关键词: 非均匀地表, 地表能量通量, Landsat TM, 地面观测, 黑河中游

Abstract: Dealing with the regional land surface heat fluxes and evaporation(evapotranspiration) over inhomogeneous land surface of the middle reaches of the Heihe River is an important but not easy issue. In this study, two parameterization methods based on satellite remote sensing and field observations are proposed and tested for deriving the regional land surface heat fluxes over inhomogeneous landscapes. As cases study, the methods are applied to the middle reaches of the Heihe River. Two scenes of Landsat TM data used in this study are 9 July 1991 and 21 August 1995. The regional distributions of land surface variables, vegetation variables and land surface heat fluxes over inhomogeneous landscape of desertification area are obtained in this study. Further improvement of the methods is also discussed.

Key words: inhomogeneous land surface, land surface heat fluxes, Landsat TM, field observation, the middle reaches of the Heihe River