳定碳同位素标记有机材料,能够较真实地了解植物的光合特性、光合产物在土壤-植物体系中的运转及其在土壤中的分解、转化等过程.本文概述了稳定碳同位素技术在植物光合作用及光合产物运转、古气候重建、土壤有机质周转以及植物-根际微生物相互作用等方面的研究进展,并针对当前研究中存在的问题提出了今后的研究展望.

英文摘要：

AS a main life element, carbon plays important role in the matter cycling in soil-plant system. Stable carbon isotope ^13C has been widely used in the study of carbon cycling in soil-plant system, due to its safe, no pollution, and easy to be handled. Through the analysis of both natural and labeled ^13C organic matter in soil-plant system, a better understanding of the mechanisms of photosynthesis, the distribution of photosynthates in plant-soil system, the source of new carbon in soil could be achieved. In this paper, the isotope technique in the researches of photosynthesis, reconstruction soil organic matter, and interactions between plants and rhizosphere summarized, and the perspectives of the application of stable carbon discussed, based on the issues existed in current researches. the fate of plant litter, and applications of stable carbon of paleoclimate, turnover of microorganisms were briefly isotope technique were also