麦田感热通量和潜热通量的测定与计算方法探讨

根据麦田微气象测定资料,用梯度法和地表面能量平衡方程计算感热通量和潜热通量,与热通量测定仪的实测值相比较,其结果非常一致.麦田能量传输主要表现在潜热通量和感热通量,而以潜热通量的方式为主,在有植被覆盖的麦田里潜热通量数值普遍大于麦茬田.这为计算田间能量平衡提供一个有效途径.

A STUDY ON MEASUREMENTS AND CALCULATING METHOD OF SENSIBLE AND LATENT HEAT FLUX OVER A WHEAT FIELD

The sensible heat flux and latent heat fulx were estimated from the profile method and surface energy budget equation during, a micrometeorological experiment conducted over a wheat field and stubble in the summer of 1988. The result had shown fairly good agreement between flux measurements using the fluxatron and those estimated from the gradient method, the transfer of energy over a wheat field are conducted by latent and sensible heat flux, and the former is the main forms. The latent heat flux over a wheat field are greater than those over a stubble. This provides an efective method to calculate energy balance over a field.