洛川地區(qū)末次間冰期古植被演化與還原研究.pdf

1、首都師范大學碩士學位論文洛川地區(qū)末次間冰期古植被演化與還原研究姓名：劉超申請學位級別：碩士專業(yè)：自然地理學指導教師：魏明建20080414ABSTRUCTLastinterglacialageisthemostrecentoneinterglacialIthassomesimilaritytothecharacterofcontemporaryclimateSothelastinterglacialpedodisthefocudperi

2、odoftheclimate—changeresearchThespore—polleninloessistherelicofbiosphereintheQuaternaryperiodAnditrepresentsthevegetationwhentheirstratumformedThevegetationishighsensitivewiththeclimateThechangeofvegetationwillshowthecha

3、racterofclimatefluctuationAsaresult，applyingsporepollenrecordtoreconstructthepaleovegetationevolutionhasbeenanimportantproblemintheglobalchangestudyLuochuanguzuiprofilewasselectedasthestudyobjectWesampledintensivelyby2cm

4、intervalandanalysisthespore—pollenrecordintheloessAndthenthechartofsporepollenpercentageandmassconcentrationhasbeenestablishedforreconstructthepaleovegetationoflastinterglacialageinLuochanareaAndweselectapartofrecordsfor

5、tryingreconstructpaleo—vegetationquantitativelybyusingbiomezationmethodThenwediscussedtheresultandtheerrorThestudyindicatedthreepoint：1Inlastinterglacialperiod，grassland—foreststeppe—grasslandvegetationtypesdevelopedinLu

6、ochuanareaAssemblezoneIIc、IIIb、andIVincludethemassconcentrationpeakAndthepeakinassemblezoneIIIbisweak2ThereareplentyofpoUendiscoveredinSIpaleosolinLuochuanareaincludingsomeofwoodytypesItshowsthegoodclimateconditionexiste

7、dinlastinterglacialThereisacycleofvegetationchangeintheinterglacialperiodTheforeststeppeCanlivedinsomeperiodwhentheconditionofwaterandheatwereappropriate3Theconclusionfromthebiomezationmethodisdifferentfromqualitativeana