水生植物对水体中氮、磷的吸收与抑藻效应的研究

研究了不同水生植物对富营养化水体氮、磷的净化效果及其抑藻效应。结果表明:金鱼藻(Ceratophyllum demersum)、苦草(Vallisneria spiralis)、空心菜(Ipomoea aquatica)、浮萍(Lemna minor)和菹草(Potamogetom crispusLinn)对富营养化水体中总氮、总磷、硝态氮、氨氮都有较好的去除作用,其中以空心菜和金鱼藻效果最好。培养21d后的空心菜对总氮和硝态氮的吸收率分别为76.93%和71.9%;培养21d后的金鱼藻对总磷和氨氮的吸收率分别达到了93.15%和91.2%。水葫芦(Eichhornia crassipes)、金鱼藻、浮萍都具有较好的抑制藻类生长的作用,培养过以上3种水生植物的水体也表现出抑藻效应。

STUDY ON THE REMOVAL OF NITROGEN,PHOSPHORUS AND INHIBITING EFFECT OF ALGAE GROWTH BY AQUATIC PLANTS

Effects of aquatic plants on the removal of nitrogen and phosphorus in eutrophicated water body and its alga-inhibiting action were studied.Results showed that aquatic plants such as Ceratophyllum demersum,Vallisneria spiralis,Ipomoea aquatica,Lemna minor and Potamogetom crispus Linn had the great ability to remove total nitrogen(TN),total phosphorus(TP),nitrate nitrogen and ammonia nitrogen in eutrophicated water.After incubation of 21days,the removal rates of TN and nitrate-nitrogen by I.aquatica were 76.93% and 71.9%,respectively.And the removal rates of TP and ammonia nitrogen by C.demersu were 93.15 % and 91.2%,respectively.Results also indicated that E.crassipes,C.demersum,L.minor,as well as their cultured water,had remarkable alga-inhibiting action.