Nitrate sources and transformations along the Yangtze river and its changes after strict environmental regulation
文献类型：期刊论文
| 作者 | Zhang, Jun4,5; Wei, Rongfei5; Zerizghi, Teklit4,5; Wang, Ziteng4,5; Cui, Meng3; Du, Chenjun4,5; Yue, Fujun2; Guo, Qingjun1,5 |
| 刊名 | JOURNAL OF HYDROLOGY
 |
| 出版日期 | 2023-02-01 |
| 卷号 | 617页码:9 |
| 关键词 | Nitrate Dual stable isotopes Spatiotemporal pattern Nitrate transformation Yangtze River |
| ISSN号 | 0022-1694 |
| DOI | 10.1016/j.jhydrol.2022.129037 |
| 通讯作者 | Guo, Qingjun(guoqj@igsnrr.ac.cn) |
| 英文摘要 | The exploration of the sources and fate of nitrate in surface waters along with the evaluation of the imple-mentation of environmental regulations is essential for preventing and remediating the serious problem of nitrate pollution. However, the nitrate sources and transformations in the Yangtze River and its changes after strict environmental regulation remain unclear. In this pursuit, the present study investigated the spatiotemporal variations of the nitrate source and transformations in the Yangtze River by determining the nitrate isotopic compositions ( delta N-15-NO3 & macr;and delta O-18-NO3 & macr;) and water chemistry during the wet and dry seasons. Furthermore, the current measurements of the nitrate sources and transformations after the environmental regulations were compared to the historical records in 2006. The results showed that the NO3 & macr;-N concentration gradually increased along the river, similar to that in 2006. However, the spatial pattern of delta N-15 and delta O-18 of NO3 & macr; values obviously changed after the environmental regulations. It was found that the delta N-15-NO3 & macr;values increased from the head-water to the lower stream, which can be due to assimilation of phytoplankton. The delta O-18-NO3 & macr;values showed a gradual decrease in the headwater area, an increase at the upper stream, and stabilized in the middle and lower stream. In addition, the delta O-18-NO3 & macr; value was significantly higher during the wet season than in the dry season (P < 0.05). However, there was no significant seasonal difference in NO3 & macr; -N concentrations, delta N-15-NO3 & macr; value, and nitrate source and transformations. The results of source apportionment indicated that the dominated nitrate source changed from the manure and sewage to soil N after the implementation of the environmental regulations. However, the major nitrate transformations were not affected by the environmental regulations and nitrification was still prevalent in the Yangtze River watershed. The change of the dominated nitrate source validated the effectiveness of the environmental regulation; however, the increase in the nitrate concentration reflected the heavy inputs of residual nitrate from the watershed. This study identified the nitrate sources and transformation processes and its changes after strict environmental regulations, and provided significant information for adjusting and formulating new policies to further control the nitrate pollution. |
| 资助项目 | China?s National Natural Science Foundation[41890824] ; China?s National Natural Science Foundation[41890822] ; China?s National Natural Science Foundation[41625006] ; China?s National Natural Science Foundation[41761144066] ; China?s National Natural Science Foundation[41561144005] |
| WOS研究方向 | Engineering ; Geology ; Water Resources |
| 语种 | 英语 |
| WOS记录号 | WOS:000929457800001 |
| 出版者 | ELSEVIER |
| 资助机构 | China?s National Natural Science Foundation |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/190099]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Guo, Qingjun |
| 作者单位 | 1.11A Datun Rd, Beijing 100101, Peoples R China 2.Tianjin Univ, Inst Surface Earth Syst Sci, Tianjin 300072, Peoples R China 3.Natl Marine Data & Informat Serv, Tianjin 300171, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 5.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, Jun,Wei, Rongfei,Zerizghi, Teklit,et al. Nitrate sources and transformations along the Yangtze river and its changes after strict environmental regulation[J]. JOURNAL OF HYDROLOGY,2023,617:9. |
| APA | Zhang, Jun.,Wei, Rongfei.,Zerizghi, Teklit.,Wang, Ziteng.,Cui, Meng.,...&Guo, Qingjun.(2023).Nitrate sources and transformations along the Yangtze river and its changes after strict environmental regulation.JOURNAL OF HYDROLOGY,617,9. |
| MLA | Zhang, Jun,et al."Nitrate sources and transformations along the Yangtze river and its changes after strict environmental regulation".JOURNAL OF HYDROLOGY 617(2023):9. |
入库方式： OAI收割
来源：地理科学与资源研究所
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