Simulation on the relationship between land use/land cover and the surface runoff in Songhuaba water source region

We combine DEM, land-use, soil, weather etc to drive the SWAT model to simulate 1992-2001 yearly and monthly surface runoff in Songhuaba water source conservation region. According to model calibration, 4 kinds of LUCC scenarios are set to predict the Changes of runoff. The conclusions are as follows: (2)The simulated results show that surface runoff can increase most in S1 (a non-vegetation area), which following by seriously soil and water loss. In S2(farmlands, garden plots becoming woodlands). S3 (habitations, industrial and mining areas, garden plots turning into woodlands) and S4(only woodlands)for closing hill for forestation in different level, S3 can increase surface runoff more obviously. (2)In a long run, moving the people to other places is more benefit for protecting the water than making them engaging other work.