厦门港湾柱样沉积物的孢粉组合特征

Sporo-pollen assemblage characteristics of core sediments in Xiamen Harbour

本文根据厦门港湾12个柱样沉积物的抱粉分析结果，划分出三个饱粉带，探讨了其沉积环境与古气候演化史。Ⅲ榛属－藜科－水龙骨科带，以榛和草本为主，表明为稀树草原植被和温凉干燥气候，陆相沉积，形成于晚更新世晚期至早全新世；Ⅱ栎属、栲属、栗属一水龙骨科带，表明为繁盛的常绿阔叶林和茂密的灌木草本植被，气候最湿润暖热，为冰后期海面最高时期，海相沉积，形成于中全新世；I松属－禾本科－蕨属、水龙骨科带，由成类、草本和针叶树组成，表明主要为针叶树和栽培植被，气候转为暖干，现代沉积，即晚全新世。

Based on the palynological study of 12 bottom cores from the Xiamen Harbour, threesporo-pollen zones are distinguished and the evolutional history of depositional environmentand paleoclimate in this region are discussed.Ⅲ Corylus-Chenopodiaceae-Polypodiaceae zone, mainly composed of birch and herbs,shows that the vegetation was sparse trees and steppe and the climate was warm-cold anddry. The sediments are terrigeneous, formed in the later stage of the Late Pleistocene to theEarly Holocene.Ⅱ Quercus, Castanopsis, Castanea-Polypodiaceae zone shows that the evergreenbroadleaved forest was much flourishing and shrubs and herbs were quite luxuriant. Theclimate was the wettest and hottest and the sealevel was the highest in the Postglacial Period.The sediments are submarine, formed in the Middle Holocene.Ⅰ Pinus-Gramineae-Pteridium, Polypodiaceae zone, consisting of ferns, herbs andconifers, shows that the vegetation was mainly coniferous trees and cultivated plants and theclimate turned dry and warm. The sediments were formed at the recent time, namely theLate Holocene.