| 基于IsoSource的桂林寨底地下河硝酸盐来源定量研究 |
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| 关键词:nitrogen and oxygen isotopes underground river sources of nitrate IsoSource quantitative calculation |
| 基金项目:国家自然科学基金(编号: 400772164);中国地质调查局地质调查项目(编号: 1212011121164);国家环境保护公益性行业科研专项项目(编号: 2013A035);中国地质科学院岩溶地质研究所基本科研业务费项目(编号: 2012014; 201309) |
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| A Quantitative Study of the Sources of Nitrate of Zhaidi Underground River in Guilin Based on IsoSource |
| In recent years, with the extensive use of chemical fertilizers and pesticides, nitrate contamination in groundwater has become more and more serious with each passing day. Choosing the Zhaidi underground River of Guilin as a study area, the authors analyzed the nitrogen and oxygen isotopes and investigated hydrochemistry for groundwater. This study can provide a new method for quantitative study of groundwater sources of nitrate in the karst area. IsoSource software was used to calculate the sources of nitrate quantitatively. The results show that the nitrate is dominated by NO3–, the NO3– concentrations are in the range of 2.67~17.99 mg/L, 6.3 mg/L on average. The sources of nitrate in the study area are animal waste and sewage, fertilizer, and soil organic nitrogen, with fertilizer, animal waste and sewage, and soil organic matter possessing 23%~78%, 6%~58%, and 6%~38% respectively. In the direction of groundwater flow, the proportions of fertilizer and animal waste and sewage vary significantly, closely related to the distance from the residential area. The longer the distance, the larger the proportion of the fertilizer, and the smaller the proportion of the animal waste and sewage. |
| LU Li,LI Wen-li,PEI Jian-guo,WANG Zhe.2014.A Quantitative Study of the Sources of Nitrate of Zhaidi Underground River in Guilin Based on IsoSource[J].Acta Geoscientica Sinica,35(2):248-254. |
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