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Aerodynamic roughness length (zom) is an important parameter for reliably simulating surface fluxes. The parameter varies with wind speed, atmospheric stratification, terrain and other factors; however, variations of this parameter are not properly considered in most models, which may result in uncertainties in simulating surface latent heat and sensible heat flux. There have been few studies of the diurnal and wind-direction dependent variations in zom. This study analyzes the seasonal, diurnal and wind-direction-dependent variations in zom calculated from the profile of meteorological data for two forest systems of China, and explores the mechanism underlying these variations.