地理科学

地理科学 ›› 2008, Vol. 28 ›› Issue (4): 548-553.doi: 10.13249/j.cnki.sgs.2008.04.548

• 论文 • 上一篇    下一篇

安徽巢湖全新世湖泊沉积物磁化率与粒度组合的变化特征及其环境意义

王心源1,2,3, 吴立1,3, 张广胜4, 王官勇1,3, 韩伟光1,3   

  1. 1. 安徽师范大学地理系, 安徽 芜湖 241000;
    2. 安徽遥感考古工作站, 安徽 芜湖 241000;
    3. 安徽师范 大学科技考古中心, 安徽 芜湖 241000;
    4. 南京大学地理与海洋科学系, 江苏 南京 231009
  • 收稿日期:2007-10-15 修回日期:2008-02-16 出版日期:2008-07-20 发布日期:2008-07-20
  • 作者简介:王心源(1964- ),男,安徽六安人,博士,教授,主要从事自然地理学等方面的教学与研究。E-mail:xinyuanw57@vip.sina.com
  • 基金资助:
    国家自然科学基金项目(批准号:40571162)、国家重点基础发展研究计划 (国家973项目,课题编号:2003CB415201)和安徽省自然科学基金项目(批准号:050450401)资助。

Characteristics and Environmental Significance of Magnetic Susceptibility and Grain Size of Lake Sediments since Holocene in Chaohu Lake, Anhui Province

WANG Xin-Yuan1,2,3, WU Li1,3, ZHANG Guang-Sheng4, WANG Guan-Yong1,3, HAN Wei-Guang1,3   

  1. 1. College of Land Resources and Tourism, Anhui Normal University, Wuhu, Anhui 241000;
    2. Work Station for Remote Sensing Archaeology, Anhui Normal University, Wuhu, Anhui 241000;
    3. Science and Technology Archaeology Center, Anhui Normal University, Wuhu, Anhui 241000;
    4. College of Geography and Ocean Sciences, Nanjing University; Nanjing, Jiangsu 210013
  • Received:2007-10-15 Revised:2008-02-16 Online:2008-07-20 Published:2008-07-20

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被引次数

257

摘要： 通过对获取的巢湖湖泊沉积岩芯的磁化率与粒度组合特征的分析,结合孢粉及相邻其它区域的环境考古资料,得出该岩芯柱样所反映的环境变化信息。结果表明:(1)巢湖湖泊沉积物磁化率曲线在117 cm以下总体上比较平稳而略有下降,117 cm以上人类活动所导致的侵蚀作用加剧使得磁化率值异常升高;(2)本岩芯柱样117 cm以下样品的磁化率强度与粘土的百分比含量呈正相关,而与粉砂组分的百分比含量成负相关;(3)根据磁化率与粒度组合变化特征,结合孢粉分析及全新世以来区域气候变化背景,9 870 Cal a B.P.以来的巢湖流域古气候环境演变可以划分6个不同的时期:9 870~7 000 Cal a B.P.,气候呈温和略干的特点;7 000~4 750 Cal a B.P.,气候温暖湿润;4 750~2 170 Cal a B.P.,流域气候温和干燥,巢湖湖盆局部地区可能出露水面以上;2 170~1 040 Cal a B.P.,气候总体上温和湿润,但是冷暖波动明显;1 040~2 00 Cal a B.P.流域处在温凉稍湿的时期,人类活动逐渐加强;200 Cal a B.P.至今,流域总体上处于相对温暖湿润阶段。

Abstract: A typical lake sediment core from Chaohu Lake was chosen for this study. The vertical distribution of magnetic susceptibility and grain size in the sediments was determined. Based on the analyses of magnetic susceptibility and grain size of the core samples from Chaohu Lake, the paper has probed into the characteristics and environmental significance of magnetic susceptibility and grain size. The results show that from 490 cm to 117 cm, the curves of magnetic susceptibility are stable on the whole, which dropped slightly; from 117cm to top, the increased human activity makes magnetic susceptibility increasing obviously. The magnetic susceptibility is positive proportional to the contents of fine sand, and reversal proportional to the contents of coarse sand and organic materials. By means of magnetic susceptibility and grain size analyses, combined with pollen and the background of global climate change, regional palaeoclimatic changes were divided into six periods since 9870 cal yr B.P.: (1) mild and moderately dry period of 9870-7000 cal yr B.P.; (2) warm and humid period of 7000-4745 cal yr B.P.; (3) warm and dry period of 4745-2170 cal yr B.P.; (4) mild and humid period of 2170-1040 cal yr B.P., and during which climate fluctuated acutely; (5) cool and moderately humid period of 1040-200 cal yr B.P., climate fluctuate gently; (6) mild and humid period of 200 cal yr B.P. to nowadays.

中图分类号: 

  • X141