地理科学 ›› 2002, Vol. 22 ›› Issue (1): 39-42.doi: 10.13249/j.cnki.sgs.2002.01.39

• 论文 • 上一篇    下一篇

近150a来南红山湖的地球化学特征及环境意义

陈玲1,2, 朱立平2, 张青松2   

  1. 1. 中国科学院地理科学与资源研究所, 北京, 100101;
    2. 北京师范大学环境演变与自然灾害教育部重点实验室, 北京, 100875
  • 收稿日期:2000-07-29 修回日期:2000-10-10 出版日期:2002-01-20 发布日期:2002-01-20
  • 基金资助:
    国家重点基础研究规划项目(G199804080)、中科院重大与特别支持项目(KZ951-A1-204、KZ95T-06)及中科院地理科学与资源研究所创新项目(CXIOG-A01-002)资助.

The Significance of Lake Sediments Geochemistry in Environmental Reconstruction of South Hongshan Lake, Northwestern Tibetan Plateau During the Past 150 Years

CHEN Ling1,2, ZHU Li-ping2, ZHANG Qing-song2   

  1. 1. Institute of Geographic Sciences and Natural Resources Research, the Chinese Academy of Sciences, Beijing 100101;
    2. Key Laboratory of Environmental Change and National Disaster, Ministry of Education of China, Beijing Normal University, Beijing 100875
  • Received:2000-07-29 Revised:2000-10-10 Online:2002-01-20 Published:2002-01-20

摘要: 通过对西昆仑山南红山湖的沉积地球化学特征的分析,恢复了南红山湖区近150a来的环境变化.19世纪50年代初~19世纪80年代中期,气候受小冰期末次波动的影响,以冷湿为特点.19世纪80年代中期~1997年,处于小冰期后回暖期,以暖干趋势为主.其中19世纪80年代中期~20世纪20年代初,以暖干为特点;20世纪20年代初~20世纪中叶,气候较干燥,而且温度与湿度的结合较复杂,属于冷干-暖湿交替的气候类型;20世纪中叶~1997年,气候总特征以暖干为主,尤其是1990年以后,温度升高趋势明显,气候干燥.从近150a湖泊变化的整体趋势看,随着时间的推移,南红山湖在逐渐萎缩.就湖区的气候变化与西昆仑山古里雅冰芯所恢复的气温、降水变化及与较近的两个站点的气象记录进行了对比,认为该地区与古里雅冰芯地区受相同的气候系统控制;高原上区域间存在气候差异;应开展多尺度、高分辨率的多种代用资料的研究.

Abstract: A 107-cm piston core (SHC-2) was drilled with water depth of 5m in South Hongshan Lake, northwest Tibet in 1998. Based upon the 0.72cm/a of modern sedimentary rate that was tested by 210Pb method and also calibrated by 137Cs method as well as the 1cm interval sample cutting level, a lake sedimentary record with 150 yrs long and 1.4 yrs resolution was obtained. The values of TOC, TN, C/N, CaCO3, Sr/Ba and Fe/Mn had clear environmental significance and well reflected the environmental changes. Geochemical multi proxies of lacustrine sediments showed that the environmental changes during the past 150 years could be reconstructed as follows: Stage 1 (1850s-1880s) is a cold wet period, because it is affected by the climatic variation after the Little Ice Age. Stage 2 (1880s-) is a warm dry period. But the period from 1920s to 1950s is warm wet and cold dry type. After the 1990 the warming tendency is marked in the curve of TOC and TN. In the view of general trend in the past 150 years, South Hongshan Lake was shrinking gradually.

中图分类号: 

  • X142/X144