应用大口径闪烁仪可以自动获取玉米农田的显热通量,结合太阳辐射监测系统测量的净辐射,可以方便地获取 潜热通量和土壤热通量。实验表明,在玉米农田的冠层上的常通量层用大口径闪烁仪测量显热通量,和涡动相 关仪的数据相关度达到0.8以上。在中午的时段,玉米农田的显热通量会下降,与作物蒸腾相关的潜热通量会 达到一天的峰值。大口径闪烁仪在精度和区域代表性上表现出的优势,是农业气象上获取数据资料很好的一个选择。

Using area-average sensible heat fluxes measured with the large aperture scintillometer(LAS), in addition to the net radiation obtained with net radiometers, the latent and soil heat fluxes can be calculated with energy balance equations. Field tests showed there was a good agreement between sensible heat fluxes obtained from an LAS and an EC system. The correlation coefficient was better than 0.8 for daytime in plant canopies. The sensible heat decreased, whereas the evaporation on the surface of the canopy attained its maximum at midday. For applications in which accuracy and area-average are of critical importance for agricultural meteorology, the LAS would be a better choice.