关键词: 草原区, 露天煤矿, 土地复垦, 表土, 土壤质量, 植被恢复

Abstract: Grassland opencast coalmine area is located in the soil and water resources arid ecological fragile areas in the west.Therefore，that to achieve the most efficient use of the limited water and topsoil resources in grassland area，plays a crucial role in land reclamation and ecological restoration.Taking East II opencast coalmine in Datang，Inner Mongolia of China as an example，the field investigation method was used to study the soil quality variation under different topsoil storage methods，and to analyze the topsoil quality variation and vegetation restoration effects under different dump platform and dump slope reclamation modes in the grassland opencast coalmine area.Research results show that topsoil plays a vital role in land reclamation in grassland opencast coalmine area，and the heap shape topsoil storage mode is more beneficial to maintain the soil quality and properties.The mode “covering topsoil + covering straws + grass grid + applying fertilization” in dump platform and the mode “covering topsoil + covering straws + grass grid” in dump slope can lead to the best topsoil quality and vegetation restoration effects.But it was still less than the original landscape topsoil quality level.The research can provide technical support and theory basis for land reclamation and ecological restoration in the grassland area.

Key words: Grassland region, Opencast coal mine, Land reclamation, Topsoil, Soil quality, Vegetation restoration