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| Estimation of evapotranspiration of winter wheat under deficient irrigation based on SIMDualKc model |
| ZHENG Zhen1, WANG Zikai2, CAI Huanjie3,4* |
| 1. National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. Zhenjiang Engineering Survey & Design Institute Co. Ltd, Zhenjiang, Jiangsu 212013, China; 3. Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China |
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Abstract In order to estimate the evapotranspiration(ET), crop transpiration of winter wheat and soil evaporation in semiarid areas in Northwest China, a 2-year controlled irrigation experiment was conducted in the winter wheat field to calibrate and evaluate the SIMDualKc model for ET estimation in semiarid regions. Evapotranspiration was observed by a large-scale weighing lysimeter or calculated by water balance approach, the observed evapotranspiration with the simulated ones was compared. The results showed that the SIMDualKc model could accurately simulate the evapotranspiration of winter wheat under different irrigation treatments in Northwest China. The average absolute error was 0.6433mm/d. The simulated value of basal crop coefficient for winter wheat at the initial-, mid-, and late-season growth stages was 0.35, 1.3 and 0.2, respectively. In addition, the model could simulate the soil water stress, soil evaporation and crop transpiration accurately. During the whole winter wheat growing season, the soil evaporation mainly occurred in the early growth stage, decreased in midseason and slightly increased in late season.
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Received: 02 July 2019
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