中文摘要：

通过对南海69站深海柱状剖面的孢粉、藻类研究，根据孢粉成分的变化将该孔沉积层从下至上划分为5个孢粉组合带：1带：Quercus（常绿）-Pinus-Cyathea-Artemisia孢粉带（552．5—470cm）；2带：Pinus-PP0dofnrpus—Quercus—Polypodiaceae孢粉带（470--350cm）；3带：Quercus（常绿）-Castanopsis—Pinus—Polypodiaceae孢粉带（350250cm）；4带：Pinus，Podocarpus-Artemisia-Polypodiaceae孢粉带（250140cm）；5带：P0docarpus-cyathea-Quercus（常绿）-Pinus-Polypodiaceae孢粉带（140-0cm）。并相应恢复了南海东部64000a以来3个植被、气候、古环境演替阶段：热带季雨林、热带北缘半常绿季雨林和热带季雨林。结合氧同位素测定资料，对69站柱状地层时代作了划分：孢粉1带相当于氧同位素3期，时代为Q3^3-2；孢粉2-4带相当于氧同位素2期，时代为Q3^3-3；孢粉5带为氧同位素1期，时代为Q4.

英文摘要：

During the sporopollen and algae research of the deep-sea sediments at Core 69 in the South China Sea, five sporopollen zones have been distinguished in ascending order as Zone 1 （552.5--470 cm） ： Quercus （evergreen）-Pinus-Cyathea-Artemisia, Zone 2 （470--350 cm） ： Pinus-Podocarpus-Quercus-Pol- ypodiaceae, Zone 3 （350--250 cm） ： Quercus （evergreen） Castanopsis-Pinus-Polypodiaceae, Zone 4 （250 140cm） ： Pinus-Podocarpus-Artemisia-Polypodiaceae, and Zone 5 （140--0 cm） ： Podocarpus-Cyathea Quercus （evergreen） Pinus-Polypodiaceae. The sporopollen zones reflect three evolution stages of vegetation, climate and paleoenviornment in the South China Sea since 64 000 yr BP as follows： hot and wet tropical monsoon rainforest, semievergreen monsoon rainforest of northern tropics, and return to hot and wet tropical monsoon rainforest. Stage 1. During this period, the vegetation was characterized by tropical monsoon rainforest, reflecting a hot and wet climate when the sea level rose. There were many evergreen tree species. The tree layer was dominated by Dacrydium, Podocarpus, evergreen Quercus, Pinus, Elaeocarpus, Magnolia, Castan- opsis, Palmae, Myrica and Altingia, among others. The herbage layer under canopy included Gramineae, Artemisia, Chenopodiaceae and Cyperaceae. The ferns were dominated by Polypodiaceae, Microlepia, Cyathea, Diplopterygium and Pteris. Mangrove plants grew along the coastal areas. Stage 2 ： The vegetation was semievergreen monsoon rain{orest of northern tropics. This stage was indicated by the palynological Zones 2 to 4. The elements of evergreen Quercus, Castanopsis, Pinus and Magnolia from the southern subtropical zone increased in the vegetation, whereas the elements of Elaeo- carpus, Dacrydium and Palmae from the tropical zone decreased. The herbage layer under canopy consis- ted of Gramineae, Artemisia and Cyperaceae, among others. The ferns were dominated by Polypodiaceae, Pteridium, Cyathea, Diplopterygium and Adiantum. Mangrove plants grew alon