辽宁南部金州地区距今13.5 ka以来古植被古气候变化  

PALAEO-VEGETATION AND PALAEO-CLIMATE CHANGES SINCE 13.5 cal.ka B.P.IN JINZHOU,SOUTHERN OF LIAONING PROVINCE

作　　者：马瑞丰 张威[1] 金培红 方晶[3] 刘亮[1] 杨蝉玉[1] 柴乐 张俊[1] MA Ruifeng;ZHANG Wei;JIN peihong;FANG Jing;LIU Liang;YANG Chanyu;CHAI Le;ZHANG Jun(School of Geography,Liaoning Normal University,Dalian 116029,Liaoning;Lanzhou Center for Oil and Gas Resources,Northwest,Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730030,Gansu;College of Urban and Environmental Science,Tianjin Normal University,Tianjin 300378;School of Earth Science,East China University of Technology,Nanchang 330013,Jiangxi)

机构地区：[1]辽宁师范大学地理科学学院,辽宁大连116029 [2]中国科学院西北生态资源环境研究院兰州油气资源研究中心,甘肃兰州730030 [3]天津师范大学城市与环境科学学院,天津300387 [4]东华理工大学地球科学学院,江西南昌330013

出　　处：《第四纪研究》2021年第1期43-50,共8页Quaternary Sciences

基　　金：辽宁省特聘教授项目“辽东半岛黄土记录的风沙活动与海平面变化之间的关系”(批准号:60618006);国家自然科学基金项目(批准号:41671005)共同资助。

摘　　要：全新世的穿时性在我国季风区一直备受关注,辽南地区全新世气候变化研究较为缺乏,针对其变化细节的研究很必要。本文基于辽南金州地区一处总厚为354 cm的山间盆地沉积剖面,以220 cm以上的湖沼相沉积的AMS14C年代、岩性、孢粉及硅藻的综合分析,确定该剖面为全新世湖沼-泥炭相淡水沉积。研究表明,西团瓢湖相沉积形成于13500 cal.a B.P.前后,该地区植被主要经历了榆-栎阔叶林到针阔混交林两个演替阶段,基于孢粉记录的气候变化过程经历了新仙女木寒冷干燥期、早-中全新世温暖湿润期、晚全新世从温暖湿润到寒冷干燥过渡期以及现代寒冷干燥期这4个阶段,其中晚全新世1387~1529 cal.a B.P.是该区的泥炭发育的起始期。该研究进一步展示了辽南地区全新世以来的气候变化细节,为研究本区全新世以来环境演变过程提供了重要依据。Holocene climate reconstruction is vital for the prediction of the future climate change,however,there is a long-standing controversy concerning the spatial and temporal pattern of the Holocene Optimum in East Asian monsoon region.Especially in the Northeastern China that typically dominated by East Asian monsoon systems,the Holocene paleoclimate records are still less studied.More work is needed to better understand the climate change,vegetation history during the Holocene in this region.In this study,we present a reconstruction of Holocene climate changes from a lacustrine sedimentary profile(39°14’50.63″N,121°43’21.21″E)in southern Liaoning Province,Northeastern China.The thickness of the profile was 354 cm and sediments above 220 cm were the main research object.A total of 40 samples each weighing200 g were taken for pollen analysis.The climatic and vegetation changes over the past 13500 years were discussed based on the sedimentary facies and high-resolution pollen and diatom analysis with the chronology constrained by AMS14 C dates.The pollen analysis showed that the regional vegetation response to climate changes,dominated from the broad-leaved forest to a mixed broadleaf/conifer forest.The records can be divided into four stages,cold and dry conditions during the Younger Dryas,following by a warm and humid climate in the Early and Middle Holocene;climate transitioned from warm/humid to cold/dry condition during the Late Holocene and the the cold/dry climate in the modern period.From approximately 1387 cal.a B.P.to 1529 cal.a B.P.,the peat development was identified in the profile.This study provides evidences for the climate change in southern Liaoning over the past 13500 years and gain a better understanding of the timing of Holocene Optimum in Northeastern China and the response of the vegetation to the regional climate.

关 键 词：孢粉 辽南地区 全新世 东亚季风 气候重建 植被重建 

分 类 号：P534.632[天文地球—第四纪地质学] P532[天文地球—古生物学与地层学]