| Cite this article: | 彭记永,李树岩,方文松.0 引言1 材料和方法[J].灌溉排水学报,0,():-. |
| PENG Jiyong,LI Shuyan,FANG Wensong.0 引言1 材料和方法[J].灌溉排水学报,0,():-. |
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| Effect of lodging on Evapotranspiration at milk ripening stage of Summer Maize |
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PENG Jiyong1,2, LI Shuyan1,2, FANG Wensong1,2
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1.CMA·2.Henan Agrometeorological Support and Applied Technique Key Laboratory
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| Abstract: |
| In order to determine the variation characteristics of farmland evapotranspiration after summer maize lodging. In view of a strong wind lodging process of summer maize at Zhengzhou agrometeorological station on August 25, 2016. Based on the meteorological data, crop observation data and vorticity observation data in normal years (2017), the variation characteristics of evapotranspiration in normal growth years of summer maize were simulated and tested by Penman-Monteith model (P-M model), the parameter model is optimized, and the optimal fit between the simulated value of P-M model and the measured value were calculated. Then, according to the P-M model with calibration parameters, using the field survey data and assuming that summer maize not lodging, the farmland evapotranspiration was simulated, and the simulation results were used as the control value of evapotranspiration (P-MN); Based on the actual lodging plant parameters, the farmland evapotranspiration was simulated, and the simulation result was the actual lodging evapotranspiration (P-ML). The results showed that the simulated value of normal annual evapotranspiration was in good agreement with the measured value. The simulated absolute error was 0.005, the relative error was 10.7%, and the root mean square error and consistency index were 0.019 and 0.98 respectively, indicating that the model had good predictability. In the lodging year, the absolute and relative errors between the simulated and measured evapotranspiration after lodging were 0.002mm·30min-1 and 2.9%, respectively; the root mean square error was 0.001 and the consistency index was 0.98. According to the calculation results of P-M model, after summer maize lodging, farmland evapotranspiration decreased by 0.019mm·30min-1, daily average decreased by 0.68mm·D-1, 18.3%. In the early stage of lodging, the daily average decreased by 0.99 mm·D-1, 20.6%; In the later stage of lodging, the daily average decreased by 0.42 mm·D-1, 14.8%. |
| Key words: Summer maize Lodging; Penman-Monteith Model; Eddy covariance; Simulated；Evapotranspiration |
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