Wind tunnel test on effect of strip width and crop stubble height on wind erosion modulus

In order to investigate effects of strip width and stubble height on soil wind erosion modulus, in-situ test was conducted at soil wind erosion modulus by a movable wind tunnel in the strip intercropping farmland located at the north foot of Yinshan Mountain. The results showed that crop stubble could protect the intercropping farmland. The erosion modulus reached the minimum in the block keeping whole stubble, the maximum in the whole bare block and the medium in the intercropping strips keeping stubble and autumn ploughed. Effects of different crop stubble on wind erosion modulus were different. Comparing with the whole bare block, the wind erosion modulus decreased by 48.92%-67.39% and 5.22%-34.36% in the autumn-plough strip protected by oat stubble strip and rape stubble respectively. The wind erosion modulus exponentially increased with wind speed. Under the same wind speed, soil wind erosion modulus decreased with the width of strips keeping stubble increased from 0.5m to 3.0 m by power function and decreased linearly with the stubble height increased from 5 cm to 25 cm. The results showed that less tillage and keeping stubble are effective measures to reduce wind erosion.