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| Modeling N loss from paddy fields and sensitivity analysis with DNDC Model |
| Received:June 14, 2016 |
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| KeyWord:paddy fields;N loss;DNDC model;sensitivity analysis;runoff;leaching |
| Author Name | Affiliation | E-mail | | ZHAO Zheng | School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China
Eco-environmental Protection Institute of Shanghai Academy of Agricultural Science, Shanghai 201403, China | | | WU Shu-hang | Eco-environmental Protection Institute of Shanghai Academy of Agricultural Science, Shanghai 201403, China | | | ZHOU De-ping | Eco-environmental Protection Institute of Shanghai Academy of Agricultural Science, Shanghai 201403, China | | | CHU Chang-bin | Eco-environmental Protection Institute of Shanghai Academy of Agricultural Science, Shanghai 201403, China | | | CAO Lin-kui | School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China | clk@sjtu.edu.cn |
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| Abstract: |
| N loss from paddy fields lead to agricultural non-point source pollution. Observed data from lysimeter study was used for validation of DNDC model, and then sensitivity analysis was conducted with DNDC model to evaluate the impact factors that affect N loss from paddy fields. The results indicated that DNDC model accurately simulated rice yields and N loss from paddy fields under different fertilization methods. Fertilization and precipitation are the major factors that affect N loss from paddy field, and showed positive correlation with N loss. N loss through subsurface leaching negatively correlated with SOC content and soil clay fraction, while positively correlated with soil nitrate content. According to sensitivity analysis, decreasing of fertilization rate, application of water-saving irrigation and organic manure could effectively reduce N loss from paddy fields. |
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