[ Objective ] The control effect of floating plants constructed wetland to nitrogen and phosphorus pollution from rice field drainage was studied. [Method]Firstly,the characteristic of floating plants and the purification principle of pollutants were introduced,and then purification effect was analyzed through controlling nitrogen and phosphorus pollution from rice field drainage by floating plants constructed wetland. [ Result] By means of floating plants constructed wetland, the average removal rate of total nitrogen (TN) from double - season early and late rice field drainage reached 52.17％ and 62.23％, while that of total phosphorus was 45.69％ and 74.37％ ,respectively,with better removal effect. Meanwhile, floating plants have ecological and ornamental value to some extent. [ Conclusion ] Floating plants constructed wetland could not only control nitrogen and phosphorus pollution from field drainage effectively but also keep farmland ecosystem in healthy state.%[目的]研究浮水植物型人工湿地对水稻田排水中氮磷污染的控制效果.[方法]介绍了浮水植物的特点及净化污染物的原理,并通过浮水植物型人工湿地对水稻田排水中氮磷污染物的控制,分析其净化效果.[结果]浮水植物型湿地对双季早晚稻总氮的平均去除率分别为52.17%、62.23%;对双季早晚稻总磷的去除率分别为45.69%、74.37%,总氮、总磷的去除效果均较好.同时,浮水型植物还具有生态价值和观赏价值.[结论]浮水植物型人工湿地不仅能有效控制农田排水的氮磷污染物,而且能维持农田生态系统健康.
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