人工附着基对富营养化水体的水质改善研究

Effects of Artificial Substrate Materials on Eutrophic Water Quality Improvement

以工程中常用的人工附着基—聚乙烯网片为材料,比较了3种密度（无网片对照、低密度和高密度）的网片对富营养水体水质的改善效果。研究结果表明,聚乙烯网片的布设密度越高,对水质的改善效果越明显。实验结束时低密度和高密度网片组水体叶绿素a的浓度较之于无网片组分别降低了17.77%和50.95%,总溶解磷分别下降了9.0%和17.22%,总溶解氮分别下降了25%和31%。因此,在富营养水体的生态修复工程中,可以在成本许可的范围内布设较高密度的人工附着基。

An outdoor mesocosm experiment was conducted to compare the effects of three layout densities of artificial substrate （polyethylene piece） on nutrient contents and phytoplankton density in water. Results showed that the dissolved nitrogen, phosphorus and Chlorophyll a （Chl-a） contents in water were all negatively related to the layout densities of artificial substrate. Compared with the treatment without artificial substrate, Chl-a contents in water would decline by 17.77% and 50.95% when the treatment with low and high layout densities of artificial substrate, respectively, at the end of the experiment, whilst dissolved nitrogen and phosphorus contents would do alike, too. It was suggested that in the ecological restoration of eutrophic waters, artificial substrate should be placed with higher densities when the cost being affordable.