Testing on Anti-wind Erosion Effect of Soil for Crop Stubble Coverage Farmlands

Abstract:

Soil erosion experiment was conducted by the way of field fixed poison measurement by taking use of a movable wind erosion tunnel in order to explore anti-wind erosion effect of crop stubble coverage farmland in ecotone between agriculture and animal husbandry in north areas of Yinshan mountain. The results showed that soil wind erosion amount for all of the five kinds of soil surfaces decreased with the increasing of crop stubble coverage and the anti-wind erosion effect was more remarkable with the increasing of crop stubble coverage at the high speeds. The wind erosion module of farmland soil increased with the increasing of wind speed and the reducing rate of wind erosion module of conservation tillage farmland was 40.42%~77.42% with the wind speed of 12～18m/s in comparison with conventional tillage farmland. The wind erosion module reduced with the increasing of aerodynamic roughness length. Anti-wind erosion effect of conservation tillage farmland will tend to be more significant when its effective width to resist wind erosion reaches to 5.25m.