The erosion gully of loess hilly region is the most serious soil erosion areas.Afforestation for soil and water conservation is the main method of controlling soil erosion in this area.The major site preparation mode for afforestation was fish-scale pits site preparation in southern mountain area of Ningxia and the major trees were small shrubs,such as Seabuckthorn,Hickory,Caragana,and so on.The correlative technique of site preparation,species selection,configuration on erosion gully slope afforestation we...