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Mechanism of water savings and pollution reduction in paddy fields of three typical areas in southern China

International Journal of Agricultural and Biological Engineering 2022年第1期15卷 199-207页

作者： Menghua Xiao Yuanyuan Li Yi Jia Jianwen Wang Zhejiang Institute of Hydraulics and Estuary(Zhejiang Institute of Marine Planning and Design) Hangzhou 310020China North China University of Water Resource and Electric Power Zhengzhou 450045China Zhejiang Rural Water Conservancy Management Center Hangzhou 310009China Qiantang River irrigation Area Management Center Xiaoshan DistrictHangzhou CityHangzhou 311200China

Field irrigation and drainage regulation and fertilization application could affect water utilization and pollution transportation in a paddy *** this study,representative rice-producing areas of Zhejiang Province in southern China were selected to study the effects of different field water level control(conventional irrigation and drainage W0,controlled irrigation and drainage W1 and W2)and different fertilization methods(2 times of fertilization F2 and three times of fertilization F3)on water irrigation quantity and consumption of rice,rice growth,water utilization,and pollution *** showed that field water level control had a great effect on irrigation quota in growing period rather than that in soaking period,and irrigation quota for W0 was 37.0%-71.7%higher than that for W1 and W2 in the whole growth period of *** the upper limit of rain storage was greatly increased by W1 and W2,on the contrary,the yield under W1 and W2 was 0.4%-2.1%higher than that under *** consumption,water leakage,and evapotranspiration were 16.63%-34.4%,39.97%-60.8%,and 9.40%-31.53%lower under W1 and W2 than those under W0,respectively,while it showed no significant changes under W1 and *** use rate and WUEI(water use efficiency of irrigation)under W1 and W2 had been significantly improved by 8.20%-129.58%and 31.58%-201.61%compared to *** contribution of nitrogen and phosphorus loss from surface water accounted for 90%and the total pollution load of total nitrogen(TN),NO_(3)^(-)-N,NH_(4)^(+)-N and chemical oxygen demand(COD)were 20.0%-63.4%,21.8%-66.3%,21.5%-63.8%,and 21.4%-46.5%lower for W1 and W2 than that for W0,***,compared to F2,dispersed fertilization(F3)was beneficial to increase the yield and decrease pollutant ***,the path of IRA→NH_(4)^(+)-N→COD and IRA→WCA→WUE_(I) presented partial remediation effect,and the effect size was 23.6%and 38.1%,respectively,the path of IRA→WUE_(I)→WUE_(ET) presented a full r

关键词： controlled irrigation and drainage water consumption water use efficiency non-point source pollution structural equation mode

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Optimizing water-saving irrigation schemes for rice(Oryza sativa L.)using DSSAT-CERES-Rice model

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International Journal of Agricultural and Biological Engineering 2023年第2期16卷 142-151页

作者： Shikai Gao Qiongqiong Gu Xuewen Gong Yanbin Li Shaofeng Yan Yuanyuan Li School of Water Conservancy North China University of Water Resources and Electric PowerZhengzhou 450046China China irrigation and drainage Development Center Beijing 100000China Hubei Institute of Water Resources Survey and Design Wuhan 430070China

Rice is one of the major crops in China,and enhancing the rice yield and water use efficiency is critical to ensuring food security in *** how to optimize a scientific and efficient irrigation and drainage scheme by combining existing technology is currently a hot *** growth models can be used to assess actual or proposed water management regimes intended to increase water use efficiency and mitigate water *** this study,a CERES-Rice model was calibrated and validated using a two-year field *** irrigation and drainage treatments were designed for the experiment:alternate wetting and drying(AWD),controlled drainage(CD),controlled irrigation and drainage for a low water level(CID1),and controlled irrigation and drainage for a high water level(CID2).According to the indicators normalized root mean square error(NRMSE)and index of agreement(d),the calibrated CERES-Rice model accurately predicted grain yield(NRMSE=6.67%,d=0.77),,shoot biomass(NRMSE=3.37%,d=0.77),actual evapotranspiration(ETa)(NRMSE=3.83%,d=0.74),irrigation volume(NRMSE=15.56%,d=0.94),and leaf area index(NRMSE=9.69%,d=0.98)over 2 *** calibrated model was subsequently used to evaluate rice production in response to the four treatments(AWD,CD,CID1,and CID2)under 60 meteorological scenarios which were divided into wet years(22 a),normal years(16 a),and dry years(22 a).Results showed that the yield of AWD was the largest among four treatments in different hydrological *** to that of AWD,the yield of CD,CID1,and CID2 were respectively reduced by 5.7%,2.6%,8.7%in wet years,9.2%,2.3%,8.6% in normal years,and 9.2%,3.8%,3.9% in dry ***,rainwater use efficiency and irrigation water use efficiency were the greatest for CID2 in different hydrological *** entropy-weighting TOPSIS model was used to optimize the four water-saving irrigation schemes in terms of water-saving,labor-saving and high-yield,based on the simulation results of the CERES-Rice m

关键词： CERES-Rice controlled irrigation and drainage water-saving long-term weather data water use efficiency

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