光释光测年和孢粉分析揭示的晚冰期以来科尔沁沙地演化过程

doi:10.13249/j.cnki.sgs.2011.06.695

地理科学 ›› 2011, Vol. 31 ›› Issue (6): 695-701.doi: 10.13249/j.cnki.sgs.2011.06.695

光释光测年和孢粉分析揭示的晚冰期以来科尔沁沙地演化过程

杨林海¹, 赖忠平², 周杰³, 隆浩^2,4, 张静然^2,4

1. 中国科学院寒区旱区环境与工程研究所沙漠与沙漠化重点实验室, 甘肃兰州 730000;
2. 中国科学院青海盐湖研究所盐湖资源与化学重点实验室, 青海西宁 810008;
3. 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, 陕西西安 710075;
4. 中国科学院研究生院, 北京 100049

收稿日期:2010-10-15 修回日期:2010-12-08 出版日期:2011-06-20 发布日期:2011-06-20
基金资助:
中国科学院"百人计划"项目、国家自然科学基金项目(40971162)资助。

Dune Evolution in Horqin Dunefield of China Since Late Glacical Period Inferred from Luminescence Dating and Pollen

YANG Lin-hai¹, LAI Zhong-ping², ZHOU Jie³, LONG Hao^2,4, ZHANG Jing-ran^2,4

1. Key Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;
2. Key Laboratory of Salt Lake Resources and Chemistry, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, Qinghai 810008, China;
3. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an, Shaanxi 710075, China;
4. Graduate University of Chinese Academy of Sciences, Beijing 100049, China

Received:2010-10-15 Revised:2010-12-08 Online:2011-06-20 Published:2011-06-20

摘要/Abstract

摘要： 利用光释光测年技术对科尔沁沙地的7个风成砂-砂质古土壤剖面进行年代测试,结合地层和孢粉分析得到晚冰期以来科尔沁沙地的演化过程如下:16~10 ka B.P.,风成砂出现,沙地活化;10~3 ka B.P.,砂质古土壤发育,沙地固定;约3 ka B.P.前后,风成砂出现,沙地活化;3 ka B.P.至今,多层弱发育砂质古土壤和风成砂的交替出现,指示晚全新世科尔沁沙地的多次固定与活化;从约4~2 ka B.P.,沙地环境由草甸草原逐渐退化为典型草原。分析表明,3 ka B.P.以前科尔沁沙地的演化完全受气候变化的控制,之后(尤其是辽代以后)人类活动的影响日益增强。

Abstract: The Horqin dunefield is located in the northern frontier of East Asian Monsoon (EAM) zone, and its activation and stabilization is sensitive to the ebb and flow of the EAM. However, the activity of dunes in the Horqin dunefield is still poorly understood due to the limited numerical dating. The purpose of the present study is to explore the dune evolution using luminescence dating and pollen analysis in order to understand the relative role of climate and human activity. In the present study, 21 samples collected from seven sections in the Horqin dunefield were dated using quartz optically stimulated luminescence (OSL) dating method. Combined with the stratigraphy, pollen materials and the OSL chronology, the dune avolution in the Horqin dunefield since the late glacial period can be summarized that before 16-10 ka B.P., aeolian sand dunes were mobilized; during 10-3 ka B.P., dunes were stabilized, with dark sandy soil development; at around 3 ka B.P., dunes were mobilized again abruptly; since 3 ka B.P., there were multiple phases of dune stabilization/mobilization. Between 4 and 2 ka B.P., the vegetation of Horqin dunefield degenerated gradually from the meadow steppe to steppe. Dune activity was dominated by climate before 3 ka B.P. However, since 3 ka B.P., both climate variability and human impact have influenced dune evolution in the Horqin dunefield.

中图分类号:

P531

杨林海, 赖忠平, 周杰, 隆浩, 张静然. 光释光测年和孢粉分析揭示的晚冰期以来科尔沁沙地演化过程[J]. 地理科学, 2011, 31(6): 695-701.

YANG Lin-hai, LAI Zhong-ping, ZHOU Jie, LONG Hao, ZHANG Jing-ran. Dune Evolution in Horqin Dunefield of China Since Late Glacical Period Inferred from Luminescence Dating and Pollen[J]. SCIENTIA GEOGRAPHICA SINICA, 2011, 31(6): 695-701.

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光释光测年和孢粉分析揭示的晚冰期以来科尔沁沙地演化过程

Dune Evolution in Horqin Dunefield of China Since Late Glacical Period Inferred from Luminescence Dating and Pollen

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