Exogenous inputs and biological consumption regulate nitrate concentrations and fluxes in a river-groundwater-reservoir continuum
文献类型：期刊论文
| 作者 | Wang, Jing1,4; Zhong, Lixiang1,4; Li, Xinde1,2; Wen, Xuefa1,2,3,4 |
| 刊名 | JOURNAL OF HYDROLOGY
 |
| 出版日期 | 2026-05-01 |
| 卷号 | 670页码:135223 |
| 关键词 | River-groundwater-reservoir continuum Multiple isotopes Exogenous N source Hydrological pathway Nitrogen transformation |
| ISSN号 | 0022-1694 |
| DOI | 10.1016/j.jhydrol.2026.135223 |
| 产权排序 | 1 |
| 文献子类 | Article |
| 英文摘要 | Nitrate pollution threatens human health and aquatic ecosystems, requiring strict control in critical drinking-water sources like reservoirs and lakes. However, the regulation of nitrate concentrations and fluxes by exogenous inputs, hydrological transport, and transformations within river-groundwater-reservoir/lake continua remains unclear. To address this, we sampled and analyzed multiple isotopes and water quality indices in river, groundwater, and reservoir water in the Miyun Reservoir basin - Beijing's primary drinking-water source. Results showed that nitrate constituted >90% of dissolved inorganic nitrogen across all water types, exceeding the water-quality target (<= 1 mg L-1) in >70% of reservoir and >90% of upstream river and groundwater samples. Exogenous inputs, hydrological pathways, and biological transformations showed coherent seasonal dynamics. Bayesian isotope mixing models revealed that manure and sewage were the dominant external nitrate sources, their contributions regulated by land use rather than runoff. The correlation between delta O-18-H2O and delta O-18-NO3- confirmed that nitrate originated predominantly from in-situ nitrification of external nitrogen. Integrated SWAT model and isotopic-chemical signatures further revealed that external nitrogen primarily entered river via interflow and groundwater (>99% of river discharge). Denitrification (delta N-15/delta O-18 Slope = 0.5-1.0) was the primary nitrate removal process in rivers and groundwaters, generating a mid-reach nitrate peak due to its increasing dominance over cumulative inputs. In the reservoir, assimilation (delta N-15/delta O-18 slope = 1.41) dominated nitrate pathway, sequestering 57.8% of the nitrogen load. Although biological process reduced exogenous nitrate transport to the reservoir, high baseflow continuously delivered legacy nitrogen from subsurface, sustaining elevated riverine nitrate levels and presenting ongoing management challenges for the Miyun Reservoir. |
| URL标识 | 查看原文 |
| WOS关键词 | DUAL-ISOTOPE ; NITROGEN ; MODEL ; FRACTIONATION ; APPORTIONMENT ; ASSIMILATION ; DELTA-N-15 |
| WOS研究方向 | Engineering ; Geology ; Water Resources |
| 语种 | 英语 |
| WOS记录号 | WOS:001707843600001 |
| 出版者 | ELSEVIER |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/221270]  |
| 专题 | 生态系统网络观测与模拟院重点实验室_外文论文 |
| 通讯作者 | Wen, Xuefa |
| 作者单位 | 1.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 101408, Peoples R China; 2.Univ Chinese Acad Sci, Beijing Yanshan Earth Crit Zone Natl Res Stn, Beijing 101408, Peoples R China 3.Nanjing Univ Informat Sci & Technol, Collaborat Innovat Ctr Forecast & Evaluat Meteorol, Nanjing 210044, Peoples R China; 4.Chinese Acad Sci, Key Lab Ecosyst Network Observat & Modeling, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China; |
| 推荐引用方式 GB/T 7714 | Wang, Jing,Zhong, Lixiang,Li, Xinde,et al. Exogenous inputs and biological consumption regulate nitrate concentrations and fluxes in a river-groundwater-reservoir continuum[J]. JOURNAL OF HYDROLOGY,2026,670:135223. |
| APA | Wang, Jing,Zhong, Lixiang,Li, Xinde,&Wen, Xuefa.(2026).Exogenous inputs and biological consumption regulate nitrate concentrations and fluxes in a river-groundwater-reservoir continuum.JOURNAL OF HYDROLOGY,670,135223. |
| MLA | Wang, Jing,et al."Exogenous inputs and biological consumption regulate nitrate concentrations and fluxes in a river-groundwater-reservoir continuum".JOURNAL OF HYDROLOGY 670(2026):135223. |
入库方式： OAI收割
来源：地理科学与资源研究所
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