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| Simulation of non-point source pollution in Weizigou watershed with AnnAGNPS model |
| Received:December 06, 2016 |
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| KeyWord:AnnAGNPS;non-point source pollution;Weizigou watershed;total nitrogen;total phosphorus;uncertainty |
| Author Name | Affiliation | E-mail | | TU Hong-zhi | State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China | | | HOU Ying | State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China | | | CHEN Wei-ping | State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China | wpchen@rcees.ac.cn |
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| Abstract: |
| In this study,the AnnAGNPS (Annualized Agricultural Non-Point Source) model was used to simulate NPS loads from the Weizigou watershed from 2009 to 2015.Water quality monitoring data were used to evaluate the performance and suitability of AnnAGNPS.The results showed that the predictions of the runoff and total nitrogen (TN) load for the Weizigou watershed by AnnAGNPS were reasonable,while the prediction of total phosphorus (TP) showed relatively large uncertainties.The model generally underestimated runoff caused by low rainfalls,while overestimated runoff resulting from heavy rainfalls.The changes of TN and TP loads over months had similar trends with the change of rainfall.More than 80% of the annual NPS load occurred in rainy-season from May to August.Annual average TN and TP load from the Weizigou watershed from 2009 to 2015 were 22 295.28 kg and 7 085.00 kg,respectively,and they had the similar changing trend over years.The Spearman correlation coefficients were 0.93 and 0.92 for the correlations between TN and rainfall and between TP and rainfall,respectively (P<0.01).The modeling results on the annual scale showed that the change of total pollutant load was strongly influenced by the change of rainfall in the Weizigou watershed.TN and TP loadings had similar spatial distribution characteristics in the study area.The loadings of TN and TP were generally higher in the downstream areas than in the north-western areas of the Weizigou watershed. |
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