Abstract: Through static simulation test，three kinds of submerged plant including Elodea densa（Planch.）Casp．，Ceratophyllum demersum L，Cabomba Fanwort were studied. They were highly efficient in removing total nitrogen（TN），total phosphor（TP）. The change of the biomass at the different nutritional levels was also investigated. The nutritional levels were described by mesotrophic concentration，eutrophic concentration，hyperbolic concentration and stress concentration. The research results indicate that three kinds of submerged hydrophytes are capable of removing nitrogen and phosphorus effectively at the different nutritional levels in the water. At mesotrophic concentration，eutrophic concentration and hyperbolic concentration，Ceratophyllum demersum L showed well TN removal efficiency in the water，Elodea densa（Planch.）Casp．showed well removal efficiency on both TN and TP in the water at the different nutritional levels. At hyperbolic concentration and stress concentration nutritional levels，the removal efficiency of Elodea densa（Planch.）Casp．is higher than Ceratophyllum demersum L，and Cabomba Fanwort.

Key words: submerged hydrophytes, eutrophication, nitrogen, phosphorus, removal efficiency

摘要： 通过静态模拟试验，研究了水蕴草[Elodea densa（Planch.）Casp.]、金鱼藻（Ceratophyllum demersum L）、绿菊（Cabomba carliniana）3种沉水植物在不同营养浓度条件下（中、富、超富和胁迫浓度）对水中氮、磷的去除效果及其生物量的变化。结果表明，在不同营养浓度条件下，3种沉水植物均能去除水体中的氮、磷营养物质。其中，在前3种营养条件下金鱼藻对水中的TN有较好的去除效果，水蕴草在胁迫营养浓度条件下对水中氮的脱除效果较好；水蕴草在4种条件下对水中的TP有较好的去除效果，尤其是在超富营养和胁迫浓度条件下，去除效果远远好于其它两种植物。

关键词: 沉水植物, 富营养化, 氮, 磷, 去除效果