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现代地质 ›› 2010, Vol. 24 ›› Issue (2): 377-382.

• 环境科学 • 上一篇    下一篇

新疆乌伦古湖的210Pb、137Cs测年与现代沉积速率

金爱春1,蒋庆丰2,3,陈晔1,张广胜4,赵永杰1   

  1. 1. 南京师范大学 地理科学学院,江苏 南京210046;   2.南通大学 地理科学学院,江苏 南通226007;
    3.中国科学院 南京地理与湖泊研究所,江苏 南京210008; 4.南京大学 地理与海洋科学学院,江苏 南京210093
  • 出版日期:2010-04-20 发布日期:2010-05-10
  • 通讯作者: 蒋庆丰,男,副教授,1976年出生,自然地理学专业,主要从事湖泊沉积与环境变化研究。
  • 作者简介:金爱春,男,硕士研究生,1974年出生,自然地理学专业,主要从事海洋地理与环境变化研究。 Email:jacbp@163.com
  • 基金资助:

    国家自然科学基金项目(40802084,40671193);江苏省高校自然科学基金项目(08KJD170006)

210Pb and 137Cs Dating and Modern Sedimentation Rate in the Wulungu Lake, Xinjiang

JIN  Ai-Chun1, JIANG  Qing-Feng2,3, CHEN  Ye1,ZHANG  Guang-Sheng4, ZHAO  Yong-Jie1   

  1. 1.School of Geography,Nanjing Normal University,Nanjing, Jiangsu210046, China;    2. School of Geography Science, Nantong University, Nantong, Jiangsu226007, China;   3.Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, Jiangsu 210008, China;   4. School of Geographical and Oceanographic Sciences, Nanjing University, Nanjing, Jiangsu210093, China
  • Online:2010-04-20 Published:2010-05-10

摘要:

通过对乌伦古湖2个沉积柱样的210Pb和137Cs剖面的观测,运用210Pb过剩法和137Cs时标法估算了近几十年来的平均沉积速率。研究结果表明:210Pb过剩法的CRS模式测定的沉积速率的变化范围为0.018~0.071 g/(cm2·a),137Cs时标法测定沉积速率的变化范围为0.034~0060 g/(cm2·a),两者具有较高的一致性。20世纪60年代以前,人类活动对本区影响相对较小,湖泊的沉积速率主要受自然因素的影响;20世纪60年代以后,随着乌伦古河中、下游农业的发展和调水工程的实现,人类活动逐渐成为主导湖泊演化的因素,从而影响乌伦古湖沉积速率。

关键词: 乌伦古湖, 210Pb, 137Cs, 现代沉积速率, 人类活动

Abstract:

Using 210Pb and 137Cs dating methods, based on observation on profiles of two sediment core samples,the average deposition rate of the Wulungu lake in recent decades is determinated.  Sedimentation rates of  210Pb (CRS model) determination range from 0.018 to 0.071 g/(cm2·a) and sedimentation rates  of  137Cs determination  range from 0.034 to 0.060 g/(cm2·a). The results showed a relatively good agreement with each other. It is indicated that natural factors have much more influence than human activities on the sedimentation rate of Wulungu lake before 1960s. With the development of agriculture and implementation of water transfer project at the middle and lower reaches of Wulungu River, human activities gradually become the dominant factor in the evolution of lakes, thus affecting the sedimentation rate of Wulungu lake after 1960s.

Key words: Wulungu lake, 210Pb, 137Cs, modern sedimentation rate, human activity

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