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为了研究芙蓉洞滴水和池水中溶解无机碳碳同位素(DIC-δ~(13)C)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CO_2浓度和洞内空气CO_2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DIC-δ~(13)C平均值为-8.98‰,两个池水点的DIC-δ~(13)C平均值为-6.98‰,池水的DIC-δ~(13)C比滴水的重2‰。对应2013年7月的干旱气候,洞穴水DIC-δ~(13)C在10月相应出现明显偏重值,偏轻的DIC-δ~(13)C值则是对湿润气候的滞后响应。洞穴水的DIC-δ~(13)C变化对地表气候的响应具有明显的滞后期。洞穴水DIC-δ~(13)C主要受土壤CO_2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DIC-δ~(13)C造成一定的影响。研究结果表明在短时间尺度上,洞穴水DIC-δ~(13)C变化响应了当地降水量以及地表湿润状况的变化。
In order to study the characteristics and influencing factors of dissolved inorganic carbon and carbon isotopes (DIC-δ ~ (13) C) in Furong Cave drip and water, and to indicate the significance of climate and climate, Furong Cave was carried out from May 2013 to May 2014 Cave monitoring. The results showed that the CO 2 concentration in mountainous soil and the air CO_2 concentration in Furong Mountain showed obvious seasonal variation. The concentration in summer was high and the concentration in winter was low, which was affected by both temperature and precipitation. The average DIC-δ13C of 5 drip points in Furong Cave is -8.98 ‰, and the average value of DIC-δ13C in the two ponds is -6.98% ) C than the drip weight 2 ‰. Corresponding to the July 2013 arid climate, DIC-δ ~ (13) C in cave water shows a corresponding bias value in October, while the light DIC-δ ~ (13) C value is a lag response to humid climate. The response of DIC-δ ~ (13) C in the cave water to the surface climate has a significant lag period. The cave water DIC-δ ~ (13) C is mainly affected by soil CO_2, and bedrock dissolution and the opening of aeration zone also affect DIC-δ ~ (13) C in cave water. The results show that on a short time scale, the variation of DIC-δ ~ (13) C in cave water responds to the variation of local precipitation and surface wetness.