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Backgrounds as a potentially important component of riverine nitrate loads

文献类型：期刊论文

作者Li, Siyue2; Jiang, Hao3,4; Xu, Zhifang1; Zhang, Quanfa2,3,4
刊名SCIENCE OF THE TOTAL ENVIRONMENT
出版日期2022-09-10
卷号838页码:10
ISSN号0048-9697
关键词Nitrate Background Isotope River Nitri fication
DOI10.1016/j.scitotenv.2022.155999
英文摘要Nitrate (NO3-) is a major trigger for river eutrophication. While efforts have been made to understand the anthropogenic NO3- pollution in rivers, the role of background NO3- in determining NO3- loads remains to be studied. In this study, we used dual-isotopes (delta N-15/delta O-18-NO3-) and an isotope-mixing model to reveal the natural and anthropogenic processes regulating the NO3- loads in a forest river that acts as a headwater source for the China's South to North Water Transfer Project. Even though the basin is sparsely populated, the mean NO3--N concentration (0.6 +/- 0.2 mg/L) was much higher than the median concentration of global rivers (0.3 +/- 0.2 mg/L). Meanwhile, the delta N-15-NO(3)(- )was extremely depleted (as low as -14.4 parts per thousand). The correlations between the NO3- concentrations and isotopes indicate that the nitrification of different sources (i.e., soil organic nitrogen, chemical fertilizer, manure, and sewage) dominates the NO3- loads. Soil organic nitrogen accounted for c.a. 60% of the riverine NO3- in the high -flow season, which alone exceeds China's national standard. This finding clearly shows that highNO(3)(-) loads in rivers could not all be ascribed to direct anthropogenic inputs, and background NO3- could be critical triggers. Therefore, when evaluating the NO3- pollution of rivers, the background NO3- concentrations must be considered along with the actual NO3- loads. In the low-flow season, the contribution from manure and sewage (c.a. 34%) increases. This study highlights the potentially important role of background NO3- in regulating riverine NO3- loads, providing important implications for understanding high riverine NO3- loads worldwide.
WOS关键词DUAL-ISOTOPE APPROACH ; LAND-USE ; SOURCE IDENTIFICATION ; UNCERTAINTY ANALYSIS ; NITROGEN DEPOSITION ; WATER-QUALITY ; DENITRIFICATION ; STREAMS ; MODEL ; NITRIFICATION
资助项目National Natural Science Foundation of China[32030069] ; National Natural Science Foundation of China[42003005] ; National Natural Science Foundation of China[31670473] ; Key Program of the Chinese Academy of Sciences[ZDRW-ZS-2016-7-2]
WOS研究方向Environmental Sciences & Ecology
语种英语
出版者ELSEVIER
WOS记录号WOS:000806111000009
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Program of the Chinese Academy of Sciences ; Key Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Program of the Chinese Academy of Sciences ; Key Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Program of the Chinese Academy of Sciences ; Key Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Program of the Chinese Academy of Sciences ; Key Program of the Chinese Academy of Sciences
源URL[http://ir.iggcas.ac.cn/handle/132A11/106052]  
专题地质与地球物理研究所_中国科学院新生代地质与环境重点实验室
通讯作者Jiang, Hao; Zhang, Quanfa
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing 100029, Peoples R China
2.Wuhan Inst Technol, Inst Changjiang Water Environm & Ecol Secur, Sch Environm Ecol & Biol Engn, Engn Res Ctr Phosphorus Resources Dev,Key Lab Gree, Wuhan 430205, Peoples R China
3.Chinese Acad Sci, Ctr Plant Ecol, Core Bot Gardens, Wuhan 430074, Peoples R China
4.Chinese Acad Sci, Key Lab Aquat Bot & Watershed Ecol, Wuhan Bot Garden, Wuhan 430074, Peoples R China
推荐引用方式
GB/T 7714		 Li, Siyue,Jiang, Hao,Xu, Zhifang,et al. Backgrounds as a potentially important component of riverine nitrate loads[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2022,838:10.
APA Li, Siyue,Jiang, Hao,Xu, Zhifang,&Zhang, Quanfa.(2022).Backgrounds as a potentially important component of riverine nitrate loads.SCIENCE OF THE TOTAL ENVIRONMENT,838,10.
MLA Li, Siyue,et al."Backgrounds as a potentially important component of riverine nitrate loads".SCIENCE OF THE TOTAL ENVIRONMENT 838(2022):10.

入库方式： OAI收割

来源：地质与地球物理研究所

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