黄海末次盛冰期以来古环境的演化——来自孢粉组合的证据

Paleoenvironmental evolution since the Last Glacial Maximum in Yellow Sea:Evidence from sporopollen assemblages

为了在精确的年代框架下重建黄海末次盛冰期以来古植被、古环境的演变,对NHH01孔上部0~7.3m(~0~22.0ka B.P.)岩心样品进行孢粉分析。在65个样品中鉴定出53科81属,根据统计结果中孢粉及碳屑含量变化,划分为9个孢粉组合带,草本植物花粉与针叶、落叶阔叶植物花粉含量此消彼长,反映出气候冷暖、干湿的多次变化,总趋势为气候变暖和海平面上升;识别出3次降温事件,分别在约10.0ka、7.78~7.33ka、4.89ka,新仙女木事件(12.88~11.64ka)对本区影响不显著,表现为湿冷的气候。本次研究对分析不同纬度地区对气候变化的响应提供了新资料。

To reconstruct the paleovegetation and paleoenvironment evolution of the Yellow Sea since the Last Glacial Maximum at a precise chronological framework,65 sporopollen samples at depth 0-7.3 m(-0-22.0 ka B.P.)of the sediment core NHH01 from the South Yellow Sea were analyzed.A total of 81 sporopollen types were identified,which belongs to 53 families and 81 genera.According to the changes of sporopollen and charcoal contents,they were divided into 9 sporopollen assemblages.The pollen content of herbaceous plants and that of conifers and broadleaved trees waned and waxed during the study interval,indicating the multiple climatic changes of temperature and humidity in the local coastal areas.As a result,the general trend of climate warming and sea level rise are seen.Three distinct cooling events were identified,at 10.0 ka,7.78-7.33 ka and 4.89 ka respectively.The New Younger Dryas(12.88-11.64 ka)had no significant effect on this area,resulting in humid and cold climate.This study provides new information for analyzing the response to climate changes at different latitudes.