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Improving the accuracy of nitrogen estimates from nonpoint source in a river catchment with multi-isotope tracers
- Title
- Improving the accuracy of nitrogen estimates from nonpoint source in a river catchment with multi-isotope tracers
- Authors
- Jung; Hyejung; Lee; Jeonghoon; Yoo; Jisu; Kim; Minhee; Yun S.
- Ewha Authors
- 이정훈
- SCOPUS Author ID
- 이정훈
- Issue Date
- 2024
- Journal Title
- Science of the Total Environment
- ISSN
- 0048-9697
- Citation
- Science of the Total Environment vol. 921
- Keywords
- Climate change; Complex land use; Legacy effect; Multiple isotope tracers; Nitrogen dynamics; Nonpoint source
- Publisher
- Elsevier B.V.
- Indexed
- SCIE; SCOPUS
- Document Type
- Article
- Abstract
- Climate change can affect precipitation patterns, temperature, and the hydrological cycle, consequently influencing the dynamics of nitrogen (N) within aquatic ecosystems. In this study, multiple stable isotopes (15N-NO3/18O-NO3 and 2H-H2O/18O-H2O) were used to investigate the N sources and flowpath within the Bogang stream in South Korea. Within the vicinity of the stream with complex land use where various N sources were present, four end-members (rainfall, soil, sewage, and livestock) were sampled and examined. Consequently, spatial-temporal variations of the N sources were observed dependent on the type of land use. During the dry season, sewage accounted for the dominant N source, ranging from 62.2 % to 80.2 %. In contrast, nonpoint sources increased significantly across most sites during the wet season (10.3–41.6 % for soil; 6.3–35.2 % for livestock) compared to the dry season (7.7–28.5 % for soil; 6–13.2 % for livestock). However, sewage (78.7 %) remains dominant, representing the largest ratio at the site downstream of the wastewater treatment plant during the wet season. This ratio showed a notable difference from the calculated N loading ratio of 52.2 %, especially for livestock. This suggests that a significant potential for N legacy effects, given that groundwater flow is likely to be the primary hydrological pathway delivering N to rivers. This study will help to develop water resource management strategies by understanding how the interaction between N sources and hydrological process responds to climate change within sub-basins. © 2024 Elsevier B.V.
- DOI
- 10.1016/j.scitotenv.2024.171016
- Appears in Collections:
- 사범대학 > 과학교육과 > Journal papers
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