不同季节浮床美人蕉对水体氮素等污染物的去除

 采用浮床无土栽培的方法，以人工模拟水槽为实验场所，在水槽内的富营养化水体表面种植美人蕉，通过植物的吸收和吸附作用，以及微生物的协同作用，去除水体中的氮素。实验结果表明，春季浮床美人蕉对水中氮素的去除效果较好，经过五天的处理，TN去除率约为58.4%；NH⁺⁴-N去除效果显著，2天内去除率达100%。与春季相比，秋季浮床美人蕉对氮素的去除效果有所下降，但去除规律大致相同，经过五天的处理，TN去除率为50.4%；对NH⁺⁴-N的去除效果仍很明显，4天内去除率可达100%。研究结果为浮床植物系统的全年运行提供了科学依据。

Removal of Nitrogen from Water Bodies by Canna Floating Bed in Different Seasons

Canna was planted in the eutrophication water with the technology of soilless culture in a polymethyl flume, and nitrogen was removed by the effection of plants absorbing and sorption, cooperated with bacteria. The experimental results show that nitrogen can be removed more by the canna floating bed in spring than that in autumn. The removal rate of total nitrogen was about 58.4% within five days, and the removal rate of NH⁺⁴-N was 100% within two days in spring. The removal rate of total nitrogen was about 50.4% within five days, and the removal rate of NH⁺⁴-N was 100% within four days in autumn. The removal rule is the same for different seasons.The experimental result is important to the floating bed operating in the whole year.