Risk assessment of non-point source pollution in tropical watersheds considering water functional zones
A comprehensive assessment of the spatiotemporal characteristics of non-point source (NPS) pollution risk in watersheds is essential for effective water pollution management. However, few studies comprehensively assess the risk of land-based and water-based NPS pollutant loads in tropical watersheds...
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Elsevier
2025-02-01
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| Series: | Ecological Indicators |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1470160X25000573 |
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| author | Shiyu Xue Yanhu He Hao Cai Jun Li Lirong Zhu Changqing Ye |
| author_facet | Shiyu Xue Yanhu He Hao Cai Jun Li Lirong Zhu Changqing Ye |
| author_sort | Shiyu Xue |
| collection | DOAJ |
| description | A comprehensive assessment of the spatiotemporal characteristics of non-point source (NPS) pollution risk in watersheds is essential for effective water pollution management. However, few studies comprehensively assess the risk of land-based and water-based NPS pollutant loads in tropical watersheds characterized by distinct wet and dry seasons. Therefore, this study employs the Soil and Water Assessment Tool (SWAT) model and integrates the concept of water function zones (WFZ) to comprehensively assess the spatiotemporal characteristics, source apportionment, and wet and dry season-specific risk of NPS pollution in the Wanquan River Basin (WRB), considering both the land surface loading risk and the input risk from adjacent water bodies. The research findings indicate that the risk of NPS pollution demonstrates significant seasonal and spatial variability. In terms of spatial distribution, the high-load areas of total nitrogen (TN) and total phosphorus (TP) from NPS are primarily concentrated in downstream regions characterized by extensive agricultural land and orchards. In terms of temporal distribution, the risk of NPS pollution from ammonia nitrogen (NH3-N), TN, and TP increased by 26.68%, 58.70%, and 21.05%, respectively, during the wet season (May − October) compared to the dry season (November − April). Furthermore, there is no significant positive correlation between the risk of NPS pollution and the corresponding land-based NPS pollution load. The risk of NPS pollution is significantly influenced by pollutant inputs from adjacent water bodies. Regions characterized by high land-based NPS pollutant loads do not necessarily correspond to high NPS risk, and conversely, regions with high NPS risk do not necessarily exhibit high land-based NPS pollutant loads. The research findings provide a valuable reference for the precise risk assessment and effective management of NPS pollution in watersheds. |
| format | Article |
| id | doaj-art-dd29f7f6299146a689c40efa6c3294c4 |
| institution | Kabale University |
| issn | 1470-160X |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Ecological Indicators |
| spelling | doaj-art-dd29f7f6299146a689c40efa6c3294c42025-01-27T04:21:45ZengElsevierEcological Indicators1470-160X2025-02-01171113128Risk assessment of non-point source pollution in tropical watersheds considering water functional zonesShiyu Xue0Yanhu He1Hao Cai2Jun Li3Lirong Zhu4Changqing Ye5School of Ecology, Hainan University, Haikou 570228, ChinaInstitute of Environmental and Ecological Engineering, Guangdong University of Technology, Guangzhou 510006, ChinaSchool of Ecology, Hainan University, Haikou 570228, ChinaSchool of Ecology, Hainan University, Haikou 570228, ChinaSchool of Tourism, Hainan University, Haikou 570228, ChinaSchool of Ecology, Hainan University, Haikou 570228, China; Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province, Haikou 570228, China; Corresponding author at: School of Ecology, Hainan University, Haikou 570228, China.A comprehensive assessment of the spatiotemporal characteristics of non-point source (NPS) pollution risk in watersheds is essential for effective water pollution management. However, few studies comprehensively assess the risk of land-based and water-based NPS pollutant loads in tropical watersheds characterized by distinct wet and dry seasons. Therefore, this study employs the Soil and Water Assessment Tool (SWAT) model and integrates the concept of water function zones (WFZ) to comprehensively assess the spatiotemporal characteristics, source apportionment, and wet and dry season-specific risk of NPS pollution in the Wanquan River Basin (WRB), considering both the land surface loading risk and the input risk from adjacent water bodies. The research findings indicate that the risk of NPS pollution demonstrates significant seasonal and spatial variability. In terms of spatial distribution, the high-load areas of total nitrogen (TN) and total phosphorus (TP) from NPS are primarily concentrated in downstream regions characterized by extensive agricultural land and orchards. In terms of temporal distribution, the risk of NPS pollution from ammonia nitrogen (NH3-N), TN, and TP increased by 26.68%, 58.70%, and 21.05%, respectively, during the wet season (May − October) compared to the dry season (November − April). Furthermore, there is no significant positive correlation between the risk of NPS pollution and the corresponding land-based NPS pollution load. The risk of NPS pollution is significantly influenced by pollutant inputs from adjacent water bodies. Regions characterized by high land-based NPS pollutant loads do not necessarily correspond to high NPS risk, and conversely, regions with high NPS risk do not necessarily exhibit high land-based NPS pollutant loads. The research findings provide a valuable reference for the precise risk assessment and effective management of NPS pollution in watersheds.http://www.sciencedirect.com/science/article/pii/S1470160X25000573Pollution risk assessmentSWAT modelNon-point source pollutionWater functional zoneHainan Island |
| spellingShingle | Shiyu Xue Yanhu He Hao Cai Jun Li Lirong Zhu Changqing Ye Risk assessment of non-point source pollution in tropical watersheds considering water functional zones Ecological Indicators Pollution risk assessment SWAT model Non-point source pollution Water functional zone Hainan Island |
| title | Risk assessment of non-point source pollution in tropical watersheds considering water functional zones |
| title_full | Risk assessment of non-point source pollution in tropical watersheds considering water functional zones |
| title_fullStr | Risk assessment of non-point source pollution in tropical watersheds considering water functional zones |
| title_full_unstemmed | Risk assessment of non-point source pollution in tropical watersheds considering water functional zones |
| title_short | Risk assessment of non-point source pollution in tropical watersheds considering water functional zones |
| title_sort | risk assessment of non point source pollution in tropical watersheds considering water functional zones |
| topic | Pollution risk assessment SWAT model Non-point source pollution Water functional zone Hainan Island |
| url | http://www.sciencedirect.com/science/article/pii/S1470160X25000573 |
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