淀山湖地区晚第四纪孢粉及古环境研究

通过对淀山湖地区赵巷4井、淀峰1井等晚第四纪地层孢粉研究，划分出6个孢粉组合带，反映本地区植被演替与气候波动的6个阶段．自古至今依次是：第一阶段常绿阔叶、落叶阔叶混交林，反映气候温暖湿润(Q3^3-2)；第二阶段稀疏的针叶、落叶阔叶混交林，反映气候冷而稍湿(Q3^3-3)；第三阶段针叶、落叶阔叶混交林一草原，反映气候温和略湿(Q4^1)；第四阶段以常绿栎类为主的常绿阔叶林，反映气候热暖潮湿(相当于大西洋期，Q4^2)；第五阶段以栎、松、禾本科、水龙骨科为主的针叶、阔叶混交林，反映气候温暖略干(相当于亚北方期，Q4^2后期)；第六阶段以常绿栎类、落叶栎类、松为主的针、阔叶混交林-草原，反映气候温暖湿润(相当于亚大西洋期，Q4^3)．这种气候波动与世界性的气候变化相一致．

Studies on Sporo-pollen and Paleoenvironment of Late Quaternary in Dianshanhu Lake Region

Six palynological assemblages were distinguished through an intensive study on spore and pollen from the cores Z4 and DF1 at Dianshanhu Lake region.Six stages about the evolution of vegetation and climate were reconstructed for the Late Quaternary in this area as follows:mixed forest of evergreen broad-leave trees and deciduous broad-leave trees,reflecting a warm and moist climate(Q 3-2 3);mixed sparse forest of conifers and deciduous broad-leave trees,reflecting a cold and little moist climate(Q 3-3 3); mixed forest of conifers and broad-leave trees-grassland,reflecting temperate and little moist climate(Q 1 4); evergreen broad-leave forest mainly composed of Quercus (evergreen) indicating hot and wet climate(Q 2 4,Atlantic period);mixed forest of conifers and broad-leave trees,indicated by Quercus,Pinus ,Gramineae and Polypodiaceae as main element in palynological assemblages,reflecting warm and little dry climate(Q 2 4,Sub-Boreal period); mixed forest of broad-leave and conifers trees-grassland, Quercus (evergreen), Quercus (deciduous) and Pinus being the main components,reflecting warm and moist climate(Q 3 4,Sub-Atlantic period,). These fluctuations coincide with the global climatic changes.