城市人工湖泊水生植被生态恢复技术

Study on eco-remediation in urban-ponds:restoring submerged macrophytes

本实验在藻类响应型城市人工湖泊中,用围格恢复沉水植被,修复退化的生态系统．结果证明：夏季透明度＜0．4 m时,应用凤眼莲可快速改善透明度,0．30盖度的凤眼莲在夏季30-40 d内使水体透明度从不足0．3 m提高到0．6 m以上,并验证了透明度的改善与盖度的正相关程度．通过短期引种漂浮植物调节水体透明度,成功恢复了菹草+伊乐藻群落,透明度较上年同期稳定提高70%,Chl．a浓度降低50%,水体富营养水平下降,有效修复了生态系统．

In allusion to the algal eutrophication problem of urban shallow lakes, four enclosures were set up in an urban eutrophic pond of Nanjing City to restore submerged macrophytes communities. Results showed that Eichhornia crassipes can be used to improve the transparency of water body, and its effect was relative to its coverage when its coverage was less than 0.3. With the coverage no less than 0.3 Eichhornia crassipes can make transparency improved from lower than 0.3m to higher than 0.6m during 30 to 40 days in summer. The submerged vegetation was availably restored after transparency improved to higher than 0.6m. Compared to the period without submerged vegetation, the transparency of the water body was enhanced 70% and Chl. a concentration were reduced 50% correspondingly