Simulation of Wheat and Soybean Phreatic Evaporation on Rainy and Non-Rainy Days in Huaibei Plain
In order to reveal the law of phreatic evaporation at different growth stages of rainy and non-rainy crops in Huaibei Plain,this paper used the experimental data of Wudaogou Hydrological Experimental Station from 1998 to 2020,and used the nonlin-ear fitting method to simulate the variation of phreatic evaporation at different growth stages of winter wheat and summer soybean in sandy ginger black soil with buried depth,and proposed a fitting model for phreatic evaporation calculation on rainy and non-rainy days.The critical burial depth of crops in rainy and non-rainy days was obtained.The results showed that the phreatic evaporation during the initial growth period and maturity period of winter wheat in rainy weather decreased with the increase of buried depth,which showed an exponential function relationship.The phreatic evaporation in rapid growth stage and middle growth stage increases first and then decreases with the increase of burial depth,showing a complex function relationship.In non-rainy days,the phreatic evaporation decreases with the increase of buried depth,showing an exponential function relationship,and the critical buried depth is 2.34～3.91 m.The phreatic evaporation of summer soybean in rainy and non-rainy growth periods decreased with the increase of buried depth,presenting an exponential function or power function relationship.The critical buried depth was 2.10～3.80 m,and the fitting model R2 was 0.83～0.98.The RMSE ranges from 0.051 9 mm/d to 0.262 4 mm/d,which can accurately pre-dict the diphreatic evaporation of crops at different stages of rainy and non-rainy growth periods.
rainy and non-rainy daysphreatic evaporationcritical burial depthwudaogou hydrological experimental station
万方数据
维普
