Sporopollen record during Mid-Late Pleistocene from West Ujimqin Banner,Inner Mongolia,and its paleoclimatic significance
In order to reconstruct the paleoclimate and explore its evolution model and response to the global paleoclimate during the Mid-Late Pleistocene in the Bayinhua Basin,West Ujimqin Banner,Inner Mongolia,the sporopollen of ZK03 and ZK04 in the basin were systematically identified.Combining Coniss analyze with Co-existence Approach,we quantitatively reconstruct the palaeoclimate parameters in research area.68 genera are identified and divided into 3 assemblages as:(Ⅰ)Pinus-Betula-Typha assemblage;(Ⅱ)Quercus-Ephedra-Artemisia assemblage;(Ⅲ)Cyperaceae-Typha-Polypodiaceae assemblage.The age of assemblage Ⅰand assemblage Ⅱwas Middle Pleistocene,while the age of assemblage Ⅲwas Late Pleistocene.The vegetation types experienced the transformation as broadleaved-steppe type with a small amount of coniferous forest vegetation→broadleaved-steppe type vegetation→savanna-steppe vegetation.Palaeoclimate experienced three periods of transition from relatively warm and humid climate to relatively warm and cool semi-arid climate and then to relatively warm and humid climate.The annual average temperature and annual rainfall corresponding to each period also showed a numerical process of change from high to low and then to high.The trend from cool to warm at the turn of the Middle Pleistocene/Late Pleistocene can be well coupled with the trend of global mean temperature that indicated by the oxygen isotopes of Greenland ice core.
West Ujimqin BannerPleistocenesporopollen assemblagespaleoclimategeological survey engineeringCo-existence Approach
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