| 会仙岩溶湿地地下水主要离子特征及成因分析 |
| 摘要点击 2407 全文点击 710 投稿时间：2020-09-03 修订日期：2020-09-21 |
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| 中文关键词 会仙岩溶湿地 地下水 水化学 污染 离子成因 |
| 英文关键词 Huixian karst wetland groundwater hydrochemistry pollution ionic factor |
| 作者 | 单位 | E-mail | | 李军 | 中国地质科学院岩溶地质研究所, 自然资源部/广西岩溶动力学重点实验室, 桂林 541004
河北建筑工程学院河北省水质工程与水资源综合利用重点实验室, 张家口 075000
联合国教科文组织国际岩溶研究中心, 桂林 541004 | lipsgeology@karst.ac.cn | | 邹胜章 | 中国地质科学院岩溶地质研究所, 自然资源部/广西岩溶动力学重点实验室, 桂林 541004
联合国教科文组织国际岩溶研究中心, 桂林 541004 | | | 赵一 | 中国地质科学院岩溶地质研究所, 自然资源部/广西岩溶动力学重点实验室, 桂林 541004
联合国教科文组织国际岩溶研究中心, 桂林 541004 | | | 赵瑞科 | 河北省地质矿产开发局第九地质大队, 邢台 054000 | | | 党志文 | 河北建筑工程学院河北省水质工程与水资源综合利用重点实验室, 张家口 075000 | | | 潘民强 | 河北省张家口生态环境监测中心, 张家口 075000 | | | 朱丹尼 | 中国地质科学院岩溶地质研究所, 自然资源部/广西岩溶动力学重点实验室, 桂林 541004
联合国教科文组织国际岩溶研究中心, 桂林 541004 | zdanni16@karst.ac.cn | | 周长松 | 中国地质科学院岩溶地质研究所, 自然资源部/广西岩溶动力学重点实验室, 桂林 541004
联合国教科文组织国际岩溶研究中心, 桂林 541004
中国矿业大学环境与测绘学院, 徐州 221116 | changsongzhou@karst.ac.cn |
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| 中文摘要 |
| 以我国最大的低海拔岩溶湿地会仙岩溶湿地为研究区，对该区丰水期、平水期和枯水期共采集的27组地下水样品中常规离子进行检测和分析，在分析会仙岩溶湿地地下水主要离子化学特征和不同时期变化基础上，运用单指标污染标准指数法对不同时期地下水进行污染评价，利用多元统计、Gibbs模型和离子比例关系识别地下水主要离子成因.结果表明，研究区内岩溶地下水主要为弱碱性淡水，Ca2+和HCO3-为优势离子.不同时期地下水主要离子总浓度顺序为：平水期 > 丰水期 > 枯水期，枯水期水质优于丰水期和平水期.地下水中K+和NO3-主要受含水层空间分布差异影响，Mg2+、SO42-、NO2-、NH4+和TDS受时空尺度综合作用，Na+、Ca2+、HCO3-和Cl-为水体中较稳定离子.受碳酸盐岩控制，丰水期、平水期和枯水期地下水化学类型具有高度一致性，HCO3-Ca水占比分别为77.78%、77.78%和88.89%.地下水主要受SO42-、NO3-和NO2-污染，NO3-出现极严重程度污染样点，SO42-在丰水期和平水期出现较重污染样点.地下水化学组分主要受水岩作用控制，Ca2+和HCO3-主要来源于方解石风化溶解，少量水点受白云岩、白云质灰岩及硫铁矿控制导致Mg2+和SO42-浓度偏高，K+、Na+、SO42-、NO3-和Cl-部分来源于大气降水，Na+和Cl-部分来源于当地居民生活，K+与种植施用的钾肥相关，NO3-主要来源是化学肥料. |
| 英文摘要 |
| To investigate the major ionic chemical characteristics and seasonal variations, 27 groundwater samples were collected from the wet season, flat season, and dry season during 2018-2019 in the Huixian Karst wetland, which is the largest low-altitude karst wetland in China. The single pollution standard index was applied to evaluate the groundwater pollution during different periods, and the major ionic factors of the karst groundwater were analyzed using the statistical analysis method, Gibbs diagram, and ion ratio. The results revealed that the groundwater samples were a weakly alkaline fresh water that were rich in Ca2+ and HCO3-. The average concentrations of the primary ions followed the order of flat season > wet season > dry season; meanwhile, the water quality in the dry season was better than that in the wet and flat seasons. The K+ and NO3- in the karst groundwater were mostly affected by the spatial distributions of the aquifers, and the Mg2+, SO42-, NO2-, NH4+, and TDS were related to the space-season scale. Na+, Ca2+, HCO3-, and Cl- were relatively stable ions in the karst groundwater. The hydrochemical characteristics were primarily determined by carbonate rock dissolution and were found to be the HCO3-Ca type, which accounted for 77.78%, 77.78%, and 88.89% in the wet season, flat season, and dry season, respectively. The karst groundwater was predominantly polluted by SO42-, NO3-, and NO2-; particularly, NO3- exhibited serious pollution points, and SO42- had heavy pollution points in the wet and flat seasons. The chemical composition of the karst groundwater was controlled mostly by water-rock interactions. Ca2+ and HCO3- primarily came from calcite dissolution, and the high concentrations of Mg2+ and SO42- in a few number of points were controlled by dolomite, dolomitic limestone, and pyrite. K+, Na+, SO42-, NO3-, and Cl- partly came from atmospheric precipitation, and Na+ and Cl- partly came from human activities; K+ was related to potash fertilizer, and the main source of NO3- was chemical fertilizer. |
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