中文关键词雪玉洞洞穴滴水地球化学特征Mg/Caδ¹³C_DIC 英文关键词Xueyu Cavedrip watergeochemical featureMg/Caδ¹³C_DIC

作者	单位	E-mail
曾泽	西南大学地理科学学院, 岩溶环境重庆市重点实验室, 重庆 400715	364667193@qq.com
蒋勇军	西南大学地理科学学院, 岩溶环境重庆市重点实验室, 重庆 400715
吕现福	西南大学地理科学学院, 岩溶环境重庆市重点实验室, 重庆 400715
曾思博	西南大学地理科学学院, 岩溶环境重庆市重点实验室, 重庆 400715
胡刘婵	西南大学地理科学学院, 岩溶环境重庆市重点实验室, 重庆 400715
雷佳琪	西南大学地理科学学院, 岩溶环境重庆市重点实验室, 重庆 400715

中文摘要 为揭示不同类型的洞穴滴水水文地球化学指标季节变化特征及其对外界气候变化的响应机制，从2015年3月至2017年3月对重庆丰都雪玉洞内的4处滴水点的地球化学指标进行两年的动态监测，结果表明，4个滴水点的水化学类型主要为HCO₃^--Ca²⁺型，且常年处于沉积状态，但不同类型的滴水点在滴量及离子浓度方面差异明显；受制于基岩溶蚀作用、稀释作用、先期沉积作用（PCP）等地球化学进程，4个滴水点的Ca²⁺、Mg²⁺、HCO₃^-、EC、pH、pCO₂、SIc等地球化学指标具有显著的季节变化规律，可以很好地响应外部气候环境变化；不同类型滴水点的Mg/Ca比变化规律并不一致，这与每个滴水点的运移路径不同及PCP强度不同有关；4个滴水点的δ¹³C_DIC受到土壤CO₂浓度及水动力条件的影响，与外界气温降水量均表现出一定的相关性，但在以管道流为主的滴水点中，δ¹³C_DIC往往在短时间尺度上表现出雨量效应. 英文摘要 Geochemical indexes of drip water were monitored to unveil their seasonal variability and response mechanism to the external climate from March 2015 to March 2017 at four sites in Xueyu Cave, Chongqing municipality. The results showed that four drips show a significant difference in ion concentration and discharge despite all sites having simple HCO₃^--Ca²⁺ waters and being super-saturated with respect to calcite. Being subject to geochemical processes, such as bedrock dissolution, dilution, and prior calcite precipitation (PCP), the geochemistry indexes, such as Ca²⁺, Mg²⁺, HCO₃^-, EC, pH, pCO₂, and SIc, at the four sites showed extraordinary seasonal variations and could perfectly respond to external climate events. Due to the difference of migration pathways and PCP intension, different types of drip water had diverse seasonal variations in Mg/Ca. Affected by soil CO₂ content and hydrodynamic conditions, the δ¹³C_DIC of all sites had correlations with external temperature or precipitation. On a short time scale, the δ¹³C_DIC values reflected the precipitation amount in the site with its flow path controlled by conduit flow.

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