4种水生植物对富营养化水体氮磷去除效果的研究

N and P Removal from Eutrophicated Water with Four Hydrophytes

以灯心草、水田芥、菹草和轮藻为试验对象,研究了其在两种不同程度富营养化水体中的生长状况及对水体中总氮(TN)、总磷(TP)、氨氮(NH4+-N)和化学耗氧量(COD)的净化效果。结果表明,在轻度富营养化水体中水田芥效果最好,培养20 d后的水田芥对总氮、总磷、氨氮和化学耗氧量的吸收率分别为75.28%、93.00%、76.35%和83.74%,其它3种水生植物对水体也都有较好的净化效果;在重度富营养化水体中灯心草效果最好,培养20天后的灯心草对总氮、总磷、氨氮和化学耗氧量的吸收率分别为89.30%、83.11%、83.41%和78.56%,但水田芥和轮藻的净化效果相对较差。

Effects on the removal of total nitrogen（TN）,total phosphorus（TP）,ammonia nitrogen（NH4＋-N）and chemical oxygen demand（COD） and growth situation of four hydrophytes in two kinds of eutrophicated water were studied.The hydrophytes including Juncus effuses Linn.,Nasturtium officinale R.Br.,Potamogetom crispus Linn.and Chara inconnexa.The results indicated that in low degree eutrophicated water,N.officinale R.Br.had the best effect,after incubation of 20 days,the removal rates of TN,TP,NH4＋-N and COD were 75.28%,93.00%,76.35% and 83.74%,respectively.The other three plants had a better purifying effect as well.While in high degree eutrophicated water,J.effuses Linn.had the best effect,after incubation of 20 days,the removal rates of TN,TP,NH4＋-N and COD were 89.30%,83.11%,83.41% and 78.56%,respectively.But N.officinale R.Br.and C.inconnexa don＇t have a better purifying effect.