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 are found that the Jackson model construc-ted based on Tc-Ta at 14:00 shows 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 has a slightly higher cor-relation(R2 is 0.967)with the measured values and the deviation is smaller(RMSE is 0.735 mm/d).The results can provide a basis for simulating evapotranspiration of greenhouse crops and scientific de-cision-making of water-saving irrigation.
关键词
冠气温差/冠层温度/温室黄瓜/蒸散量/Jackson模型
Key words
canopy-air temperature difference/canopy temperature/greenhouse cucumber/evapotranspiration/Jackson model
维普
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