Identifying the critical watershed regions creating lake nutrient enrichment (SLRs) based on a watershed-lake integrated perspective – A case study of Chaohu Lake Basin, China
Identifying critical watershed source regions is essential for lake environments protection. However, related studies are mainly focused on assessing watershed Total Nitrogen (TN) and Total Phosphorus (TP) loads, while the impact of watershed on lake nutrients is rarely considered. To fill this gap,...
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| Format: | Article |
| Language: | English |
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Elsevier
2021-02-01
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| Series: | Ecological Indicators |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1470160X20309766 |
| _version_ | 1818937349688524800 |
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| author | Chen Lin Junfeng Xiong Ronghua Ma Chenxi Zhu |
| author_facet | Chen Lin Junfeng Xiong Ronghua Ma Chenxi Zhu |
| author_sort | Chen Lin |
| collection | DOAJ |
| description | Identifying critical watershed source regions is essential for lake environments protection. However, related studies are mainly focused on assessing watershed Total Nitrogen (TN) and Total Phosphorus (TP) loads, while the impact of watershed on lake nutrients is rarely considered. To fill this gap, the amounts of watershed nutrient loss over the last ten years were assessed, and the corresponding lake TN and TP concentrations were acquired. Finally, the critical watershed regions creating lake nutrient enrichment (SLRs) were identified by analyzing the relationships from the integrated watershed-lake perspective. The results indicated that: i) The watershed TN and TP output amounts showed a rising trend in the last 10 years (mostly between 2012 and 2016); ii) The lake TP and TN in the western lake were much higher than those in the eastern lake; and iii) SLRs were located in the western Chaohu watershed. Specific findings were obtained from the statistical analysis in sub-watershed and intra-annual scales. First, the SLRs for TN were concentrated in the Nanfei (NF), which covered only 32 sub-watersheds and were mainly located in urban construction areas. In contrast, the SLRs for TP were more widely distributed and located contiguously across the major influent streams belonging to the Hangbu (HB) and NF. Second, the intra-annual variance is obvious. For TP, the spring season can be considered the most ideal period for SLRs identification, while the summer season is ideal for TN. These differences are driven by different loss processes, discharge capacities, and occurrence forms for TN and TP. In general, the integrated perspective of lake-watershed is helpful for identifying SLRs, and the temporal analysis at the seasonal scale and spatial analysis at the sub-watershed scale facilitate a deeper understanding of SLRs. |
| first_indexed | 2024-12-20T05:50:33Z |
| format | Article |
| id | doaj.art-25907ad31b20460ebe0dcafbf6011a73 |
| institution | Directory Open Access Journal |
| issn | 1470-160X |
| language | English |
| last_indexed | 2024-12-20T05:50:33Z |
| publishDate | 2021-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Ecological Indicators |
| spelling | doaj.art-25907ad31b20460ebe0dcafbf6011a732022-12-21T19:51:11ZengElsevierEcological Indicators1470-160X2021-02-01121107037Identifying the critical watershed regions creating lake nutrient enrichment (SLRs) based on a watershed-lake integrated perspective – A case study of Chaohu Lake Basin, ChinaChen Lin0Junfeng Xiong1Ronghua Ma2Chenxi Zhu3Key Laboratory of Watershed Geographic Sciences, Institute of Geography and Limnology, Chinese Academy Sciences, Chinese Academy of Sciences, Nanjing 210008, China; Corresponding author.Key Laboratory of Watershed Geographic Sciences, Institute of Geography and Limnology, Chinese Academy Sciences, Chinese Academy of Sciences, Nanjing 210008, ChinaKey Laboratory of Watershed Geographic Sciences, Institute of Geography and Limnology, Chinese Academy Sciences, Chinese Academy of Sciences, Nanjing 210008, ChinaJiangsu Institute of Land Surveying and Planning, Nanjing 210017, ChinaIdentifying critical watershed source regions is essential for lake environments protection. However, related studies are mainly focused on assessing watershed Total Nitrogen (TN) and Total Phosphorus (TP) loads, while the impact of watershed on lake nutrients is rarely considered. To fill this gap, the amounts of watershed nutrient loss over the last ten years were assessed, and the corresponding lake TN and TP concentrations were acquired. Finally, the critical watershed regions creating lake nutrient enrichment (SLRs) were identified by analyzing the relationships from the integrated watershed-lake perspective. The results indicated that: i) The watershed TN and TP output amounts showed a rising trend in the last 10 years (mostly between 2012 and 2016); ii) The lake TP and TN in the western lake were much higher than those in the eastern lake; and iii) SLRs were located in the western Chaohu watershed. Specific findings were obtained from the statistical analysis in sub-watershed and intra-annual scales. First, the SLRs for TN were concentrated in the Nanfei (NF), which covered only 32 sub-watersheds and were mainly located in urban construction areas. In contrast, the SLRs for TP were more widely distributed and located contiguously across the major influent streams belonging to the Hangbu (HB) and NF. Second, the intra-annual variance is obvious. For TP, the spring season can be considered the most ideal period for SLRs identification, while the summer season is ideal for TN. These differences are driven by different loss processes, discharge capacities, and occurrence forms for TN and TP. In general, the integrated perspective of lake-watershed is helpful for identifying SLRs, and the temporal analysis at the seasonal scale and spatial analysis at the sub-watershed scale facilitate a deeper understanding of SLRs.http://www.sciencedirect.com/science/article/pii/S1470160X20309766Critical watershed regionWatershed non-point source pollutionNutrientsChaohu Lake BasinSpatial and temporal features |
| spellingShingle | Chen Lin Junfeng Xiong Ronghua Ma Chenxi Zhu Identifying the critical watershed regions creating lake nutrient enrichment (SLRs) based on a watershed-lake integrated perspective – A case study of Chaohu Lake Basin, China Ecological Indicators Critical watershed region Watershed non-point source pollution Nutrients Chaohu Lake Basin Spatial and temporal features |
| title | Identifying the critical watershed regions creating lake nutrient enrichment (SLRs) based on a watershed-lake integrated perspective – A case study of Chaohu Lake Basin, China |
| title_full | Identifying the critical watershed regions creating lake nutrient enrichment (SLRs) based on a watershed-lake integrated perspective – A case study of Chaohu Lake Basin, China |
| title_fullStr | Identifying the critical watershed regions creating lake nutrient enrichment (SLRs) based on a watershed-lake integrated perspective – A case study of Chaohu Lake Basin, China |
| title_full_unstemmed | Identifying the critical watershed regions creating lake nutrient enrichment (SLRs) based on a watershed-lake integrated perspective – A case study of Chaohu Lake Basin, China |
| title_short | Identifying the critical watershed regions creating lake nutrient enrichment (SLRs) based on a watershed-lake integrated perspective – A case study of Chaohu Lake Basin, China |
| title_sort | identifying the critical watershed regions creating lake nutrient enrichment slrs based on a watershed lake integrated perspective a case study of chaohu lake basin china |
| topic | Critical watershed region Watershed non-point source pollution Nutrients Chaohu Lake Basin Spatial and temporal features |
| url | http://www.sciencedirect.com/science/article/pii/S1470160X20309766 |
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