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时间:2017-12-07
《环流型水域水动力对藻类生长影响》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、万方数据中国环境科学2008,28(9):813~817CllinaEnvironmentalScience环流型水域水动力对藻类生长的影响颜润润1,逄勇卜,赵伟1,李瑞玲1,晁建颖2(1.河海大学环境科学与工程学院,江苏南京210098;2.中国科学院南京地理与湖泊研究所.江苏南京210008)摘要:实验模拟了不同风浪强度、不同营养水平下铜绿微囊藻的生长速率.选取能代表湖流和波浪综合作用的综合摩阻流速作为太湖水动力的表征指标,建立藻增长率和综合摩阻流速关系.结果表明.低、中营养水平下的藻类受扰动的影响规律较为接近,90r/rain
2、扰动时生长最好;而高营养水平下的藻类受扰动影响差异不明显.营养盐对藻类的生长影响较大。扰动可以改变由营养水平不同所引起的藻类生长的差异.铜绿微囊藻在低、中营养水平下生长时最优综合摩阻流速约为0.133cm/s.藻增长率随着综合摩阻流速呈现先指数递增、后指数递减的规律.湖泊环流型水域和河道径流型水域水动力作用存在明显差异.关键词:水动力;综合摩阻流速;营养水平;铜绿微囊藻;太湖中图分类号:X52文献标识码:A文章编号:1000-6923(2008)09-0813-05Influenceofcircumfluenttypewatersh
3、ydrodynamicongrowthofalgae.YANRun—runl,PANGYongp,ZHAOWeiILIRui—ling。,CHAOJian-ying‘(1.CollegeofEnvironmentalScienceandEngineering,HohaiUniversity,Nanjing210098,China:2.NanjingInstituteofGeographyandLimnology,ChineseAcademyofSciences,Nanjing210008,China).ChinaEnvironmen
4、talScience,2008,28(9):813-817Abstract:ThegrowthrateofMicrocystisaeruginosaunderdifferentwindwavestrengthanddifferentnutrientlevelswastestsimulated.Thecomprehensivefrictionflowvelocity,whichiscapableofrepresentingthelakecurrentandwave,wasselectedLakeTaihuhydrodynamicexp
5、ressindex.TherelationbetweenalgaegrowthrateandcomprehensivefrictionvelocityWasestablished.Theinfluencelawsofalgaekinddisturbanceunderlowandmedialnutrientlevelsweresimilar.Thegrowthwagbestwhenthedisturbancewas90r/min,andtheinfluenceofalgaekinddisturbanceunderhigllnutrie
6、ntlevelvariedunobviously.Nutrienthadmajorinfuenceonalgaekindgrowth.Thedisturbancecouldchangethealgaegrowthvariationinducedbydifferentnutrientlevels.Microcystisaeruginosainlowandmedialnutrientlevelswasmostprior:comprehensivefrictionflowvelocitywasabout0.133cm/s,thealgae
7、growthrateappearedfirstindexincreasedbydegreesthandecreasedbydegreelawwithcomprehensivefrictionflowvelocity.Lakecircumfluenttypewatersandriversrunofftypewatershydrodynamicactionexistedobviousvariation.Keywords:hydrodynamic:comprehensivefrictionflowvelocity;nutrientleve
8、l:Microcystisaeruginosa;LakeTaihu在营养盐相对充足、水流缓慢及适宜的气候条件下,湖泊、水库水体发生“水华”现象远多于河流.太湖蓝藻水华的暴发均在大风作用过后的小风或静风、天气晴朗时段,这提示蓝藻水华的出
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