Abstract: Based on the data observed in the growing season (Apr.to Oct.,1989),the differences in energy balance between several vegetations,dominant on the West-Shanxi Loess Plateau,were analysed and compared.It was shown that the albedo differed with vegetations.Under insignificant differences in total solar radiation, the net radiations differed from each other obviously with small differences in effective radiation.Certain differences were found in soil heat flux (Q_s), sensible explicit heat nux(H) and latent heat flux(LE) between difltrent vegetations.According to the daily varying curve of latent heat flux, grass lands and locust stands had no"midday-naps",but Chinese pine sands and seabuckthorn stands had.The daily average evapotranspiration of locust stands was 0.06 mm/d more than that of Chinese pine stands.The daily average evapotranspiration of Chinese pine stands was 0.14mm/d more than that of seabuckthorn stands.The daily average evapotranspiration of seabuckthorn was 0.34mm/d more than that of grass lands and the daily average evapotranspiration of grass land was 0.36mm/d more than that of bare land.The evapotranspiration of stands was shout 1.3 times that of grass land and the evapotranspiration of grass land was aslo about 1.3 times that of bare land.

Key words: Vegetation, Energy balance, Bowen-ratio, Loess Plateau

CLC Number: 

• S311