抚顺盆地中-晚始新世古植被与古气候

为重建东北地区中-晚始新世古气候，对抚顺盆地孢粉进行传统鉴定，利用有序聚类分析划分孢粉组合，结合共存分析法对孢粉组合定量化以建立研究区的古气候参数值.鉴定出孢粉67属，划分出（Ⅰ）Quercoidites- Tricolpopollenites- Betulaceoipollenites组合；（Ⅱ）Piceapollis-Tiliaepollenites-Chenopodipollis组合；（Ⅲ）Quercoidites-Betulaceoipollenites-Ulmipollenites组合；（Ⅳ）Pinuspollenites-Abietineaepollenites-Ephedripites组合；（Ⅴ）Betulaceoipollenites-Taxodiaceaepollenites-Quercoidites组合，其中组合Ⅰ、Ⅱ、Ⅲ时代为中始新世；组合Ⅳ、Ⅴ时代为晚始新世.植被类型也经历了:落叶阔叶林-草原型植被→针阔叶混交林-草原型植被→落叶阔叶林-草原型植被→针叶林→针阔叶混交林的转变.气候带经历了由亚热带、亚热带-温带湿润性气候向温带半湿润性气候的转变，年均温和年降雨量均呈降低的趋势，这些变化趋势与全球温度变化趋势相耦合. 

Paleovegetation and Paleoclimate during Mid-Late Eocene in Fushun Basin

For rebuilding the paleoclimate during Mid-Late Eocene in Northeast China, it analyzes the palynological characteristics in Fusun basin. Combining coniss analysis with co-existence approach, it quantitatively reconstructs the paleoclimate parameters in research area. 67 genera are identified and divided into 5 assemblages as: (Ⅰ) Quercoidites-Tricolpopollenites-Betulaceoipollenites Assemblage; (Ⅱ) Piceapollis-Tiliaepollenites-Chenopodipollis Assemblage; (Ⅲ) Quercoidites-Betulaceoipollenites-Ulmipollenites Assemblage; (Ⅳ)Pinuspollenites-Abietineaepollenites-Ephedripites Assemblage; (Ⅴ) Betulaceoipollenites-Taxodiaceaepollenites-Quercoidites Assemblage. The age of assemblages Ⅰ, Ⅱ, Ⅲ belongs to Middle Eocene, and the age of assemblages Ⅳ, Ⅴ belongs to Late Eocene. The vegetation types of the basin experienced the transformation as deciduous broadleaf forest-steppe type vegetation→coniferous and broadleaf mixed forest-steppe type vegetation→deciduous broadleaf forest-steppe type vegetation→ coniferous forest→coniferous broadleaf mixed forest. The climatic zone changed from subtropical-temperate to temperate, the humidity changed from humid to semi-humid, and the average annual moderate and annual average rainfall decreased. This trend is coupled with the global temperature trend.