49968.黃土高原西部祖厲河中上游19.95.0kabp植被與氣候演化研究

1、Y1088640藺哪矢乎研究生學(xué)位論文論文題且中文)黃土高原西部祖厲河中上辨19950KaBp植被與———————皇拯澶位班盤——————論文題目(外文)Aprenmiaarystudyonthevegetationandclimate研究生姓名學(xué)科、專業(yè)研究方向?qū)W位級別導(dǎo)師姓名、職稱論文工作起止年月論文提交日期論文答辯日期學(xué)位授予日期changesdnring19950KaBPinthemiddle』m垂!￡2Ⅲ墮B垃∞i鰱虹鯉強』女

2、自￡￡瞳絲女————一—————————jLjL——一————————熊廈堂—蒸凰岔韭廈莖———一————j趟j業(yè)理k型溫生疊擅查業(yè)———一————————————目L—二—————————一———————』匹直—茲控——————————』地生生上且至上地王生量且————一—J￡生量且——一———_J!望王且黃商匭酉嫠擔(dān)壓鯉生土濫!呈。壁：5：壘螋揎籃皇皇蠛演化班豇AbstractThispaperdiscussedthereconst

3、ructionofthehistoryofthevegetationandclimatechangesinthemiddleupriverZullRiverduring19950KaBPperiod，accordingtotheenvironmentalandclimaticindexesofpollen，granularityandorganiccarbouetc，basedontheanalysisofpollenabsolutec

4、oncentration，pollenpercentageconcentrationandprincipalcomponentsanalysis(PCA)ofpollen，andMediandiameterOrain(Md)analysisandTotalOrgamcCai[)0nOOC)analysisandthefollowingconclusionsweredrawn：Duringtheperiodof199154KaBP(1as

5、tGMMdnlLaterPeriod)，theclimatewascoldDuringtheforepartofthisperiodespeciallyintheuprivermountainsspmce(Picea)con如rforestswmwelldevelopedandtheclimatewasrelativelycoldandhumid；duringthelaterperiod，spruce(Picea)forestinthe

6、uprivermountainsmightdecadeofevcildisappearwhilePineforestextendedgraduallyinthearidareaappearedsteppevegetationunderarelativelycoldanddryclimateBetweenthesetwoperiodsappearedtworelativelydistincthumidclimatestagesAround

7、154110KaBP∞砒Deglacinl)，thecoverageofthevegetationwereinbetterconditionandtheclimatefluctuatedtempestuouslyIntheuppermountainsvegetationwasdominatedbyPineforestwithopenbroadleavesforestappearedpartlyandtheamofthesteppeenl

8、argedAtthe$ametimethereexistedtwowarnlandhumidclimateperiodsandtwodryandcoldclimateperiodscorrespondingwithlkilingandAlleredEventsandOld咖andYoungerI)ryasEventsDming110550KaBP(EarlyMidHolocene)theclimatewaswarmandhumidand

9、fluctuatedfrequentlyandtempestuouslyTheV耀腳d∞mainlydominatedbyPineforestbroadleavesforesthadanobviousextension；shrubsandherbsw∞welldevelopedItappearedasforeststeppevegetationwhichwasdominatedbyconiferousbroadleavedmixedfo

10、restsAfter72KaBPclimatetendedtohecoldanddryaccordingtothetrendsInstudyareaduringthe19950KaBPperiodclimateshowedaseriesofchange：coldhumidcolddrywarmdrywarmhumidThetrendsoftheclimaticchangesandtheclimateeventshadgoodcohere

11、ncewithrecordsofglobalclimatechanges，especianythetrendofclimatechangessuggestedbyXiaoGonprofileduringLastGlacialLaterPeriod—LastInterglacialHolocenepeTiedwasmostlythesameastheoneshowedbyrecordsofGreenlandIceCoreandGuliya

12、IceCoreThisindicatedthatthecllmatachangesinstudyareaarecontrolledby州climatefactorsThecharactersoftheclimateandvegetationalternationreflectedthatduring19950KaBPperiodthefactorsthatinfluencedtheclimatesystemmightbeverycomp

13、licatedwhichindicatedthecomplicatedinteractionsbetweentheAsianuloiisoonsystemandwesterlyconentaThefurtherstudyontheclimaticmechanicalalternationisrequiredinthisareaKeywords：UpriverpartofZuliRiver19950KaBPperiod，climate，v