Research on the field evapotranspiration and crop coefficient based on eddy correlation
To investigate the effects of crop evapotranspiration and crop coefficient on crop water re-source utilization efficiency and yield,EC3000 eddy covariance system is adopted to analyze farm-land evapotranspiration(ET),crop coefficient(Kc),net radiation(Rn),soil heat flux(G),sensible heat flux(H)and latent heat flux(LE).The effects of crop evapotranspiration and crop coefficient on farmland is analyzed as well.The results are as follous:(1)During the growth period from 2021 to 2022,the crop evapotranspiration ETc is 582.95 and 609.63 mm respectively.The crop coefficient(Kc)fluctuates between 0.39 and 1.43 at different growth stages.(2)The mean values of Rn,G,H and LE are 135.92,5.81,15.27 and 81.89 W/m2 respectively.LE/Rn is 64％.Energy closure rate(EBR)is 0.78.The results provide theoretical basis for crop production in the Qaidam area.
field evapotranspirationeddy correlationcrop coefficientenergy balance
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万方数据
