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引用本文:张欣佳,孙惠玲,吴铎,张晓楠,周爱锋.6200年来六盘山天池磁学特征及环境重建.湖泊科学,2013,25(5):756-764. DOI:10.18307/2013.0519
ZHANG Xinjia,SUN Huiling,WU Duo,ZHANG Xiaonan,ZHOU Aifeng.Magnetic characteristics and palaeoenvironment reconstructions over the past 6200 years of Lake Tianchi of Liupan Mountain. J. Lake Sci.2013,25(5):756-764. DOI:10.18307/2013.0519
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6200年来六盘山天池磁学特征及环境重建
张欣佳1, 孙惠玲2, 吴铎1, 张晓楠1, 周爱锋1
1.兰州大学西部环境与气候变化研究院, 兰州 730000;2.云南师范大学旅游与地理科学学院, 昆明 650500
摘要:
本文对六盘山天池长11 m的GSA孔湖泊沉积岩芯样品进行了磁化率、非磁滞剩磁、等温剩磁测试.结果表明GSA孔岩芯磁性矿物主要是亚铁磁性及反铁磁性矿物.六盘山天池湖泊沉积物的磁性参数变化主要受控于两种模式:整体而言,高(低)粉尘输入指示了夏季风弱(强),成壤作用强(弱)指示夏季风强(弱).质量磁化率χ等参数清晰地记录了6200年来六盘山天池地区的气候变化历史,可分为6200 1300 cal a B.P.及1300 cal a B.P.至今两个阶段.6200年来的六盘山天池湖泊沉积物磁学数据在千年时间尺度上基本与东部季风区变化趋势相似.但是在百年时间尺度上有着较大的差异,这是由于六盘山天池地区的气候变化不仅仅受控于夏季风,同时还受到人类活动导致的黄土高原植被覆盖变化、冬季风变化等因素的影响.
关键词:  气候变化  六盘山天池  磁学参数  夏季风  黄土高原植被覆盖
DOI:10.18307/2013.0519
分类号:
基金项目:国家重点基础研究发展计划"973"项目(2010CB950202,2012CB956102);国家自然科学基金重点项目(41130102,41271221,41201203)联合资助
Magnetic characteristics and palaeoenvironment reconstructions over the past 6200 years of Lake Tianchi of Liupan Mountain
ZHANG Xinjia1, SUN Huiling2, WU Duo1, ZHANG Xiaonan1, ZHOU Aifeng1
1.Research School of Arid Environment and Climate Change, Lanzhou University, Lanzhou 730000, P. R. China;2.College of Tourism and Geography, Yunnan Normal University, Yunnan 650500, P. R. China
Abstract:
In this paper we studied the core GSA (11 m) which was taken from Lake Tianchi of Liupan Mountain in the areas of magnetic susceptibility,anhysteretic remanent magnetisation,and isothermal remnant magnetization.The results show there are two kinds of magnetic minerals in the GSA: ferromagnetic and anti-ferromagnetism.The changes of sedimentary magnetic characteristics of Lake Tianchi are dominated by two patterns: high (low) dust input showing weak (strong) summer monsoon,and strong (weak) soil development showing strong (weak) summer monsoon.Magnetic susceptibility χ,which has recorded the climate change history of study area,can be divided into two parts: from 6200 to 1300 cal a B.P.,from 1300 cal a B.P.to present.The climate changes in the past 6200 years in the study area were similar to that in the monsoon area in millennial time scales,but much different in century time scales.The reasons could be that the climate of study area was not only controlled by summer monsoon,but also by other factors,such as winter monsoon and human activities which lead to the changes in vegetation of the Loess Plateau.
Key words:  Climate change  Lake Tianchi of Liupan Mountain  magnetic parameter  summer monsoon  vegetation of Loess Plateau
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