Applicability of improved CERES-Maize model under mulch drip irrigation of maize
FU Chunxiao1,2, GONG Shihong1*, WANG Jiandong1, ZHANG Yanqun1
1.Department of Irrigation and Drainage, China Institute of Water Resources and Hydropower Research, Beijing 100048, China; 2.School Water Conservancy and Hydroelectric Power, Hebei Univercity of Engineering, Handan, Hebei 056002, China
An improved CERES-Maize model was generated to simulate the growth and yield of maize under mulch drip irrigation. Based on theory of effective accumulation temperature and compensating action on effective cumulative ambient temperature by soil temperature increase in mulched maize fields, the input data of ambient temperature for the modelled meteorological module were improved by quantifying the compensation value on the ambient temperature. The canopy energy extinction coefficient, K, which can affect evapotranspiration and water balance, was adjusted to 0.5. The improved model was validated with two-year experimental data of maize under mulch drip irrigation in 2014—2015. The results show that the compensatory coefficient of cumulative soil temperature, Cc, in plastic film mulch field is 0.45 from sowing to emergence stages, and 0.2 from emergence to tassel stages. The absolute relative errors(ARE)of above-ground biomass and grain yield decrease and approach zero with decreasing K. The improved model can simulate flowing days, mature days, biomass and maize yield under mulch drip irrigation quite well with AREs of 0.58%,0.37%,7.65% and 16.95%, respectively, and the corresponding relative root mean square errors(RRMSE)are 0.84%,0.51%,8.75% and 17.50%, respectively.
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