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Modeling the impacts of alternative fertilization methods on nitrogen loading in rice production in Shanghai

文献类型： 外文期刊

作者： Zhao, Zheng 1 ; Sha, Zhimin 1 ; Liu, Yibo 3 ; Wu, Shuhang 2 ; Zhang, Hanlin 2 ; Li, Changsheng 4 ; Zhao, Qi 1 ; Cao, Link 1 ;

作者机构： 1.Shanghai Jiao Tong Univ, Sch Agr & Biol, 800 Dongchuan Rd, Shanghai 200240, Peoples R China

2.Shanghai Acad Agr Sci, Ecoenvironm Protect Inst, Shanghai 201403, Peoples R China

3.Nanjing Univ Informat Sci & Technol, Sch Appl Meteorol, Jiangsu Key Lab Agr Meteorol, Nanjing 210044, Jiangsu, Peoples R China

4.Univ New Hampshire, Inst Study Earth Ocean & Space, Durham, NH 03824 USA

关键词： Nitrogen loading;Paddy field;DNDC model;Best management practice;Organic manure

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：7.963； 五年影响因子：7.842 ）

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收录情况： SCI

摘要： Nitrogen (N) loss from paddy fields is an important source of agricultural non-point source pollution that leads to eutrophication of water bodies and degradation of water quality. The impacts of alternative N fertilizer management practices on N loading (N loss through runoff and leaching) from paddy fields in Shanghai were assessed using a process-based biogeochemical model, DNDC. The results indicated that the current fertilization rate in paddy fields of Shanghai (300 kg N/ha) exceeds the actual rice demand and has led to substantial N loading of 1142 +/- 276 kg. The combined application of urea at 150 kg N/ha and organic manure at 100 kg N/ha was identified as the best fertilization method for rice cultivation in Shanghai; this application maintained optimal rice yields and significantly reduced N loading to 714 +/- 151 kg in comparison with the current fertilization rate. A sensitivity test was conducted with various input parameters, and the results indicated that fertilization, precipitation and soil properties were the most sensitive factors that regulate N loss from paddy fields. The variability of soil properties, especially SOC led to high uncertainties in the simulated results. Therefore, the local climate conditions and soil properties should be taken into account in the identification of the best management practice (BMP) for rice cultivation, given the high spatially heterogeneous N loading values across all towns used in the simulation. The DNDC model is an effective approach for simulating and predicting N loading in paddy fields under alternative agricultural management practices. (C) 2016 Elsevier B.V. All rights reserved.

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