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1121*111000122430062。201473。37618270．41mg·L－170%Mougeotiasp．0．18mg·L－110m。、pH。、pH、。。SpatialdistributionofphytoplanktoncommunityduringsummerstratificationinLakeFuxian．NIUYuan1KONGXiang-Hong12YUHui1*LIUQian11ＲesearchCenterforLakeEcologyandEnvironmentChineseＲesearchAcademyofEnvironmentalSciencesBeijing100012China2FacultyofＲesourcesandEnvironmentHubeiUniversityWuhan430062China．AbstractLakeFuxianisatypicaldeepoligotrophiclakelocatedinYunnan-GuizhouPlateau．Inordertoexplorethespatialdistributioncharacteristicsofthephytoplanktoncommunityanditsin-fluencingfactorsstratifiedsamplingincludingthreesiteswasconductedinJuly2014．Atotalof37speciesbelongingto27genera18familiesand6phylawereidentifiedinoursurvey．Theaveragebiomassofphytoplanktonacrossthewholelakewas0．41mg·L－1ofwhichChloro-phytaexceeded70%．Mougeotiasp．whichbelongstoChlorophytawastheabsolutelydominantspecieswithabiomassof0．18mg·L－1．Inhorizontaldistributionbiomassofphytoplanktonwashigherinthenorththanthoseinthemiddleandsouth．Inwatercolumnphytoplanktonwasmain-lydistributedinepilimnionandthermoclinelayerswithamaximumoccurringatadepthof10mandthebiomassdecreasedremarkablyinhypolimnionlayer．Correlationanalysissuggestedthatbiomassofphytoplanktoninepilimnionandthermoclinelayerswasmainlyinfluencedbywaterdepthaccompaniedwithwatertemperatureandlightwhileinhypolimnionlayerthekeyaf-fectingfactorswereDOandpH．Ｒedundancyanalysisdemonstratedthatenvironmentalvariableswellexplainedthevariationsinphytoplanktoncommunities．Watertemperatureelectricconduc-tivityandpHplayedkeyrolesinstructuringphytoplanktoncommunitieswhiletheroleofNandPnutrientswasnotsignificant．KeywordsLakeFuxianphytoplanktonthermoclinelayerspatialdistribution．“”“”“”。2015-10-222016-04-07*E-mailyuhui@craes．org．cnChineseJournalofEcology20163571865－1871DOI10．13292/j．1000－4890．201607．019。2012。、、、Ｒeynolds1971Schindler1977Shenetal．2003Zhangetal．20052006。、2010。102°49'E—102°57'E24°21'N—24°38'N。212km2157．3m2008。207010～12m5～6m199820082010．52007。、、1996Zhangetal．20052007Zhangetal．20072009。。2014、。11.120147N24°33'46″N102°51'28″E、M24°29'40″N24°29'40″ES24°24'35″N102°51'4″E315L1Fig．1LocationsofthesamplingsitesinLakeFuxianSchindler0m50m5m50m10m。N135m17M107m16S77m1346。21L15mL。1.2ＲBＲXＲX-620WT、pH、DOCond。TP、TN《》1990。1.315mLLugol1L48h50mL。0．1mL20mm×20mm10×40100。《》2006。1.4SPSS17．0Pearson。SPSS17．00．05。DCA＜2ＲDACANOCO4．5。668135722.11。GB3838-2002Ⅰ。pH。。0．01mg·L－1。、31。≥0．2℃·m－11982315～40m25m0．32℃·m－12。“S”10m25m50m。10m201210～25m2。pH8．390～20mpH。2012。