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Simulation of greenhouse cucumber evapotranspiration based on canopy-air temperature difference |
JIANG Jianhui1, YAN Haofang1,2*, ZHANG Chuan3, WANG Guoqing2,ZHANG Jianyun2, LIANG Shaowei1, DENG Shuaishuai1 |
1. National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. The National Key Laboratory of Water Disaster Prevention, Nanjing Hydraulic Research Institute, Nanjing, Jiangsu 210029, China; 3. School of Agricultural Enginee-ring, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract The estimation models of daily evapotranspiration(ETc)of cucumber in greenhouse were established based on canopy-air temperature difference(Tc-Ta)at different times, and the accuracy of estimating of Tc-Ta at different times on ETc was analyzed. The Jackson model based on Tc-Ta was constructed according to the different growth stages of cucumber, and the estimated results of the model were compared with the Penman-Monteith model based on canopy resistance parameter(rc)and the measured data of evapotranspiration meter. The conclusions were as follows: the Jackson model constructed based on Tc-Ta at 14:00 showed the highest accuracy(R2 is 0.937)and the lowest error(RMSE is 0.722 mm/d)in estimating greenhouse cucumber ETc. Compared with the Penman-Monteith model(R2 is 0.964), the ETc estimation of Jackson empirical model based on Tc-Ta had a slightly higher correlation(R2 is 0.967)with the measured values and the deviation was smaller(RMSE is 0.735 mm/d). The results can provide a basis for simulating evapotranspiration of greenhouse crops and scientific decision-making of water-saving irrigation.
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Received: 23 April 2023
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