6[2]Gburek W J,Sharply A N,Heathwaite L et al. Phosphorus management at the watershed scale:a modification ofthe phosphorus index[J]. J.En viron.Qual,2000,29(1):130-144.
7[7]Leeds-Harrison P B, Quinton J N, Walker M J. Grassed buffer strips for the control of nitrate leaching to surface waters in headwater catchments[J]. Eco Eng, 1999, 12: 299-313.
8[8]Vought L B M, Dahl J, Pedersen C L, et al. Nutrient retention in riparian ecotones[J]. AMBIO, 1994, 23 (6): 342-348.
9[9]Schmitt T J, Dosskey M G and Hoagland K D. Filter strip performance and processes for different vegetation, widths and contaminants[J]. J. Environ. Qual, 1999, 28 (5): 1 479-1 489
