用物理-生态集成技术局部控制富营养化

利用物理-生态工程集成技术对贵州省百花湖(水库)麦西河河口富营养水体进行局部生态修复.结果表明,同期内,富营养化指标总氮、总磷、叶绿素和化学耗氧量工程区内明显低于工程区外,最大相差分别为0.61 mg.L-1、0.041 mg.L-1、23.06μg.L-1和8.4 mg.L-1;透明度工程内明显高于工程外,最大超过1.50 m;富营养化指数工程区内明显要低于工程区外,最大相差20,工程区外属于中-富营养化,而工程区内属于贫-中营养化;浮游植物丰度和生物量工程区内低于工程区外,工程区外浮游植物丰度到达2 125.5×104cells.L-1,而工程区内仅33×104cells.L-1.工程区外浮游植物生物量以蓝藻为主,硅藻和甲藻的比例较小;在工程区内,除了部分蓝藻外,硅藻和甲藻的比例较高,还有一部分裸藻.经过1年多的运行,物理-生态集成技术水质改善生态工程有效地控制了工程区内水华的发生,改变了浮游植物群落结构,控制了富营养化趋势,物理-生态集成技术适合贵州高原河口富营养化水质改善.

Eutrophication Control in Local Area by Physic-ecological Engineering

An integrated physical and ecological engineering experiment for ecological remediation was performed at the Maixi River bay in Baihua Reservoir Guizhou Province,China.The results show that eutrophic parameters,such as total nitrogen,total phosphorus,chlorophyll a and chemical oxygen demand from the experimental site(enclosed water) were significantly lower than those of the reference site.The largest differences between the sites were 0.61 mg·L-1,0.041 mg·L-1,23.06 μg·L-1,8.4 mg·L-1,respectively;experimental site transparency was>1.50 m which was significantly higher than that of the reference site.The eutrophic index of the experimental site was oligo-trophic and mid-trophic,while the control site was mid-trophic state and eutrophic state.Phytoplankton abundance was 2125.5×104 cells·L-1 in June,2011 at the control site,but phytoplankton abundance was lower at the experimental site with 33×104 cells·L-1.Cyanobacteria dominated phytoplankton biomass at both sites,however the experimental site consisted of a higher proportion of diatoms and dinoflagellates.After more than one year of operation,the ecological engineering technology effectively controlled the occurrence of algae blooms,changed phytoplankton community structure,and controlled the negative impacts of eutrophication.Integrating physical and ecological engineering technology could improve water quality for reservoirs on the Guizhou plateau.