| 十堰城区地表水-地下水水化学特征及硝酸盐来源 |
| 摘要点击 1181 全文点击 185 投稿时间：2024-01-23 修订日期：2024-04-11 |
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| 中文关键词 水化学特征 硝酸盐 氮氧同位素 贝叶斯稳定同位素混合模型（SIMMR） 源解析 |
| 英文关键词 hydrochemical characteristics nitrate nitrogen and oxygen isotopes stable isotope mixing model in R（SIMMR） source resolution |
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| 中文摘要 |
| 水体硝酸盐污染是世界性的环境问题,识别硝酸盐来源对保障水资源可持续利用具有重要意义. 利用多种水化学指标与硝酸盐氮氧同位素（δ15N-NO3-和δ18O-NO3-）对十堰水体水化学特征进行分析,识别水体中硝酸盐来源,并利用SIMMR模型计算水体硝酸盐不同污染来源的贡献率. 结果表明,研究区地表水及地下水的水化学类型以HCO3-Ca·Mg型为主,水体中硝酸盐的形成主要受硝化作用影响,反硝化作用不明显. 水体中硝酸盐的主要来源为大气沉降、化肥、土壤氮、粪便和污水. SIMMR模型输出结果显示,粪便和污水、大气沉降、化肥和土壤氮对研究区地表水硝酸盐的贡献率分别为43.1%、2.2%、43.3%和11.4%,对地下水硝酸盐的贡献率分别为37.2%、9.4%、28.3%和25.1%,地表水硝酸盐的主要污染源是化肥、粪便和污水,地下水硝酸盐的主要污染源是粪便和污水. |
| 英文摘要 |
| Nitrate pollution in water bodies is a worldwide environmental problem, and identifying the sources of nitrate is of great significance to guarantee the sustainable use of water resources. A variety of water chemistry indicators and nitrate nitrogen and oxygen isotopes （δ15N-NO3- and δ18O-NO3-） were used to analyze the water chemistry characteristics of water bodies in Shiyan to identify the sources of nitrate in the water bodies and to calculate the contribution rate of nitrate from different pollution sources of the water bodies using the SIMMR model. The results showed that the hydrochemical types of surface water and groundwater in the study area were dominated by the HCO3-Ca·Mg type, and the formation of nitrate in the water body was mainly affected by nitrification, with non-obvious denitrification. The main sources of nitrate in water bodies were atmospheric deposition, chemical fertilizers, soil nitrogen, feces, and sewage. SIMMR model outputs showed that feces and sewage, atmospheric deposition, chemical fertilizer, and soil nitrogen contributed 43.1%, 2.2%, 43.3%, and 11.4% to nitrate in surface water and 37.2%, 9.4%, 28.3%, and 25.1%, respectively, to nitrate in groundwater in the study area. The main sources of surface water nitrate were fertilizer, feces and sewage, whereas the main sources of groundwater nitrate were manure and sewage. |
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