1±Table1Environmentalfactorsmean±SDofLakeFuxianinthepresentstudyWT℃pHDOmg·L－1CondmS·cm－1CODMnmg·L－1TNmg·L－1TPmg·L－1S18．05±4．328．40±0．095．94±0．680．28±0．022．15±0．260．14±0．030．01LM17．22±4．218．39±0．096．05±0．990．28±0．021．93±0．180．12±0．030．01LN17．32±4．418．44±0．086．35±1．290．28±0．021．57±0．160．20±0．080．01L23．92±0．83a8．53±0．03a7．35±0．52a0．31±0．00a2．12±0．37a0．14±0．03a0．01L17．58±2．32b8．34±0．03b6．50±0．66b0．28±0．01b1．74±0．24b0．16±0．05a0．01L14．08±0．35c8．34±0．02b5．08±0．59c0．26±0．00c1．80±0．24b0．16±0．08a0．01L17．56±4．248．39±0．096．13±1．030．28±0．021．87±0．320．16±0．060．01L0．01LWTa、b、cN135mM107mS77m。2Fig．2VerticalvariationofphysicalparametersinthewatercolumnofLakeFuxian76812.23761827。2。5%Mougeotiasp．Oocystiselliptica25．4%35．5%。0．18mg·L－145%。Zhangetal．2005Zhangetal．200720082000。TＲeynolds1997。-Salmaso2002。。、0．09、0．0860．02mg·L－122%、21%5%。Zhangetal．20052008。2.32.3.1S、MN0．37、0．350．47mg·L－1N。3。2008。TN2、Table2Numberofspeciesaveragebiomassanddomi-nantspeciesofdifferentphylaofphytoplanktoninLakeFuxianmg·L－1Cyanaphyta20．001Chlorophyta200．29Mougeotiasp．、Bacillariophyta80．002OocystisellipticaCryptophyta40．01Pyrrophyta20．09Chrysophyta10．02Total370．413Fig．3HorizontaldistributionofphytoplanktonbiomassofdifferentphylainLakeFuxianNMS。2.3.24。S0．37mg·L－10～15m0．67mg·L－110m0．82mg·L－115m。NM0．47mg·L－10．35mg·L－10～20m0．75mg·L－10．6mg·L－110m。20m。20m。10mBehrenfeldetal．1997。Mou-geotiasp．Oocystiselliptica。SPSS。。Pearson3、pH、P＜0．01P＜0．01。、86813574Fig．4VerticaldistributionofphytoplanktonbiomassatdifferentsamplingsitesinLakeFuxianpHP＜0．01、。pH4P＜0．01。pH。CODMn、2012。2.4ＲDA5%53PearsonTable3PearsoncorrelationofphytoplanktonbiomassandenvironmentalfactorsinepilimnionandthermoclinelayersofLakeFuxianBiomassDepthCODMnWTpHDOCondTNTPBiomass1Depth－0．678＊＊1CODMn0．147－0．543＊＊1WT0．720＊＊－0．943＊＊0．3921pH0．753＊＊－0．889＊＊0．3430．890＊＊1DO0．547＊＊－0．308－0．3390．4130．656＊＊1Cond0．728＊＊－0．933＊＊0．3950．978＊＊0．884＊＊0．3891TN－0．0840．412－0．392－0．191－0．2600．117－0．2191TP－0．112－0．1450．377－0．0190．058－0．142－0．040－0．5181*P＜0．05＊＊P＜0．01。4PearsonTable4PearsoncorrelationofphytoplanktonbiomassandenvironmentalfactorsinhypolimnionlayerofLakeFuxianBiomassDepthCODMnWTpHDOCondTNTPBiomass1Depth0．1271CODMn－0．261－0．0821WT－0．182－0．777＊＊0．018*1pH0．611＊＊0．492*－0．491－0．475*1DO0．628＊＊0．38－0．777＊＊－0．458＊＊0．741＊＊1Cond－0．214－0．434*0．1240．799＊＊－0．385－0．473*1TN0．351－0．229－0．6800．0180．2400．499－0．1601TP0．0670．0950．1260．062－0．0170．0220．036－0．2641*P＜0．05＊＊P＜0．01。9681、、、8pH、Depth、WT、TN、TP、Cond、DOCODMnＲDA。ＲDA50．3250．14346．8%8。21．2%20．4%、pH19．5%、DO15．7%、Depth13．4%、CODMn4．4%、TN3．34%TP1．1%。、pH、CODMn。ＲDA、。。pHKlugetal．2000。Sammer1987Sal