Carbon Exchange Characteristics of Fenced and Natural Grazed Grassland in Loess Plateau A comparative study on soil respiration between grazing and fenced typical Leymus chinensis steppe,Inner Mongolia Carbon and nitrogen sequestration rate in long-term fenced grasslands in Inner Mongolia, China Characteristics of the soil seed bank and the seedling bank in fenced sandy meadow Formation mechanism and community characteristics of fenced grassland in desert steppe