| 摘要: |
| 为探究沉水植物对富营养化湖泊的生态改善作用，于2021年9月—2022年8月对徐州九里湖有、无沉水植物区的水质、沉积物磷形态、浮游植物群落分别进行监测。结果表明，九里湖沉水植物能够增加水体的透明度（SD）和溶解氧（DO），对总氮（TN）有一定程度的削减作用，对总磷（TP）、氨氮（NH3-N）和浊度（TUB）的改善效果最明显，能够有效降低九里湖的富营养化水平。九里湖沉积物中无机磷（IP）对TP含量的贡献最大，占比为64.2%～93.2%。IP当中的盐酸提取磷（HCl-P）占绝对优势。有沉水植物区沉积物中TP和有机磷（OP）含量整体略高于无沉水植物区，说明沉水植物对上覆水中的磷元素沉降有一定的促进作用。九里湖全年共监测到浮游植物7门63属93种，群落密度为2.94×106～7.0×107个/L。除水温较低的1—4月外，蓝藻门中的假鱼腥藻（Pseudanahaena sp.）是其中的优势种。低温情况下，浮游植物密度整体大幅降低，但是绿藻门和硅藻门占比明显提升。沉水植物对浮游植物生长具有很好的抑制作用。香农-维纳（Shannon Wiener）多样性指数结果表明，沉水植物对浮游植物多样性有降低作用。 |
| 关键词: 九里湖 沉水植物 富营养化湖泊 生态改善 |
| DOI：DOI：10.3969/j.issn.1674-6732.2024.01.013 |
| 分类号:X173;X524 |
| 基金项目:江苏省环境监测科研基金项目（2107） |
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| Ecological Improvement of Submerged Macrophytes on Eutrophicationof Jiuli Lake in Xuzhou |
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LI Zhao， WU Tao， CHI Weiwei， PAN Hong
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Xuzhou Environmental Monitoring Center of Jiangsu Province， Xuzhou， Jiangsu 221018， China
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| Abstract: |
| In order to explore the ecological improvement effect of submerged macrophytes on eutrophic lakes， the water quality with and without submerged macrophytes， phosphorus form in sediment and phytoplankton community of Xuzhou Jiuli Lake were monitored from September 2021 to August 2022. The results showed that the submerged macrophytes in Jiuli Lake can increase the transparency (SD) and dissolved oxygen (DO)， reduce the total nitrogen (TN) to a certain extent， and improve the total phosphorus (TP)， ammonia nitrogen (NH3-N) and turbidity (TUB)， which can effectively reduce the eutrophication level of Jiuli Lake. The contribution value of inorganic phosphorus (IP) to TP content in Jiuli Lake sediments was the largest， accounting for 64.2%~93.2%. Hydrochloric acid extractable phosphorus (HCl-P) in IP was dominant. The contents of TP and organophosphorus (OP) in sediments with submerged macrophytes were slightly higher than those without submerged macrophytes， indicating that submerged macrophytes had a certain promoting effect on phosphorus deposition in overlying water. A total of 93 species of phytoplankton in 63 genera and 7 phyla were detected in Jiuli Lake， with a density of 2.94×106~7.0×107 cell/L. Pseudanahaena sp.was the dominant species except in January to April when the water temperature was low. At low temperature， the overall density of phytoplankton decreased significantly， but the proportion of chlorophyta and diatom increased significantly. Submerged macrophytes have a good inhibitory effect on phytoplankton growth. Shannon Wiener index indicated that submerged macrophytes decreased phytoplankton diversity. |
| Key words: Jiuli Lake Submerged macrophytes Eutrophic lake Ecological improvement |
