PROPOSAL AND INVESTIGATION OF A METHOD FOR ESTIMATING SURFACE-ENERGY BALANCE IN REGIONAL FORESTS USING TM DERIVED VEGETATION INDEX AND OBSERVATORY ROUTINE DATA

Taking forest areas specified according to information on the National digital land data, the vapour pressure deficit at leaf temperature an d the degree of stomatal opening were presumed using the vegetation in dex of forest areas derived from Landsat TM data. Assuming the princip le of Monin-Obukhov similarity is correct, a new method for calculatin g the latent and sensible heat fluxes of regional forests was proposed taking into account the difference in Leaf Area Index. The relation o f the increase of latent heat flux with the vegetation index was obtai ned, and the plane distribution of latent and sensible heat fluxes in large areas is calculated.