城市人工湖的生态治理

Ecological management of urban artificial lake

为探究城市人工湖生态治理方式,依据水生生物食物链及生物操纵理论,人为对成都锦城湖2号湖进行水生态系统构建;对建成后2号湖的水质及水生植物群落演替进行跟踪监测和分析,评价生态治理效果。结果表明,采用以人为构建各营养级的水生态修复技术,对人工湖水质净化具有良好的效果,运行第1年(2013年)去除氮磷量分别达到7.28 t和0.25 t,水体透明度一直维持在较高的水平,未出现藻类水华现象;运行第2年1—7月削减氮、磷量也分别达到5.6 t和0.29 t,但由于人为因素及高污染负荷的影响,水质出现恶化现象。锦城湖2号湖水体生态建设对于类似人工水体的水质改善和生态工程建设有重要的参考意义。

To supervise the optimal ecological management mode of urban artificial lakes,aquatic ecosystem among artificial Lake Jincheng No. 2 of Chengdu City is constituted on the basis of biological manipulation theory. Subsequently,water quality and the succession of aquatic macrophytes community in Lake Jincheng No.2 were tracked and investigated to assess the effort of ecological management. The results illustrated that,this ecological restoration technique,building the various aquatic-trophic levels artificially,was an effective treatment process for improving water quality in Lake Jincheng No. 2. The amount of nitrogen and phosphorus removed by the water treatment process were reached up to 7. 28 t and 0. 25 t,respectively,in the duration of the first year management. The Secchi disc depth was maintained at a high level. No water-bloom was observed during the first year. The amount of nitrogen and phosphorus were removed 5. 6 t and 0. 29 t,respectively during January to July in the following year. Nevertheless,the relentlessly deteriorated water quality and aquatic ecosystem attribute to highly polluting water drains into the lake and remaining man-made impacts.Overall,our research enlarges the horizon of related studies as the reference of the similar ecological management project.