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1、ARTICLEINPRESSQuaternaryScienceReviews23(2004)1669–1679HolocenevegetationvariationintheDaihaiLakeregionofnorth-centralChina:adirectindicationoftheAsianmonsoonclimatichistorya,b,cdeaJuleXiao*,QinghaiXu,ToshioNakamura,XiaolanYang,WendongLiang,fYoshioInouchiaInstituteofGeologyandGeo
2、physics,ChineseAcademyofSciences,P.O.Box9825,Beijing100029,ChinabInstituteofEarthEnvironment,ChineseAcademyofSciences,P.O.Box17,Xian710075,ChinacCollegeofResourcesandEnvironment,HebeiNormalUniversity,Shijiazhuang050016,ChinadCenterforChronologicalResearch,NagoyaUniversity,Nagoya4
3、64-8602,JapaneInstituteofGeography,HebeiAcademyofSciences,Shijiazhuang050011,ChinafDepartmentofEarthSciences,FacultyofScience,EhimeUniversity,Matsuyama790-8577,JapanReceived15May2003;accepted12January2004AbstractDH99asedimentcorerecoveredatthecenterofDaihaiLakeinnorth-centralChin
4、awasanalyzedat4-cmintervalsforpollenassemblageandconcentration.Thepollenrecordspanningthelastca10;000yrrevealedadetailedhistoryofvegetationandclimatechangesovertheDaihaiLakeregionduringtheHolocene.Fromca10,250to7900calyrBP,aridherbsandshrubsdominatedthelakebasinincompanywithpatch
5、esofmixedpineandbroadleavedforests,indicatingamildanddryclimaticcondition.Overthisperiod,thewoodyplantsdisplayedanincreasingtrend,whichmaysuggestagradualincreaseinwarmthandhumidity.Theperiodbetweenca7900and4450calyrBPexhibitslarge-scalecoversofmixedconiferousandbroadleavedforests
6、,markingawarmandhumidclimate.Changesinthecompositionoftheforestsindicatethatbothtemperatureandprecipitationdisplayedobviousfluctuationsduringthisperiod,i.e.,coolandhumidca7900–7250calyrBP,warmandslightlyhumidca7250–6050calyrBP,warmandhumidbetweenca6050and5100calyrBP,mildandslightl
7、yhumidca5100–4800calyrBP,andmildandhumidca4800–4450calyrBP.TheperiodcanbeviewedastheHoloceneoptimum(characterizedbyawarmandmoistclimate)ofnorth-centralChina,withthemaximum(dominatedbothbywarmesttemperaturesandbyrichestprecipitations)occurringfromca6050to5100calyrBP.Duringtheperio
8、dofca4450–2900calyrBP,thewoodyplantsdecl
