干旱区生态环境知识资源中心(Arid): 内蒙古鄂尔多斯高原泊江海子全新世气候变化初步研究

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	内蒙古鄂尔多斯高原泊江海子全新世气候变化初步研究
其他题名	A PRELIMINARY STUDY ON HOLOCENE CLIMATE CHANGE OF ORDOS PLATEAU, AS INFERRED BY SEDIMENTARY RECORD FROM BOJIANGHAIZI LAKE OF INNER MONGOLIA,CHINA
	姜雅娟 1; 王维 1; 马玉贞 2; 李岩岩 1; 刘立娜 1; 何江 1
来源期刊	第四纪研究
ISSN	1001-7410
出版年	2014
卷号	34 期号:3 页码:654-665
中文摘要	以10个AMS ~(14)C测年为框架,利用BJH01孔438cm沉积物岩芯的粒度、烧失量以及孢粉阔叶树含量等代用指标,初步重建了泊江海子地区冰消期以来的气候和环境变化:1)11820cal.a B.P.以前,钻孔处为风成环境,流域发育荒漠或草原化荒漠,气候寒冷干燥;2)11820~ 11390cal.a B.P.,湖泊形成,流域植被好转,降水略增加,气候变暖湿;3)11390~7510cal.a B.P.,湖泊维持高湖面,降水增加,区域植被演化为阔叶疏林草原,气候温暖湿润,其中10500 - 8500cal.a B.P.为最宜期;4)7510~6800cal.a B.P.,湖泊水位降低,区域植被退化,气候变干;5)6800~ 1590 cal.a B.P.,气候总体波动变干,其中5000~4000cal.a B.P.为湖侵阶段,气候湿润,4000~ 1590cal.a B.P.为湖退阶段,气候最为干旱;6)1590cal.a B.P.以来湖泊扩张,水位升高至钻孔位置以上,流域植被为典型草原,气候与现在相当。泊江海子重建的全新世气候变化序列与区域乃至更大尺度的气候变化具有相关性,表现出早全新世湿润、中晚全新世变干的趋势,是季风系统通过海气耦合对北半球夏季日辐射增加的快速响应。
英文摘要	High resolution Holocene climate sequences were needed in marginal monsoon area of China for that not only the area were interacted by those climate subsystems including the winter monsoon, the summer monsoon and the westerlies, but also for that controversies were still existed among those published Holocene sequences. This paper presents a high-resolution Holocene vegetation and climate reconstruction from the sediment of Boj ianghaizi Lake (39°46’?39°48’N, 109°17’?109°22’E), a closed lake located in the undulating plateau in the central north area of the Ordos Plateau, Inner Mongolia, China. A 438cm-long core (BJH01,39°47’34. 34"N,109°18’31. 28"E)was drilled from the north central part of the lake and proxies including grain-size,loss on ignition (LOI) and pollen were investigated on 209 samples. The core could be lithologically divided into 5 units : Unit 1 (438 ?412cm, ca. 11820cal.a B.P.) composed by green and gray sand with gravels, Unit 2(412~384cm,11820~ 11390 cal.a B.P.) dominated by gray and green sand,Unit 3 (384?130cm, 11390?7510cal.a B.P.) consisted of black and gray silt,Unit 4 (130 ~ 84cm, 7510 ?6800cal.a B.P.) dominated with gray and green silt and Unit 5 (84 ~ 0cm, 1590cal.a B.P.) of silt. A hiatus at the depth of 84cm could be deduced by the dates above and below. On the basis of 10 valid AMS ~(14)C dates and the proxy’s investigations, Holocene climate sequences and lake evolution were reconstructed. That is, aeolian environment dominated and desert prevailed before 11820 cal.a B.P., as inferred by the aeolian sand deposit and the lowest organic matter content and the lowest total pollen concentration. The lake came into being and the vegetation ameliorated a little since 11820cal.a B.P. as indicated by the fluvial sediment and the small rise of organic matter content and total pollen concentration. High lake level persisted and broadleaf woodland steppe prevailed between 11390cal.a B.P. and 7510cal.a B.P., as inferred by the lacustrine silt deposit, the ca. 10% broadleaf pollen percentages, the peak value of pollen concentration, the increased organic matter content and the high carbonate contents. During 7510~6800cal.a B.P.,the lake regressed and the vegetation deteriorated into steppe or desert steppe under a gradually drying climate, those were reconstructed on the basis of the coarsening of sediment, the decrease of broadleaf pollen percentages, the decrease of organic matter and carbonate contents. The period between 6800cal. a B.P. and 1590cal. a B.P. might be fluctuantly drying with a remarkable humid phase of lake transgression during 5000 ~ 4000cal.a B.P. and a extreme dry phase of 4000 ?1590cal.a B.P.,the former humid phase was reconstructed on the base of the high lake terrace and the latter dry phase was mainly recovered on the sedimentary hiatus. The past 1590cal.a B.P. might evidenced a vegetation and climate amelioration and lake transgression, as inferred by the increase of broadleaf pollen percentages and total pollen concentration,and the fining of sediments. It should be noted that the humidity of past 1590 yrs might be still lower than that of Early Holocene and the period between 5000cal.a B.P. and 4000cal.a B.P. The BJH01 sequence exhibits humid Early Holocene and a drying Middle to Late Holocene. This was in broad consistent with the regional climate sequences in marginal monsoon area. These might be in close relationship to the increase sea surface temperature of west tropic Pacific, both as close responses to the increased north hemisphere summer insolation.
中文关键词	全新世 ; 气候变化 ; 湖泊沉积 ; 泊江海子 ; 鄂尔多斯高原
英文关键词	Holocene climate change lacustrine sediment Boj ianghaizi Lake Chinese Ordos Plateau
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOLOGY
WOS研究方向	Geology
CSCD记录号	CSCD:5143892
来源机构	北京师范大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/231006
作者单位	1.内蒙古大学环境与资源学院, 呼和浩特, 内蒙古 010021, 中国; 2.北京师范大学, 环境演变与自然灾害教育部重点实验室;;地表过程与资源生态国家重点实验室, 北京 100875, 中国
推荐引用方式 GB/T 7714	姜雅娟,王维,马玉贞,等. 内蒙古鄂尔多斯高原泊江海子全新世气候变化初步研究[J]. 北京师范大学,2014,34(3):654-665.
APA	姜雅娟,王维,马玉贞,李岩岩,刘立娜,&何江.(2014).内蒙古鄂尔多斯高原泊江海子全新世气候变化初步研究.第四纪研究,34(3),654-665.
MLA	姜雅娟,et al."内蒙古鄂尔多斯高原泊江海子全新世气候变化初步研究".第四纪研究 34.3(2014):654-665.