Relationship between adjustment of watershed landscape pattern and benefits of runoff and sediment reduction on loess hilly-gully region

Watershed landscape pattern is regulated by small watershed unit, which is an important approach and method to research the distribution pattern of measures of soil and water conservation and to evaluate benefit of soil erosion control. A case study of Lv' ergou watershed is located the loess hilly-gully region of Gansu province. Digital Elevation Model (DEM) was made using GIS and slope and aspect was superimposed. To test the benefits of runoff and sediment reduction after regulating on watershed landscape pattern, the benefits norm of soil and water conservation measures is used. When the land use shift to preferable pattern, the benefits of runoff and sediment reduction by measures of soil and water conservation taken in the research watershed have increased by 20.36% and 21.55% respectively.