| Analysis on the sensitivity to water stress of winter wheat based on a dynamicsimulation model |
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| DOI：10.7606/j.issn.1000-7601.2016.01.33 |
| Key Words: winter wheat CERES-Wheat model water stress sensitivity coefficient |
| Author Name | Affiliation | | HE Peng | College of Information and Electrical Engineering, China Agricultural University, Beijing 100083, China | | WANG Peng-xin | College of Information and Electrical Engineering, China Agricultural University, Beijing 100083, China | | XIE Yi | College of Information and Electrical Engineering, China Agricultural University, Beijing 100083, China | | ZHANG Shu-yu | Shaanxi Meteorological Bureau, Xi'an, Shaanxi 710014, China | | LIU Jun-ming | College of Information and Electrical Engineering, China Agricultural University, Beijing 100083, China |
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| Abstract: |
| Using the calibrated CERES-Wheat model under the DSSAT shell, daily actual evapotranspiration and potential evapotranspiration during the growth stages of winter wheat were simulated in the Guangzhong plain of Shaanxi Province, China. Sensitivity coefficients of water stress of winter wheat at different growth stages were calculated by the Jensen model. The results indicated that the sensitivity coefficients of water stress on winter wheat were the same at the same growth stage in both irrigated and rainfed areas. The sensitivity coefficients of winter wheat were the largest at the jointing stage, and were gradually decreased at the heading-filling stage, turning green stage and dough stage. The sensitivity coefficients at the jointing stage and heading-filling stage were 0.589 and 0.342 in the irrigated areas, respectively, indicating that the water stress at these two stages had different impacts on wheat yield. Nevertheless, those were 0.405 and 0.383 in the rainfed areas, suggesting that the water stress at these two stages had similar impacts on wheat yield. Because the irrigated areas were often irrigated at the jointing stage in order to relieve the lack of water, the sensitivity of water stress on winter wheat was weakened, and the difference in the sensitivity coefficients of winter wheat between the jointing stage and the heading-filling stage was small. Based on the sensitivity coefficients of water stress, specific measurements should be taken on winter wheat according to the water-deficit conditions at each growth stage to ensure rational use of drought-related resources. |
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