重庆芙蓉洞洞穴水DIC-δ13C的变化特征及影响因素

黄春霞; 李廷勇; 韩立银; 李俊云; 袁 娜; 王海波; 张涛涛; 赵 鑫; 周菁俐

doi:10.11932/karst20160308

重庆芙蓉洞洞穴水DIC-δ13C的变化特征及影响因素

doi: 10.11932/karst20160308

1.
西南大学地理科学学院
2.
西南大学地理科学学院/中国地质科学院岩溶地质研究所/国土资源部、广西壮族自治区岩溶动力学重点实验室/国土资源部岩溶生态环境—重庆南川野外基地

基金项目: 国家自然科学基金项目(41172165, 41302138, 41440020)；中央高校基本科研业务费专项资金项目(XDJK2013A012, XDJK2014C010)；岩溶动力学重点实验室开放基金资助课题(KDL201301)和西南大学博士基金项目(SWU114022)

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出版历程
- 发布日期: 2016-06-25

Variations of cave water DICδ13C and its influencing factors in Furong cave, Chongqing

1.
School of Geographical Sciences, Southwest University
2.
School of Geographical Sciences, Southwest University/Institute of Karst Geology, CAGS / Key Laboratory of Karst Dynamics , MLR & GZAR/Field Scientific Observation & Research Base of Karst Eco-environments at Nanchuan in Chongqing, Ministry of Land and Resources of China

摘要

摘要: 为了研究芙蓉洞滴水和池水中溶解无机碳碳同位素(DICδ13C)的变化特征、影响因素及其气候环境指示意义，于2013年5月-2014年5月对芙蓉洞进行了洞穴监测。结果显示芙蓉洞山体土壤CO2浓度和洞内空气CO2浓度均表现出明显的季节变化特征，夏半年浓度偏高，冬半年浓度偏低，受温度和降水量的共同影响。芙蓉洞5个滴水点的DICδ13C平均值为-8.98 ‰，两个池水点的DICδ13C平均值为-6.98 ‰，池水的DICδ13C比滴水的重2 ‰。对应2013年7月的干旱气候，洞穴水DICδ13C在10月相应出现明显偏重值，偏轻的DICδ13C值则是对湿润气候的滞后响应。洞穴水的DICδ13C变化对地表气候的响应具有明显的滞后期。洞穴水DICδ13C主要受土壤CO2的影响，基岩溶解作用、包气带的开放性等因素也会对洞穴水DICδ13C造成一定的影响。研究结果表明在短时间尺度上，洞穴水DICδ13C变化响应了当地降水量以及地表湿润状况的变化。
- 洞穴水DICδ13C /
- 土壤CO2浓度 /
- 水化学特征 /
- 温度和降水 /
- 芙蓉洞
Abstract: To explore the variation characteristics of DICδ13C in the drip water and pool water in Furong cave, Chongqing, their influencing factors, and their impact on climate, the cave had been monitored from May 2013 to May 2014. The results showed that the CO2 concentration for both the soil air and cave air was high in summer and low in winter, which displayed significantly seasonal variations. They were affected by the combined effects of temperature and precipitation. The average DICδ13C value of the drip waters from five monitoring sites was -8.98‰, while the average DICδ13C value of the pool waters from two monitoring sites was -6.98‰, showing that the DICδ13C value of pool water was 2‰ heavier than that of the drip water. Corresponding to the arid climate in July 2013, the DICδ13C of cave water became heavier in October, while the light DICδ13C values indicated the delayed response to the humid climate. The DICδ13C of cave water showed a significant lag period to respond the climate change. The DICδ13C was dominantly affected by the soil CO2, also by bedrock dissolution, prior calcite precipitation and the opening degree of vadose zone. Our study demonstrates that on short time scales, the variations of DICδ13C of the drip water in Furong cave respond to the changes of local precipitation and the humidity conditions overlying the cave.
- DICδ13C of cave water /
- soil CO2 /
- concentration /
- water chemical characteristics /
- temperature and precipitation

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