干旱区生态环境知识资源中心(Arid): 晚第四纪科尔沁沙地干湿变化的黄土记录

Arid

	晚第四纪科尔沁沙地干湿变化的黄土记录
其他题名	The Wet-dry Variations of The Horqin Sandy Field Recorded by Loess Deposit of The Late Quaternare
	弋双文 1; 鹿化煜 1; 周亚利 1; 苗晓东 2
ISSN	1000-694X
出版年	2006
卷号	26 期号:6 页码:869-874
中文摘要	利用光释光(OSL)定年技术对科尔沁沙地南缘的典型黄土剖面进行了测年,结合两个剖面的磁化率、粒度、有机质含量等气候替代性指标,对沙地古气候及环境变化过程进行了分析.结果表明,晚第四纪科尔沁沙地的古气候经历了万年-千年时间尺度的多次干湿变化,特别是在146.96 ka BP前后、141.98 ka BP左右和107.06 ka BP前后发生过重大转变;相应地,沙地地表植被也经历了干冷多风条件下的干草原、荒漠草原和温暖湿润或温凉稍湿气候条件下的森林草原、疏林草原的多次变化.科尔沁沙地古气候的干湿变化可能是晚第四纪东亚冬、夏季风强弱变化的反映.
英文摘要	Horqin sandy land, located at the transitional region between the Northeastern plain and the Mongolia Plateau, is sensitive to climate changes. In this paper, Optical stimulated luminescence dating (OSL) has been used to obtain ages of the typical profile. Combining with the sedimentary facieses, magnetic susceptibility, organic content and grain size, which can be employed as proxy indicators of the paleoclimate and paleoenvironment changes, it is suggested that climate of the sandy land has been changed with dry and wet at 10~3～10~4 time scale, especially at approximately 146.96 ka BP, 141.98 ka BP and 107.06 ka BP, the paleoclimate and paleoenvironment have significantly shifted. Accordingly, the vegetation in this area has undergone a succession of dry-cold grassland, desert grassland and warm-moist or milder-humid forest grassland, sparse grassland. The changes of the climate in Horqin sandy land are consistent with variations of the East Asian monsoon during late Quaternary.
中文关键词	光释光测年 ; 晚第四纪 ; 科尔沁沙地 ; 干湿变化
英文关键词	OSL dating the late Quaternary Horqin sandy land, wet-dry variations
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:2635313
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/220492
作者单位	1.中国科学院地球环境研究所, 黄土与第四纪地质国家重点实验室, 西安, 陕西 710075, 中国; 2.University of Wisconsin Madison, USA
推荐引用方式 GB/T 7714	弋双文,鹿化煜,周亚利,等. 晚第四纪科尔沁沙地干湿变化的黄土记录[J],2006,26(6):869-874.
APA	弋双文,鹿化煜,周亚利,&苗晓东.(2006).晚第四纪科尔沁沙地干湿变化的黄土记录.,26(6),869-874.
MLA	弋双文,et al."晚第四纪科尔沁沙地干湿变化的黄土记录".26.6(2006):869-874.