干旱区生态环境知识资源中心(Arid): 腾格里沙漠东缘26ka来环境演化的植硅体记录

Arid

	腾格里沙漠东缘26ka来环境演化的植硅体记录
其他题名	Environmental Change Documented by Pluvial Phytolith Records in the Past 26ka on East Edge of Tengger Desert
	顾延生 1; 刘胡玫 2; 曾佐勋 3; 蔡雄飞 3; 李志勇 3
来源期刊	地球科学
ISSN	1000-2383
出版年	2016
卷号	41 期号:4 页码:605-611
中文摘要	贺兰山中段西侧沙漠戈壁沉积发育,生态环境脆弱,对探讨末次冰期以来气候变化与沉积响应具有重要意义.选择了腾格里沙漠东缘晚更新世晚期以来的洪积物剖面进行了初步古环境研究.在数字填图系统和野外路线调查基础上,对贺兰山中段西侧、腾格里沙漠东缘地貌第四纪沉积物进行了较详细的调查研究.在AMS~(14) C测年基础上,从内蒙古阿拉善高原腰坝地区Qp_3-Qh~(pl)洪积剖面沉积物中获得较丰富的植硅体化石,主要类型有方型、长方型、扇型、哑铃型、齿型、帽型、尖型、平滑棒型、刺边棒型、突起棒型、三棱柱型等.此外,沉积物中赋存的大量炭屑和燃烧植硅体反映了古人类活动的历史.运用植硅体组合和温暖指数分析重建了研究区26ka来的古植被、古气候演化,气候变化自早至晚经历了明显的干凉-暖干-暖湿-冷湿-干冷-暖干-暖湿7个阶段.洪积扇扇缘沉积环境变化反映了气候的干湿变化,且气候干湿变化与区域沙漠化和人类活动具有相关性.
英文摘要	The desert and Gobi deposition are prevailing in the west edge of the middle Helan Mountain,which is subject to the frangibility of eco-environment.It is important to explore the relationship between the climate change and deposition response of Gobi desert since the Last Glacial,apluvial profile of late Late Pleistocene on the east edge of Tengger desert is employed to rebuild the palaeoenvironmental change based on the phytolith analysis.On the basis of regional geological survey,geomorphology pattern and Quaternary sediment distribution in the west of middle Helan Mountain and east edge of Tengger desert were investigated in detail.Based on the AMS~(14) C dating and phytolith records,paleovegetation and paleoclimate changes are reconstructed in detail.Relatively abundant phytolths are found in the pluvial sediments of Qp_3-Qh profile at the Yaoba,including the following morphotypes:parallelepipedal bulliform cells(including square-and rectangle-shaped)and cuneiform bulliform cells(fan-shaped),bilobate,rondel,trapeziform sinuate,elongate and unciform hair cell(point-shaped),elongate smooth, elongate echinate,elongate protuberant,and prism,etc.In addition,there are abundant charcoals and burnt phytoliths in the sediments,indicating the history of ancient human activities.Phytolith assemblages with the warmth index analysis have rebuilt the history of paleovegetation and paleocliamte changes in the past 26 ka,showing 7 evident stages as follows:cool-dry,warm dry,warm-humid,cold-humid,cold-dry,warm-dry,and warm-humid.Our results demonstrate that the sedimentary environment of pluvial fan margin has a good response to the drought and wetness change of climate.The variation of the drought and wetness has a close relation with the regional desertification and ancient human activities.
中文关键词	腾格里沙漠东缘 ; 洪积物 ; 植硅体 ; 环境变化 ; 古气候 ; 环境地质
英文关键词	east edge of Tengger desert pluvial sediment phytolith environment change paleoclimate environmental geology
语种	中文
国家	中国
收录类别	CSCD
WOS类目	MINERALOGY
WOS研究方向	Mineralogy
CSCD记录号	CSCD:5691993
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/234082
作者单位	1.(武汉)中国地质大学, 生物地质与环境地质国家重点实验室;;湿地演化与生态恢复湖北省重点实验室, 武汉, 湖北 430074, 中国; 2.(武汉)中国地质大学环境学院, 武汉, 湖北 430074, 中国; 3.(武汉)中国地质大学地球科学学院, 武汉, 湖北 430074, 中国
推荐引用方式 GB/T 7714	顾延生,刘胡玫,曾佐勋,等. 腾格里沙漠东缘26ka来环境演化的植硅体记录[J],2016,41(4):605-611.
APA	顾延生,刘胡玫,曾佐勋,蔡雄飞,&李志勇.(2016).腾格里沙漠东缘26ka来环境演化的植硅体记录.地球科学,41(4),605-611.
MLA	顾延生,et al."腾格里沙漠东缘26ka来环境演化的植硅体记录".地球科学 41.4(2016):605-611.