蠡湖综合整治十年来水环境变化的研究
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2020-02-26 11:44:50
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书第28卷第2期2014年6月干旱环境监测AridEnvironmentalMonitoringVol.28No.2Jun..2014收稿日期:2013-12-09;第二次修回日期:2014-01-09基金项目:国家水体污染控制与治理科技重大专项(2012ZX07101-013-06)作者简介:庄严(1982-),男,江苏无锡人,工程师,硕士,主要从事太湖环境质量综合分析与评估工作。蠡湖综合整治十年来水环境变化的研究庄严1,汤小健1,盛翼1,彭宇1,张东云1,邹华2(1.无锡市环境监测中心站,江苏无锡214121;2.江南大学环境与土木工程学院,江苏无锡214122)摘要:对蠡湖2002—2012年湖体水质、富营养化状况和浮游植物种群进行了研究。结果表明,经过十年蠡湖综合整治工程,蠡湖水环境有了显著改善。TN、TP、NH3-N、CODMn和Chl-a浓度分别下降85.2%、70.4%、96.2%、55.3%和81.6%;TLI由70.9降至52.0,水体由中度富营养好转为轻度富营养;浮游植物种群结构有所演变,近二年种群结构呈现明显季节性差异,夏季蓝藻中的微囊藻成优势种,约占整个水体藻类密度的90%以上。蠡湖水质显著改善的同时,藻类水华情况未得到本质好转,在适宜的水文气象条件下易发生藻类水华。建议提高水体透明度,增加水体流动性,为进一步改善蠡湖水环境,乃至改善湖河小流域水环境起积极作用。关键词:蠡湖;富营养化;水质;浮游植物;藻类水华中图分类号:X826文献标识码:A文章编号:1007-1504(2014)02-0049-06TheStudyonWaterenvironmentalImprovementofLihuLakefor10YearsComprehensiveTreatmentProjectsZHUANGYan1,TANGXiao-jian1,SHENGYi1,PENGYu1,ZHANGDong-yun1,ZOUHua2(1.WuxiEnvironmentalMonitoringCenter,WuxiJiangsu214121,China;2.JiangNanUniversity,EnvironmentandCivilEngineeringSchool,WuxiJiangsu214122,China)Abstract:Thewaterquality,eutrophicationandphytoplanktonspeciesofLihuLakewerestudiedinthispaperfrom2002to2012.TheresultsshowedthatLihuLakewaterenvironmenthadimprovedsignificantlybythecomprehensivetreatmentpro-jects.ThedescendrangesofTN,TP,NH3-N,CODMnandChl-aconcentrationwereabout85.2%,70.4%,96.2%,55.3%and81.6%.TLIdecreasedfrom70.9to52.0andthewatereutrophicationlevelimprovedfrommoderate-eutrophi-cationtolight-eutrophication.Theevolutionofphytoplanktonspecieswashappenedin10years.Anditshowsanobviousseasonaldifferenceofphytoplanktoncommunitystructureinthelast2years.Microcystisisthedominantspeciesinsummerwhichisabove90%ofalgaldensity.However,algalbloomsituationdidnotturntothebetterduringthe10years,andalgalbloomwillhappeninappropriatehydrology-weathercondition.Finally,itwassuggestedtoimprovewatertransparencyandincreasewaterflowinordertofurtherimprovingwaterenvironmentofLihulakeoreventhesmalllake-riverbasin.Keywords:LihuLake;eutrophication;waterquality;phytoplankton;algalbloom蠡湖(又名五里湖)位于太湖北部,是太湖伸入无锡内陆的一片水域,为无锡著名的城市景观湖泊[1]。
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