Investigation on Eutrophication Status and Ecological Purification Methods of Lakes in Xuchang City
Selecting urban landscape lakes such as West Lake,East Lake,and Luming Lake as research objects,five water quality indicators including Chlorophyll a(Chla),Total Phosphorus(TP),Total Nitrogen(TN),Trans-parency(SD),and Permanganate Index(CODMn)were tested.The results showed that the TN content in Luming Lake and Donghu Lake did not exceed the Class Ⅴ standard for surface water(TN≤2 mg/L);the TP content in Luming Lake and West Lake does not exceed the Class Ⅳ standard for surface water(TP ≤0.1 mg/L);the CODMn content in all three lakes did not exceed the Class 11 standard for surface water(CODMn≤ 4 mg/L);the Chla content in three lakes was West Lake＞East Lake＞Luming Lake,and there were three sampling points in West Lake with Chla≥10 mg/m3;the average SD was Luming Lake(2.15 m)＞West Lake(1.09 m)＞East Lake(0.73 m).On this basis,Huangchangpu and Iris were used to purify eutrophic water bodies of two aquatic plants.It was found that both aquatic plants could effectively reduce the eutrophication indicators of water bodies.The TN and TP content in the water bodies after absorption and purification by the two ornamental plants were signifi-cantly lower than the blank control.Huangchangpu's TN removal rate could reach 95.50％.The relative purifica-tion effect of Luan tail is relatively low.Compared with the control,its removal effect on TN and TP was still sig-nificant.Therefore,it was believed that Iris has potential sewage purification ability.
landscape water bodieseutrophicationpurification experiment
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NSTL
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