5Comin F A.Nitrogen removal and cycling in restored wetlands used as filters for agricultural runoff[J]. Wat. Sci. Tech, 1997, 35 (5): 261 -266
6Shutes R B E.The design of wetland systems for the treatment of urban runoff[J]. War. Sci, Tech, 1997, 35 (5):19 - 25
7Fisher M M, Reddy K R. Phosphorus flux from wetland soils affected by long - term nutrient loading [J]. Environ. Qual, 2001, 30(1):261 - 271
8Richardson C J. Long-term phosphorus assimilative capacity in freshwater wetlands: A new paradigm for sustaining ecosystem structure and function[J].Environmental Science & Technology, 1999, 33(10) : 1545 - 1551