Non-pollution of the Hangbu-Fengle River basin in Chaohu under different land use scenarios

GIS tools and SWAT model were used to study the spatial-temporal distribution of non-point source pollution in the study.Through quantitative analysis of the non-point pollution load of different land use scenarios,the relationship between land use and non-point source pollution was discussed.The results showed that the area of cultivated land play a key role in determination of the load of non-point source pollution in the sub-watershed.Area of arable land is consistent with the amount of the total load of nitrogen and adsorptive load of phosphorus in the three different land use scenarios(1995,2000 and 2008).The non-point source pollution load of farmland is significantly higher than that of the woodland.With the increase of forest area in the watershed,the depth of runoff and the amount of soil and water loss decreased gradually,sediment yields of the watershed and the pollution load also decreased.