Drought Farmland Near Surface Blown Sand and Wind Erosion Controlling Effect

Abstract:

Aiming at farmland wind erosion sand calamity, in situ testing was adopted to make test for oat stubble, grave covering and traditional drought farmland by using movable wind erosion tunnel and its matching equipment. In order to provide technical basis, blown sand movement law was researched for the three kinds of farmland, and the mechanism and protection effect of soil erosion were explored for the oat stubble and grave covering affecting drought farmland. It is showed that near surface blown sand movement of oat stubble and grave covering are obviously different from autumn-ploughed farmland, the blown sand movement layer was lifted, near surface wind speed was weakened at different degrees, sediment discharge is less than autumn-ploughed farmland’s and would have maximum value in certain height, because of barrier and evacuation effects of oat stubble and grave covering. By anti-erosion efficiency analyzing, it is showed that oat stubble and grave covering have important effect on drought farmland for wind erosion controlling, and the effect of the latter is less than the former.