Understanding the estimation of sensible heat flux on heterogeneous underlying surface of farmland is of great environmental importance for alleviating ecological pollution and adapting agricultural water management. Data measurements were conducted to evaluate the difference of sensible heat flux under large aperture scintillometer (H-las) and eddy covariance (H-ec) under various underlying surfaces in North China Plain. Four typical periods represented as the crop periods (January, March, May, and August) were selected to investigate the correlation between the H-las and H-ec as well as relative error assessment. Results showed that the H-las and H-ec were consistent on the non-uniform underlying surface as time; the correlation coefficient (R²) were 0.75 in January, 0.65 in March, 0.65 in May, and 0.60 in August, respectively; the coverage of LAS footprints was 45 times that of single-point observations. In the prevailing wind direction, most of the EC source areas were homogeneous farmland, while the LAS source areas also include residential areas and woodland; the H-las was slightly higher than H-ec by 1.61–21.21%, which results from the non-uniformity of underlying surface, the variation of meteorological factors, the inconsistency source areas, and the deviation of EC. The method of LAS is recommended for measuring average sensible heat flux in this study area accordingly.

了解农田异质下垫面显热通量的估算对于减轻生态污染和适应农业用水管理具有重要的环境意义。进行了数据测量，以评估华北平原不同下垫面下大口径闪烁仪（H-las）和涡动协方差（H-ec）下显热通量的差异。选择了四个典型的农作物时期（一月，三月，五月和八月）来研究H-las和H-ec之间的相关性以及相对误差评估。结果表明，随着时间的推移，H-las和H-ec在不均匀的下表面上是一致的。相关系数（R ²）分别为1月的0.75、3月的0.65、5月的0.65和8月的0.60；LAS足迹的覆盖范围是单点观测的45倍。在盛行的风向中，大多数欧共体源区是均匀的农田，而阿拉斯加源区也包括居民区和林地；H-las比H-ec略高1.61-21.21％，这是由于下垫面的不均匀性，气象因素的变化，源区的不一致以及EC的偏差所致。建议使用LAS方法来相应地测量该研究区域中的平均显热通量。