Based on the experimental data from cornfields, this paper compared the daily change of evapotranspiration calculated by Bowen ratio energy balance and that calculated by lysimeter.

• 摘要根据实测资料，对波文比计算的蒸发蒸腾量和蒸渗仪实测的蒸发蒸腾量日变化进行比较及分析。