Degradation of different riparian vegetation buffer belt to pollutant of non-point source polluted river

The non-point source polluted river water is treated by the degradation of riparian vegetation buffer belt,i.e.reed vegetation belt,reed and bulrush integration vegetation belt.The results indicate that the degradation effect with vegetation belt is better than that without vegetation belt,and the degradation effect of reed and bulrush integration vegetation belt is the best.The weekly removal rates of bulrush and reed integration vegetation belt to COD,TN,TP and NH3—N are 31.62%,37.84%,30.65% and 34.31%.The vegetation belt can withhold the particles in surface runoff and enhance the dissolved oxygen(DO) content in river,which is important to prevent water and soil erosion and to improve the water quality.