中文摘要：

本文利用安装在山东省位山灌区典型农田内的大孔径激光闪烁仪（LAS）和涡度相关系统（EC）,测定了不同空度尺度上的显热通量,对比分析了两个系统测定结果在不同作物条件下的相关关系,讨论了造成二者偏差的可能原因。结果显示,在研究区域的农田下垫面条件下LAS和EC系统测定的显热通量之间存在较好的一致性;LAS的测量结果略大于EC测量值,这可能是由下垫面不均匀性、二者源区不一致以及EC测量值偏小造成的。研究证明,LAS是测定区域平均显热通量较为可靠的方法。

英文摘要：

This study examined the relationship between LAS （Large Aperture Scintillometer） and EC （Eddy Covariance technique） under different crop conditions in term of the sensible heat flux using the data collected from a typical cropland in the Weishan Irrigation District,Liaocheng city,Shandong province.The results showed that the measurements of LAS and EC are in good agreement in this cropland.But the estimated sensible heat flux by LAS is slightly higher than that by EC,which might be due to either the disagreement in their heterogeneous source areas or the underestimation of EC measurement.LAS could provide a reliable way of measuring area-average sensible heat flux