Quaternary Pollen Assemblages,Paleoclimate Evolution Sequence and Regional Correlation in Hengsha Island,Shanghai City
In order to understand the evolution history of Quaternary vegetation and climate in Yangtze delta,the study of Core LZK1 from Hengshan Island,Shanghai on sediment lithology and high resolution spore-pollen data suggests that the changes in pollen assemblage in Quaternary have resulted from the joint effect of topography,transgression and,which show a regular pattern of variation,including coniferous and broad-leaved mixed forest-shrub meadow,coniferous and deciduous broad-leaved mixed forest-shrub meadow,coniferous forest-shrub meadow,evergreen and deciduous broad-leaved mixed forest,coniferous and deciduous broad-leaved mixed forest,deciduous broad-leaved forest,coniferous forest,broad-leaved and coniferous mixed forest,coniferous and deciduous broad-leaved mixed forest-shrub meadow,evergreen and deciduous broad-leaved mixed forest-shrub meadow,evergreen and deciduous broad-leaved mixed forest,deciduous broad-leaved and coniferous mixed forest.The climate changes reflected by the sedimentary environment and palynological assemblages of Core LZK1 can be responded to the climatic events such as the Kunlun glaciation,the great interglaciation,the Guxiang glaciation and the last interglaciation.The climate of the last deglaciation period was cool and slightly dry.At the end of the Late Pleistocene,the study area was sensitive to the cold events such as Oldest Dryas,IACP events,and Younger Dryas.When entering the Holocene,the climate warmed up,the humidity increased,and the sea level continued to rise.During this period,there were cold events of-8.2 ka and-4.2 ka,and a brief process of cooling and drought occurred.Influenced by the Little Ice Age in the Late Holocene,the temperature and humidity decreased and the sea water retreated eastward.
万方数据
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