Extreme rainfall intensifies nitrogen responses through baseflow in arid and semi-arid river basins
文献类型：期刊论文
| 作者 | Dou, Jinghui1,3,5; Xia, Rui3,5; Tang, Zixuan4; Huang, Zhen4; Jiang, Xiaohui1; Zhang, Kai3,5; Li, Lina2,5; Yan, Chao1,3,5 |
| 刊名 | JOURNAL OF HYDROLOGY
 |
| 出版日期 | 2026-05-01 |
| 卷号 | 671页码:135306 |
| 关键词 | Extreme rainfall Baseflow Nitrogen pollution Yellow River Basin Hydrological pathways Landscape pattern |
| ISSN号 | 0022-1694 |
| DOI | 10.1016/j.jhydrol.2026.135306 |
| 产权排序 | 4 |
| 文献子类 | Article |
| 英文摘要 | Extreme rainfall (ER) is intensifying under climate change, providing episodic water resources for arid and semiarid regions while simultaneously enhancing the widespread mobilization of pollutants and associated non-point source pollution risks. However, the regulatory mechanisms by which different hydrological components, particularly quickflow and baseflow, control nitrogen dynamics under ER remain poorly understood. In this study, we investigate the hydrological controls on total nitrogen (TN) concentrations at the daily scale in the Yellow River Basin, a globally representative large arid and semi-arid watershed. A distributed hydrological model (Wflow_hbv) was coupled with random forest-based interpretable machine learning to disentangle the impacts of rainfall-runoff processes on TN responses under ER. Results show that: (1) ER has significantly altered the composition of runoff in the Yellow River Basin. The contribution of quickflow increases markedly from 22.5% during non-extreme rainfall (NER) to 32.8% during extreme events, while baseflow remains a dominant component of total runoff. Concurrently, TN concentrations increase at 61% of monitoring stations. (2) Hydrological and water quality responses exhibit clear temporal asynchrony: quickflow responds in a pulse-like manner, peaking on the second day after rainfall, whereas TN responses are dominated by a first-flush effect with a short lag time of 0-1 day. (3) Under ER, baseflow emerges as the most influential hydrological factor controlling TN concentrations, contributing 14.04% to TN variability. A distinct baseflow threshold is identified (0.92 mm), below which baseflow exerts a dilution effect on TN, whereas exceeding this threshold leads to groundwater table rise and the mobilization of soluble nitrogen stored in the vadose zone into river channels, thereby accelerating nitrogen pollution. Landscape configuration further modulates this process, as highly aggregated grassland patterns (G_AI >= 93.83%) exhibit favorable water retention and pollutant interception capacities, making the relatively clean baseflow in such areas more sensitive to the source effect triggered by the rise in groundwater level. This study reveals a cascade mechanism linking landscape configuration, hydrological pathways, and nitrogen pollution under ER, demonstrating how altered hydrological pathways amplify nitrogen pollution risks in large arid and semi-arid river basins. |
| URL标识 | 查看原文 |
| WOS关键词 | CLIMATE-CHANGE ; RANDOM FOREST ; PREDICTION ; FREQUENCY ; INDEXES ; EVENTS ; RUNOFF |
| WOS研究方向 | Engineering ; Geology ; Water Resources |
| 语种 | 英语 |
| WOS记录号 | WOS:001722375100001 |
| 出版者 | ELSEVIER |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/221178]  |
| 专题 | 陆地水循环及地表过程院重点实验室_外文论文 |
| 通讯作者 | Xia, Rui |
| 作者单位 | 1.Northwest Univ, Coll Urban & Environm Sci, Xian 710127, Peoples R China; 2.Zhengzhou Univ, Sch Water Conservancy Sci & Engn, Zhengzhou 450001, Peoples R China 3.Chinese Res Inst Environm Sci, Natl Joint Res Ctr Ecol Conservat & High Qual Dev, Beijing 100012, Peoples R China; 4.Chinese Acad Sci, Key Lab Water Cycle & Related Land Surface Proc, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China; 5.Chinese Res Inst Environm Sci, State Key Lab Environm Criteria & Risk Assessment, Beijing 100012, Peoples R China; |
| 推荐引用方式 GB/T 7714 | Dou, Jinghui,Xia, Rui,Tang, Zixuan,et al. Extreme rainfall intensifies nitrogen responses through baseflow in arid and semi-arid river basins[J]. JOURNAL OF HYDROLOGY,2026,671:135306. |
| APA | Dou, Jinghui.,Xia, Rui.,Tang, Zixuan.,Huang, Zhen.,Jiang, Xiaohui.,...&Yan, Chao.(2026).Extreme rainfall intensifies nitrogen responses through baseflow in arid and semi-arid river basins.JOURNAL OF HYDROLOGY,671,135306. |
| MLA | Dou, Jinghui,et al."Extreme rainfall intensifies nitrogen responses through baseflow in arid and semi-arid river basins".JOURNAL OF HYDROLOGY 671(2026):135306. |
入库方式： OAI收割
来源：地理科学与资源研究所
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