20364.中更新世以來(lái)蘇北盆地xh2孔的古植被與古氣候研究

1、學(xué)位論文獨(dú)創(chuàng)性聲明本人鄭重聲明：所提交的學(xué)位論文是本人在導(dǎo)師指導(dǎo)下進(jìn)行的研究工作和取得的研究成果。本論文中除引文外，所有實(shí)驗(yàn)、數(shù)據(jù)和有關(guān)材料均是真實(shí)的。本論文中除引文和致謝的內(nèi)容外，不包含其他人或其它機(jī)構(gòu)已經(jīng)發(fā)表或撰寫(xiě)過(guò)的研究成果。其他同志對(duì)本研究所做的貢獻(xiàn)均已在論文中作了聲明并表示了謝意。學(xué)位論文作者簽名：沖旭亞日期：≯l弓；。學(xué)位論文使用授權(quán)聲明研究生在校攻讀學(xué)位期間論文工作的知識(shí)產(chǎn)權(quán)單位屬南京師范大學(xué)。學(xué)校有權(quán)保存本學(xué)位論文的電子

2、和紙質(zhì)文檔，可以借閱或上網(wǎng)公布本學(xué)位論文的部分或全部?jī)?nèi)容，可以采用影印、復(fù)印等手段保存、匯編本學(xué)位論文。學(xué)?？梢韵驀?guó)家有關(guān)機(jī)關(guān)或機(jī)構(gòu)送交論文的電子和紙質(zhì)文檔，允許論文被查閱和借閱。(保密論文在解密后遵守此規(guī)定)’’保密論文注釋?zhuān)罕緦W(xué)位論文屬于保密論文，密級(jí)：垡塹保密期限為——年。學(xué)位論文作者簽名：凈7@亞指導(dǎo)教師簽名：日期：W、多≥。日期：垡熊扣，1RJ『pAbstractAbstractnlereisaseriesofsi口ific肌

3、tclimatetmsitionintheglob“climatet眥sfomofMiddlePleistocene，oneisMiddlePleiStoceneTrallsition(MPT)andaIlothersi盟i矗cantclimatechangeisMidBmIlllesevent(MBE)ThesetrallsfornlationeVentsindi髓rentregionsofclimatea11dVegetationc

4、haJlgearethecurrentglobalchangeresearchhotspotBecauseofSubeiBasinisinttlenonhemedgeoftheChina’seastemmonsoontriallgle，soitsVegetationarldclimateinnuencedbythemonsoonThenwechooseittoconductresearchandt11iscanreVealthewell

5、beingofsensitiVitytonuctuationsinclimateandVegetationoftlleregionduringmeQuatemaryandmeeV01utioneVidenceofEastAsiallmonsoonTakenfromthe5818084mcontinuouscoreattheuppersectionoftheXH2holeintlleSubeiBasinrecordedclimatecha

6、llgeinfomationsincethemiddlePleistoceneIntllispaper，wemainallalysisthepoUendataofXH2holeaIldtllentheinitialestablisllIIlentt11eevolutionoftheclimatea11dvegetationtmsitionatMiddlePleistoceneBythecomp撕sonofATbospercentaged

7、ataandclimateofthedeep—seaoxygenisotopeandmagneticsusceptibilit)rofloessstrati口aphiccorrelation，combined謝th14CaJldmelossMa盟eticsusc印tibilit)rdata，wecontraSttheagea11dlayersequence丘omMidPleistoceneofXH2holeCombinesdaCapro

8、cessingandanalysis，wediVidethePleistocenebiostrati孕印hicinto14pollenaSsemblagezones，giVent11elimitsofaccuracyofthep01lenaSsemblages、ⅣitllsimilarVegetationsuccessionintheme昭erprocess，aIldfinaUydiVideintofoUowingseVeralsucc

9、ession：808475m，containingdeciduousbroad1eaVedforest7553m，eVergreendeciduousbroadleaVedforest一5345m，deciduousforest45—30m，eVergreendeciduousbroadleaVedforest一30—1Om，containingdeciduousbroadleaVedforest一1O一581m，reedsVegeta

10、tion7111ed印ositionrecordsmeSubeiBaSinXH2holeSincethemiddlePleistoceneshowssigIlificantcoolingeVentoccurredatMIS16andMISl2，resultinginasigllificantchaIlgeinVegetationcompositionAtmeMISl917p嘶od，t11eluShsubtr叩icalcommondeci

11、duousbroadleaVedspeciesofCarya，PlataJlus，JuglaIlsa11dlatelymorerdeciduousbroad—leaVedCeltisallhaVearapiddecreaSe骶ndinmeMIS16stageBeforeandaRerMIS12period，ArborspercentagewaSsignificantly11i曲erthaIlmepercentageofHerbperCe