6Carpenter S R,Caraco N F, Correll D L,et al. Non-point pollution of surface waters with phosphorus and nitrogen [J].Ecology,1998,8: 559-568.
7Leon L F, Soulis E D, Kouwen N. Non-point source pollution:A distributed water quality modeling approach[J].Water Research, 2001,35(4):997-1007.
8Voutsa D, Manoli E, Samara C, et al. A study of surface water quality in Macedonia Greece: Speciation of nitrogen and phosphorus [J].Water, Air.and.Soil Pollution,2001,129:13-32.
