四种水生植物对富营养化水体中磷去除效果的研究

采用离子耗竭法研究了空心莲子草、风眼莲、碎米莎草、空心菜四种水生植物根系磷吸收动力学特性。结果表明，四种水生植物对磷的最大吸收速率（Imax）和亲和力常数（Km）均存在显著差异。空心莲子草适宜处理含磷浓度较高的污水，碎米莎草适宜处理含磷浓度较低的污水。对于人工湿地除磷而言，选用碎米莎草最为有效。

Study on effect in removing of phosphorus from eutrophic water by four aquatic plants

Ion depletion technique was adopted to study root phosphorus （P） uptake kinetics of four aquatic plants （Alternanthera philoxeroides Griseb, Eichhornia crassioes Sohns., Cyperusiria L arid Ipomoea aquatica）. Results showed that there was significant difference in P uptake kinetic parameters （Imax,Km） among four aquatic plants. Alternanthera philoxeroides Griseb and Cyperusiria L were more suitable for the removal of high and low concentrations of P, respectively. As to the constructed wetland, Cyperusiria L was more effective for the removal of P.