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| Simulation of Non-point Source Pollution in Dagu Watershed，Jiaodong Peninsula Based on AnnAGNPS Model |
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| KeyWord:AnnAGNPS model; non-point source pollution; scenario analysis; Dagu watershed |
| Author Name | Affiliation | | WANG Xiao-li | Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research（YIC）, Chinese Academy of Sciences（CAS）, Yantai 264003, China
University of Chinese Academy of Sciences, Beijing 100049, China | | JIANG De-juan | Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research（YIC）, Chinese Academy of Sciences（CAS）, Yantai 264003, China | | ZHANG Hua | Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research（YIC）, Chinese Academy of Sciences（CAS）, Yantai 264003, China |
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| Abstract: |
| Non-point source pollution is characteristized with wide scale, great casualness, and poor predictability. In this study, the AnnAGNPS（Annualized Agricultural Non-Point Source） model was calibrated and validated in Dagu watershed of Jiaodong Peninsula with observed runoff and dissolved nitrogen data. The spatio-temperal distribution of dissolved nitrogen load was then estimated using the calibrated model. Annual average runoff and dissolved nitrogen load from Dagu watershed into Jiaozhou bay were 3.58×108 m3 and 4.27×103 t, respectively, occurring mainly during flood-season from June to September. Both were influenced by meterological factors such as seasonal precipitation distribution, intensive human activities such as reservoir and dam operation, farmland irrigation and sewage waste discharge. Spatially, the dissolved nitrogen load was greater in southern than in northern part, which was due to agricultural activities and industrial and domestic sewage discharges. Fertilization contributed mainly to dissolved nitrogen load in Dagu watershed, followed by sewage waste discharge from residential areas. Based on scenario simulation, reducing chemical fertilizers and practicing conservation tillage could decrease nutrient load from Dagu watershed without lowering crop production. |
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