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中文摘要：
引用地球化学敏感指数与敏感等值线的概念,对重庆雪玉洞地下河2010年9月～2011年8月的水化学数据进行分析,发现地下河水的化学成分受上覆基岩的控制,表现出高Ca2＋、低Mg2＋的特征,但受季风降雨的影响,水化学在旱、雨季存在较大差异：雨季各监测点[Mg2＋]/[Ca2＋]（摩尔比）为0.018～0.051,旱季[Mg2＋]/[Ca2＋]为0.038～0.064,雨季要小于旱季;[HCO3-]/[SO42-]（摩尔比）雨季为4.86～36.62,旱季为6.23～46.67,表现出高HCO3-低SO24-的特点.岩溶作用的季节性变化使得HCO3-、Ca2＋成为最敏感的阴阳离子.由于岩溶区特殊的水文地质结构,雨水、地表水、地下水转化迅速,致使地下河对农业活动较为敏感,其中以Cl-、NO3-最为突出,敏感指数分别为0.286、0.022,在保护岩溶水资源时应引起重视.旅游活动对地下河的影响较小,主要与景区良好的管理有关,应提倡相关景区向其学习管理经验.做好地下河补给区的岩溶生态系统的管理工作,可发挥岩溶区地下河最大的经济与环境效益.
英文摘要：
Quoted geochemical susceptivity index and isosensitive line on geochemical susceptivity,analyzed the data of underground rivers of Xueyu Cave in Chongqing from September 2010 to August 2011,we found that the chemical composition of the underground river was controlled by the bedrock,due to the composition of high concentration of Ca2＋ and low concentration of Mg2＋.Owing to the effects of the monsoon,water chemistry was different between drought season and rainy season： the value of / was 0.018-0.051 in the rainy season,but in dry season the value was 0.038-0.064.The value of / was 4.86-36.62 in the rainy season,and 6.23-46.67 in the dry season.The seasonal change of Karstification made Ca2＋ and HCO3- become the most sensitive ion.As a result of the special hydrogeological structure in Karst area,rain,surface water and groundwater transformed rapidly,which caused the underground river was sensitive to agricultural activities,especially for Cl- and NO-3,and their sensitive indices were 0.286 and 0.022 respectively.The influence of tourism activities on the underground river was less than the management.The management work of ecological system should be strengthen in the recharge area,thus the largest economic and environmental benefits in the Karst area could be achieved.
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Sources and migration path of chemical compositions in a karst groundwater system during rainfall ev
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