CHANGES IN VEGETATION AND CLIMATE IN THE TAIHULAKE BASIN DURING THE LAST 11 000 YEARS
Xu Xue-mini;William Y.B.Changand Liu Jin-ling(Department of Geology and Anthropology,Louisiana State University, Baton Rogue, LA 70803-41 05,U.S.A.)(Center for Great Lakes and Aquatic Sciences and School of Natural Resources and Environment,the University
This study uses three sediment profiles collected from Taihu Lake to determine the relationship between vegetation cover and climate in the lake basin. Three major periods canbe defined using the pollen assemblages from the sediment profiles.(1)From11 000-9 000 aB.P.,broad leaf deciduous species especially Fagaceae predominate,whileconifer species mainly Pinus had a strong presence.The Taihu Lake Basin was alreadydominated by subtropical evengreen broad leaf deciduous species 1 but the presence of Ablesand Picea indicate that the temperatures were lower than the present ones.(2From9 000-5 000(5 400)aB.P.was the peak period for evergreen broad leaf plant species.The climate was warm and wet, providing a suitable environment for these species. Thetemperature is about I-2 C higher than the present ones.(3)From 5 000 aB.P.present,subtropical broad leaf woody plants, subtropical elements in particular, declined andconifer species and warm-temperate species increased. This reflects lower temperaturesand the increasing impacts of human activities.This article includes the following sections:(1)introduction,(2)materials and methods,(3)results of pollen analyses,(4)interpretation of the sudden in increases in Pinus,Cardamine,and MI'crolepia.
【CateGory Index】： Q911