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| DOI | 10.1016/jjes.2024.02.012 |
| Rainfall impacts on nonpoint nitrogen and phosphorus dynamics in an agricultural river in subtropical montane reservoir region of southeast China | |
| 发表日期 | 2025 |
| ISSN | 1001-0742 |
| EISSN | 1878-7320 |
| 起始页码 | 149 |
| 卷号 | 149 |
| 英文摘要 | The increased frequency and intensity of heavy rainfall events due to climate change could potentially influence the movement of nutrients from land -based regions into recipient rivers. However, little information is available on how the rainfall affect nutrient dynamics in subtropical montane rivers with complex land use. This study conducted high -frequency monitoring to study the effects of rainfall on nutrients dynamics in an agricultural river draining to Lake Qiandaohu, a montane reservoir of southeast China. The results showed that riverine total nitrogen (TN) and total phosphorus (TP) concentrations increased continuously with increasing rainfall intensity, while TN:TP decreased. The heavy rainfall and rainstorm drove more than 30% of the annual N and P loading in only 5.20% of the total rainfall period, indicating that increased storm runoff is likely to exacerbate eutrophication in montane reservoirs. NO3- -N is the primary nitrogen form lost, while particulate phosphorus (PP) dominated phosphorus loss. The main source of N is cropland, and the main source of P is residential area. Spatially, forested watersheds have better drainage quality, while it is still a potential source of nonpoint pollution during rainfall events. TN and TP concentrations were significantly higher at sites dominated by cropland and residential area, indicating their substantial contributions to deteriorating river water quality. Temporally, TN and TP concentrations reached high values in May -August when rainfall was most intense, while they were lower in autumn and winter than that in spring and summer under the same rainfall intensities. The results emphasize the influence of rainfall -runoff and land use on dynamics of riverine N and P loads, providing guidance for nutrient load reduction planning for Lake Qiandaohu. (c) 2024 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V. |
| 英文关键词 | Non-point source pollution; Rainfall events; Land use type; Mountain area; Deepwater reservoir |
| 语种 | 英语 |
| WOS研究方向 | Environmental Sciences & Ecology |
| WOS类目 | Environmental Sciences |
| WOS记录号 | WOS:001224004400001 |
| 来源期刊 | JOURNAL OF ENVIRONMENTAL SCIENCES
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| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/304041 |
| 作者单位 | Chinese Academy of Sciences; Nanjing Institute of Geography & Limnology, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Nanjing University; University of North Carolina; University of North Carolina Chapel Hill |
| 推荐引用方式 GB/T 7714 | . Rainfall impacts on nonpoint nitrogen and phosphorus dynamics in an agricultural river in subtropical montane reservoir region of southeast China[J],2025,149. |
| APA | (2025).Rainfall impacts on nonpoint nitrogen and phosphorus dynamics in an agricultural river in subtropical montane reservoir region of southeast China.JOURNAL OF ENVIRONMENTAL SCIENCES,149. |
| MLA | "Rainfall impacts on nonpoint nitrogen and phosphorus dynamics in an agricultural river in subtropical montane reservoir region of southeast China".JOURNAL OF ENVIRONMENTAL SCIENCES 149(2025). |
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