| 降雨条件下岩溶地下水微量元素变化特征及其环境意义 |
| 摘要点击 2702 全文点击 1527 投稿时间：2013-04-15 修订日期：2013-07-20 |
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| 中文关键词 微量元素 降雨 岩溶地下水 土壤流失 水质 |
| 英文关键词 trace element rainfall karst groundwater soil erosion water quality |
| 作者 | 单位 | E-mail | | 陈雪彬 | 西南大学地理科学学院, 三峡库区生态环境教育部重点实验室, 重庆 400715
国土资源部岩溶生态环境-重庆南川野外基地, 重庆 408435 | jiaju-forever@163.com | | 杨平恒 | 西南大学地理科学学院, 三峡库区生态环境教育部重点实验室, 重庆 400715
国土资源部岩溶生态环境-重庆南川野外基地, 重庆 408435 | balance@swu.edu.cn | | 蓝家程 | 西南大学地理科学学院, 三峡库区生态环境教育部重点实验室, 重庆 400715
国土资源部岩溶生态环境-重庆南川野外基地, 重庆 408435 | | | 莫雪 | 西南大学地理科学学院, 三峡库区生态环境教育部重点实验室, 重庆 400715
国土资源部岩溶生态环境-重庆南川野外基地, 重庆 408435 | | | 师阳 | 西南大学地理科学学院, 三峡库区生态环境教育部重点实验室, 重庆 400715
国土资源部岩溶生态环境-重庆南川野外基地, 重庆 408435 | |
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| 中文摘要 |
| 对降雨期间青木关岩溶地下河水的化学特征进行连续监测，获取了Ba、Sr、Fe、Mn、Al这5种微量元素及其他常量元素质量浓度的高分辨率数据. 运用相关性分析和浓度变化曲线分析微量元素来源及其迁移路径，并结合流域地质背景探讨地下河微量元素变化特征的形成过程. 研究发现，Ba和Sr元素为碳酸盐岩溶解的产物，储存于岩石裂隙、孔隙等介质中，经扩散作用进入地下河，质量浓度变化较小；而Fe、Mn、Al均来源于土壤，其中Fe、Al元素主要通过落水洞直接进入地下河，而Mn则通过土壤-岩石多孔介质补给地下河，三者浓度变化很大，对降雨响应强烈. 结果表明，5种微量元素质量浓度均低于 1 mg·L-1，Fe、Mn、Al元素最高质量浓度均超过饮用水限值. 地下 河Al、Fe元素质量浓度变化在一定程度上指示着水土流失和水质变化状况，因此有必要加强落水洞附近的环境保护和治理，从源头控制污染源. |
| 英文摘要 |
| Chemical dynamics of Qingmuguan karst groundwater system were continuously monitored during the rainfall events. A series of high-resolution concentrations data on trace elements, such as barium, strontium, iron, manganese, aluminum, and other major elements were acquired. Correlation analysis and analysis of concentration curve were employed to identify the sources and migration path of the trace elements. And the formation process of trace elements in groundwater was discussed with the geological background of underground river basin. Research shows that barium and strontium derived from carbonate dissolution appeared to be stored in features such as fissures and pores. These two ions were recharged into the underground river by diffusion during precipitation, which resulted in small changes in the their concentration. However total iron, total manganese and aluminum derived from soil erosion varied relatively widely with strong response to rainfall, attributing to the migration of total iron and aluminum with overland flow to recharge the subterranean river directly via sinkholes while total manganese via soil-rock porous media. The results showed that concentrations of all the five trace elements were below 1 mg·L-1, and the highest concentrations of total iron, total manganese and aluminum exceeded the limit of drinking water. To some extent, the concentrations of total iron and aluminum may be an indicator for soil erosion and water quality. |
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