通过对北海外沙泻湖CK10 钻孔岩芯进行硅藻、有孔虫、孢粉的综合分析, 发现全新世地层中有8 个硅藻组合带,5 个孢粉组合带和5 个有孔虫组合。结合14C测年资料与沉积物特征, 认为该泻湖全新世地层可划分为早全新世、中全新世、晚全新世。植被演替为混有落叶阔叶林的亚热带常绿阔叶林→亚热带常绿林→亚热带、热带常绿阔叶林→混杂有中、北亚热带落叶阔叶林的南亚热带季风雨林→南亚热带常绿阔叶林。气候演变依次为热湿偏凉干→热湿→炎热潮湿→热湿偏凉→热湿。沉积相发展顺序为河漫滩相→河口沼泽相→河漫滩相→河口沼泽相→河口湾相→泻湖相→河口湾相→泻湖相。 Through the comprehensive analysis of diatom, foraminifera and sporopollen in core lagoon CK10 of Beihai, it is found that there are 8 diatom assemblages, 5 sporopollen assemblages and 5 foraminifera in the Holocene strata combination. Combined with the 14C dating data and sedimentary features, it is concluded that the Holocene strata of the lagoon can be divided into Early Holocene, Middle Holocene and Late Holocene. Vegetation succession is subtropical evergreen broad-leaved forest mixed with deciduous broad-leaved forest → subtropical evergreen forest → subtropical and tropical evergreen broad-leaved forest → south subtropical monsoon forest mixed with middle-subtropical deciduous broad-leaved forest → south subtropical Evergreen broad-leaved forest. Climatic evolution followed by hot and humid partial wet and dry → hot and humid → hot and humid → hot and humid cool → hot and humid. The sequence of sedimentary facies is that of floodplain facies → estuary swamp facies → flood plain facies → estuarine swamp facies → estuarine facies → lagoon facies → estuarine facies → lagoon facies.