Study on Drought of Spring Maize Based on Scintillation Flux and Soil Moisture
To identify drought conditions at different fertility stages within the growing season of spring maize in Huailai County,Hebei Province,this study calculated a revised crop water deficit index(RCWDI)by using the actual evapotranspiration instead of potential evapotranspiration for spring maize in 2021 in Huailai County,Hebei Province based on the data from the large-aperture scintillometer observation system.According to the actual drought grade of spring maize obtained by soil relative humidity,the drought grade of RCWDI was reconstructed and verified by the data of 2019.The results showed that there was a signifiicant correlation between precipitation and actual evapotranspiration during the fertility period of spring maize in 2021 in Huailai County,and the cumulative value of the difference between precipitation and evapotranspiration could reflect the drought situation of spring maize.The drought of spring maize in Huailai County in 2021 mainly occurred from sowing to jointing stage.Drought ratings obtained by RCWDI in 2019 are up to 80％similar to those based on soil moisture.The study shows that the revised crop water deficit index and its drought grade based on scintillation flux have certain applicability.
scintillation fluxdroughtcrop water deficit index(CWDI)spring maize
NETL
NSTL
万方数据
