Source apportionment of nitrate in the Pearl River Estuary using delta 15N and delta 18O values and isotope mixing model

文献类型： 外文期刊

第一作者： Long, Ran

作者： Long, Ran;Tian, Fei;Zhou, Yan-bo;Li, Yi-tong;Tang, Hai-wei;Chen, Hai-gang;Long, Ran;Chen, Jian-hua;Li, Xue-fei;Chen, Hai-gang;Zhou, Yan-bo

作者机构：

关键词： Pearl River Estuary; Nitrate source; Stable isotopes; SIAR model

期刊名称：MARINE POLLUTION BULLETIN （ 影响因子：5.8； 五年影响因子：6.5 ）

ISSN： 0025-326X

年卷期： 2023 年 191 卷

页码：

收录情况： SCI

摘要： The mitigation of eutrophication in the Pearl River Estuary (PRE) has encountered numerous challenges in regards to source control. Herein, the isotope mixing model (SIAR) was used to quantify the primary nitrate sources in the PRE. The results showed that the nitrate levels were significantly higher in the high-flow season than in the low-flow season. Meanwhile, we found the most important nitrate sources were manure and sewage during the high-flow season, with a contribution ratio of 47 % in the low salt area (LSA) and 29 % in the high salt area (HSA). During the low-flow season, the primary nitrate sources were identified as reduced nitrogen fertilizer in the LSA and manure and sewage in the HSA, which accounted for 52 % and 44 %, respectively. Furthermore, we also suggest that a feasible measure might be to control the pollution caused in the PRE by manure and sewage as well as reduced nitrogen fertilizer.

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