Abstract: According to the observations on the surfaces of sand-holding forest, fixed dune and small-scale remnant of mobile dune in 1984 and 1985, sand fixation and afforestation changed the components of surface heat balance: （1） The surface reflection rate and effective radiation were reduced by 11—19 and 15—19% respectively and an increment of 603.7×10⁸Jm^-2 in net radiation was obtained during growing season after the fixation of drifting dunes and the establishment of forests. （2） The distribution of heat on the surface was changed due to sand fixation and afforestation. Sensible heat flux and Bowen ratio were reduced by 6—15% and 0.18—0.44% respectively, but latent heat flux was notably increased by 54—90%.

Key words: EM, OL, Pig manure, Effects