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3Ma以来华北地区植被演化特征及其驱动因素
投稿时间:2019-07-15  修订日期:2020-03-01  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2020069
摘要点击次数: 48
全文下载次数: 42
作者单位E-mail
胡云壮 中国地质调查局天津地质调查中心,中国地质调查局海岸带地质环境重点实验室 huyunzhuang@163.com 
杨吉龙 中国地质调查局天津地质调查中心,中国地质调查局海岸带地质环境重点实验室  
李影 中国地质调查局天津地质调查中心,中国地质调查局海岸带地质环境重点实验室 liying270@163.com 
周新郢 脊椎动物演化与人类起源重点实验室,中国科学院古脊椎动物与古人类研究所  
刘宏伟 中国地质调查局天津地质调查中心,中国地质调查局海岸带地质环境重点实验室  
商志文 中国地质调查局天津地质调查中心,中国地质调查局海岸带地质环境重点实验室  
基金项目:国家自然科学基金项目(批准号41602205,41972196),中国地质调查局地质调查项目(编号1212011120085,DD20189506)
中文摘要:第四纪冰期与间冰期旋回的形成过程,及其陆生植被系统的响应及演化过程是研究地质时期全球变化的重点问题,本文通过对华北地区北部LN1钻孔的121个高质量孢粉数据重建了过去3 Ma以来的区域植被演化过程。研究结果显示,区域植被经历了4个主要发展过程,约3-2 Ma气候相对温暖湿润,主要为以松、桦、栎、胡桃、榆等组成的落叶阔叶林;约2 Ma,区域植被急剧变化,主要表现为针叶林扩张,阔叶林比例的减少,在2-1.2 Ma转变为以松、云杉、桦为主的针阔叶混交林。在中更新世全球气候转型期,区域植被再次发生迅速改变,在约1.2-0.7 Ma转变为稀树的灌丛草原,0.7 Ma以后区域气候进一步干旱化,在最近 0.7 Ma内区域环境转变为典型草原为主的植被景观。区域的植被变化反映了华北平原区近3 Ma以来整体上呈现出干旱化与寒冷化的趋势,其中2.0 Ma,1.2 Ma,0.7 Ma气候事件最为突出。上述结果反映了华北地区植被的演变过程及季风降水的逐渐减少与北极冰盖在近3Ma以来的迅速扩张期同步对应。
中文关键词:第四纪  华北地区  古地磁年代  植被演化  气候变化
 
Characteristics of Vegetation Evolutionand And Its Driving Factors since 3 Ma in North China
Author NameAffiliationE-mail
huyunzhuang Tianjin Center, China Geological Survey, Key Laboratory of Coast Geo-environment, China Geological Survey huyunzhuang@163.com 
yangjilong Tianjin Center, China Geological Survey, Key Laboratory of Coast Geo-environment, China Geological Survey  
liying Tianjin Center, China Geological Survey, Key Laboratory of Coast Geo-environment, China Geological Survey liying270@163.com 
zhouxinying Key Laboratory of Vertebrate Evolution and Human Origins of Chinese Academy of Sciences, Institute of Vertebrate Paleontology and Paleoanthropology  
liuhongwei Tianjin Center, China Geological Survey  
shangzhiwen Tianjin Center, China Geological Survey, Key Laboratory of Coast Geo-environment, China Geological Survey  
Abstract:The formation process of the Quaternary glacial and interglacial cycles, and the response and evolution process of the terrestrial vegetation system are the key issues in the geological period global change research. This paper reconstructs the regional vegetation evolution process since the past 3 Ma by using 121 high-quality pollen data from borehole of LN1 in North China. The study results indicate that the regional vegetation has experienced four major development processes. The climate is relatively warm and humid during the 3-2Ma and the vegetation is deciduous broad-leaved forest, mainly composed of pine, birch, alfalfa, walnut, and alfalfa. The vegetation changes sharply that the proportion of coniferous forest expand of and the broad-leaved forest decrease in the area around 2 Ma. The vegetation changed to coniferous and broad-leaved mixed forest dominated by pine, spruce and birch during 2-1.2 Ma. During the mid-Pleistocene global climate transition period, the regional vegetation changed rapidly, transforming into a shrub land of sap trees at about 1.2-0.7 Ma. After 0.7 Ma, the regional climate was further dry and the regional environment changed to typical grassland vegetation landscape around 0.7Ma. The vegetation changes in the region reflect the trend of aridification and coldness in the North China Plain since the 3Ma and the 2.0 Ma, 1.2Ma, and 0.7Ma climate events are the most prominent. These results reflect that the vegetation evolution process and the gradual decrease of monsoon coincide with the rapid expansion of the Arctic ice sheet since nearly 3 Ma in North China.
keywords:Quaternary  North China  palaeomagnetic age  palaeovegetation evolution  palaeoclimate evolution
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