According to observations on wind velocities of different shelterbelts in Ulan Buh Desert, the paper shows that the defending effect varies with forest belt structure, height and porosity. Wind defending effect of sparse structure shelterbelt is the best, which is 41.37%, porous structure takes the second place, 29.58%, and ventilation structure is the worst, 23.92%. Shelterbelt with a porosity of 40%~50% has the best wind defending effect. With the increase of porosity, the defending effect decreases remarkably. So the structure should be sparse with a porosity of 30%~50%, and the porosity of forest canopy should be 30%~50% and the porosity of trunk, 50%.

Ulan Buh Desert  /  defending effect  /  porosity