Vehicles rolling impact on the soil main nutritional components and the underground biomass of the sandy meadow grassland

Through field investigation of Hulunbeier sandy meadow grassland which was roller compacted by vehicle and relevant samples by laboratory analysis, the research was made on grassland vegetation and soil changes caused by the vehicles rolling.The results showed that the grassland underground biomass, soil organic matter, soil total nitrogen, soil available nitrogen and phosphorus significantly decreased with increased of the roller compacted extent which resulted in depth rut(P0.05), available K increased firstly and then decreased. Vehicle rolling destructed above-ground plant communities and roots, significantly reduced in below-ground biomass and soil nutrients, and promoted wind erosion which led to the loss of topsoil. Therefore, control of the vehicle rolling and protection of grassland vegetation and topsoil are extremely important to prevent soil erosion break formation caused by vehicle rolling and to combat grassland desertification.