大面积种植红菱对富营养化水体修复效果的影响

利用水生植物修复富营养化水体已成为水体生态修复的一种重要方法。在北太湖水域红菱种植区内外对水体各项指标进行分析研究。研究结果表明,在净水工程实施良好的情况下,由于红菱根茎对底泥营养盐的吸收,以及微生物的硝化、反硝化作用,种植区内TN浓度平均值为1.64 mg/L,低于种植区外3.08 mg/L;种植区内TP浓度平均值为0.049 mg/L,低于种植区外0.127 mg/L;种植区内NH+4-N、NO-3-N、COD浓度也均低于种植区外。在净水工程中断情况下,红菱种植区内叶绿素a浓度和透明度则高于种植区外,充分表明红菱对水体有较明显的净化功能。

Effects on the restoration of eutrophic water by large-scale cultivation of water caltrop

The restoration of eutrophic water by using aquatic plants has become a major method of ecological restoration of water bodies. Thus, in this work, various indicators of water were studied by using Water caltrop which was growing in the northern Taihu Lake. The results indicated that the average concentration of TN and TP were 1.64 mg/L and 0.049 mg/L inside the planting area where the water purification project was carrying out, which were lower than outside (3.08 mg/L for TN and 0.127 mg/L for TP). Because of the constantly absorbing nutrients from the sediment, as well as the microbial nitrification and denitrification happened on the roots. Meanwhile, so the concentration of TN, TP, NH4+ -N and NO3- -N inside the planting area were also below outside. When the water purification project was interrupted, the concentration of transparency, chlorophyll a inside the planting area was higher than that of outside, which indicated that Water caltrop had a relatively strong capacity on water purification.