中文摘要：

由于受气候、复杂岩溶过程等影响,石笋碳同位素（δ13）研究相对于其他代用指标甚少,甚至被忽略。从影响石笋δ13的气候与非气候因子入手,结合全球数十个洞穴记录及现代观测试验,分析碳同位素信号在岩溶系统内部的传递方式和路径,探讨不同时间尺度下δ13与气候变化之间的关系。指出石笋δ13虽然在百年—年代际尺度上表现出的噪音强度明显上升,但从轨道至千年尺度上看,温度、湿度（降水）等气候要素在不同区域所充当的主控因子角色直接或间接地影响上覆土壤植被状况、土壤CO2产率等当地生态环境变化。未来研究应深入挖掘δ13信号在岩溶系统中的传输共性及其气候、环境控制因子,注重石笋δ13季节变化特征研究,充分发挥其在揭示当地环境或灾害性事件方面的独特优势,并运用多指标、多种方法手段理解岩溶过程、全球碳循环与气候变化之间的联系。

英文摘要：

The application of carbon isotope （δ13C） collected from stalagmite to reconstruct the past climate and/or ecologic evolution, relative to other preserved indicators, is much limited due to its complex influencing fac- tors including climate outside cave and complicated and site-specific karstic process. In terms of various climate and non-climate limiting factors on stalagmite δ13c, and combined with a large number of geological records and modern cave monitoring data of the latest researches, the pathway and behavior of the signal transmission of δ13C inthe cave system were analyzed. The possible relationship between δ13C excursions and climate oscillations under different time scales was thus discussed. Although the degree of noise becomes increasing mixed with δ13C on cen- tennial scales or shorter, the climatic elements, such as temperature and humidity （or precipitation）, as predomi- nant modulators exert directly or indirectly influence on vegetation overlying the soil and associated soil CO2 produc- tivity on millennial-orbital scales. Future work should be focused on further deeply extracting the common δ13C sig- nals from specific eaves by exploring the controlling factors, both including climatic and non-climatic ones, attac- hing importance to the seasonal characteristics of stalagmite δ13C, and taking full advantage of its potential in the indication of local environmental events. The use of multi-proxy and multi-method will contribute to better under- standing the interesting linkages among theδ13C characteristics, karstic process, global carbon cycle and associated climate change.