Abstract:

To study the soil erosion changes under different vegetation farmland around Beijing suburb and propose dust farming systems in Beijing suburb, the research was carried out on the farm land surface by means of the movable wind tunnel in order to evaluate quantitatively erosion effects of different farm land. The results showed: vegetation cover could significantly reduce the amount of soil erosion in the winter and spring, When wind speed was constantly 20 m/s, the anti-erosion ability of five vegetations in the middle of March were Winter wheat and triticale>alfalfa>spinach and rape, winter wheat highest on 20 cm to the surface, triticale highest on 100 cm to the surface, and rape lowest on 20 cm, spinach lowest on 100 cm. When comed to the middle of April, the anti-erosion ability of five vegetations were spinach>rape>alfalfa >winter wheat and triticale, triticale lowest on 20 cm, winter wheat lowest on 100 cm. The soil erosion modulus of five vegetations showed the same modulus, 100 cm’s outweigh 20 cm’s slightly. In different treatment of straw and stubble on the topsoil, erosion modulus in over arable land was higher than no-tillage land, and remaining stubble over arable farmland showed highest, pole stand land showed lowest. The erosion modulus in straw chopping tillage was greater than the remaining stubble tillage, while reversed in April. Vegetation cover, no-tillage and stubble returned could reduce the amount of soil erosion in the winter and spring.