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1、化石摇蚊与水深之关系：一种西北干旱区水文气候变化重建工具中国科技论文在线////0>.Relationshipbetweenfossilchironomidandwaterdepth:atoolforreconstructingpasthydroclimaticchangesinarid#5NorthwesternChina12311JianhuiChen,EnlouZhang,StephenJBrooks,XiaozhongHuang,HaipengWang,11*JianbaoLiu,FahuChen1.MOEKeyLaboratoryofWesternChi
2、na’sEnvironmentalSystem,LanzhouUniversity,Lanzhou730000,China;102.StateKeyLaboratoryofLakeScienceandEnvironment,NanjingInstituteofGeographyandLimnology,ChineseAcademyofSciences,Nanjing210008,China;3.DepartmentofEntomology,TheNaturalHistoryMuseum,LondonSW75BD,UKAbstract:Asignificantrel
3、ationshipbetweenthedistributionandabundanceofchironomidsandwaterdepthhaslongbeenrecognized.However,fewstudieshavebeencarriedoutonthistopicinarid15regionswherethechironomidcommunityisusuallycontrolledbywatersalinity.ThusBostenLake,the2largestinlandfreshwaterlakeapprox.1200kminChinaandl
4、ocatedinthenorthwestofthecountry,providesauniqueopportunitytoinvestigatethisrelationshipinanaridregion.Atotalof42surfacesedimentsamples,fromwaterdepthsof0mto17m,and12chironomidtaxawereusedintheanalysisThefirstPCAaxisexplained59.3%ofthevarianceinthechironomidassemblageandtherewasa220si
5、gnificantcorrelationbetweenPCAaxis1scoresandwaterdepthr0.84,P0.001.Thechironomidassemblagessignificantlychangedat8.0m.Thisthresholdcorrespondedtoanabruptchangeintheunderwaterslopesandthespatialpatternofaquaticvascularplants.RDAshowedthattheabundanceofChironomusplumosus-type,Microchiro
6、nomusandCryptochironomuswaspositivelycorrelatedwithwaterdepth,whereastheabundanceofTanytarsus,Polypedilumnubifer-type,25CricotopusandPsectrocladiussordidellus-typewasnegativelycorrelatedwithwaterdepth.Theseecologicalrelationshipshavebeensupportedbytheliterature.Thequalitativechironomi
7、d-inferredchangesinlakelevelandqualitativediatom-inferredchangesinsalinityfromasedimentcoreBSTC001werealsocompared.Thecloseagreementintrendsofthesetwovariablesvalidatestheuseofchironomidassemblagestostudypalaeo-hydrologicalvariabilityinthiswesterly-dominatedarid30region.Keywords:Physi
8、calGe
