摘要
利用湖泊钻孔的孢粉及炭屑分析资料,探讨了安徽巢湖湖泊沉积物孢粉—炭屑组合记录的全新世以来植被与气候演变。孢粉—炭屑记录表明:本区9870—6040cal.aBP,植被是以壳斗科的落叶、常绿属种为主的落叶阔叶、常绿阔叶混交林,气候呈现温和略干的特点;6040—4860cal.aBP,植被是以落叶栎类、栗属、青冈属和栲/石栎属为主的落叶阔叶、常绿阔叶混交林,气候由前一阶段的温和略干变为温暖湿润,进入全新世最适宜气候期;4860—2170cal.aBP,植被是以落叶栎类占绝对优势的落叶阔叶、常绿阔叶混交林,气温逐渐降低、湿度下降,气候温和干燥,环境整体向着干旱趋势转化,2170cal.aBP左右出现一次明显的干旱事件;2170—1040cal.aBP,森林退缩,落叶阔叶、常绿阔叶混交林迅速被破坏,演替成以禾本科为主的草地,气候处于转型时期,总体上温和湿润;1040—200cal.aBP,木本植物仅零星分布,可能存在针叶阔叶混交林植被,植被类型逐渐演替成以禾本科、蒿属和蓼属等为主的草丛,其中包括较多的农作物,气候温凉稍湿;200cal.aBP以来,湖区周围零星分布有阔叶乔木,松林在远处可能有分布,植被仍是以禾本科、蒿属和蓼属等为主的草丛,气候相对温暖湿润,但也有若干变凉干的波动,湖泊富营养化水平逐渐增加,人类活动已经对环境变化产生了较大的影响。
Based on the analyses of the pollen-charcoal assemblages of sediments from the borehole in the Chaohu Lake, the vegetation evolution and the climate change in this area since the Holocene have been discussed. The records of the pollen-charcoal assemblages show that the vegetation evolution and climate change in the Chaohu Lake experienced six stages. Namely, the mixed forest of deciduous broad-leaf trees and evergreen broad-leaf trees with Fagaceae being the main components occupied most areas of the Chaohu Lake during 9 870--6 040 cal. a BP, reflecting a relatively warm and slightly dry climate. During 6 040---4 860 cal. a BP, the climate changed from warm and slightly dry in the former stage to warm-moist condition （Atlantic period）, the vegetation changed to the mixed forest of deciduous broadleaf trees and evergreen broad-leaf trees with Quercus, Castanea, Cyclobalanopsis and Castanopsis/Lithocarpus as the main components. During 4 860--2 170 cal. a BP, the records indicate that this area was dominated by the mixed forest of deciduous broad-leaf trees and evergreen broad-leaf trees with Quercus as the main components, which reflects a relatively warm-dry climate. Interpretation of pollen-charcoal assemblages also suggests a drying trend with the decrease in temperature and humidity during this period. An obvious draught event occurred at about 2 170 cal. a BP. During 2 170wl 040 cal. a BP, the vegetation changed from the mixed forest of deciduous broad-leaf trees and evergreen broad-leaf trees to the grassland with Gramineae as the main components. This was a climate transition period which was charac- terized by a relatively warm-wet climate condition. During 1 040--200 cal. a BP, the vegetation was dominated by the mixed forest of conifers and broad-leaf trees-grassland with Pinus, Gramineae being the main components. There were many crops in this stage. The climate was relatively cool and slightly moist in this period. From 200 cal. a BP to the present, grasslands occupied most areas around the lake wi
出处
《古地理学报》
CAS
CSCD
2008年第2期183-192,共10页
Journal of Palaeogeography：Chinese Edition
基金
国家自然科学基金项目(编号:40571162)
国家重点基础发展研究计划(国家973项目)(编号:2003CB415201)
安徽省自然科学基金项目(编号:050450401)资助
关键词
安徽
巢湖
湖泊沉积物
全新世
孢粉—炭屑组合
植被演替
气候变化
Anhui, Chaohu Lake, lacustrine sediments, Holocene, pollen-charcoal assemblages,vegetation evolution, climate change
