Acta Geographica Sinica ›› 2011, Vol. 66 ›› Issue (11): 1551-1561.doi: 10.11821/xb201111011

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Modern Sedimentation Rates of Fuxian Lake by 210Pb and 137Cs Dating

WANG Xiaolei1,2, YANG Hao1, DING Zhaoyun1,3, YANG Benjun1,4, ZHANG Mingli1   

  1. 1. School of Geography Science, Nanjing Normal University, Nanjing 210046, China;
    2. Collegel of Biochemical and Environmental Engineering, Nanjing Xiaozhuang University, Nanjing 211171, China;
    3. College of Tourism, Resources and Environment, Zaozhuang University, Zaozhuang 277160, Shandong, China;
    4. College of Resource Environment and Tourist Management, Western Anhui University, Lu'an 237012, Anhui, China
  • Received:2011-07-05 Revised:2011-08-22 Online:2011-11-20 Published:2011-11-20
  • Supported by:

    National Natural Science Foundation ofChina, No.40873071; No. 41030751; National Science Foundation of the Jiangsu Higher Education Institutions ofChina, No.09KJA170002; Scientific Research Foundation of Outstanding Doctoral of Nanjing Normal University,No.1243211601039

Abstract: Based on GPS location, seven sediment cores were collected from different areas of Fuxian Lake. By analyzing the radionuclide profiles of 210Pb and 137Cs, we found that there were three obvious time markers of 137Cs in all the sediment cores, which corresponded to the onset of fallout in 1954, the maximum peak fallout in 1963 and the former Soviet Union's Chernobyl accident in 1986. Some sediment cores (FX1, FX3, FX5 and FX7) had the secondary peaks in 1975 or 1976 by the Chinese nuclear tests, verifying the rationality of this auxiliary time marker. On the basis of the 210Pb (CRS) dating, the ages were obtained in the past 150 years. As for dissimilar physical and chemical associations, diffusion characteristics for the two radionuclides (Pb and Cs), we interpreted the rationality of deviation by the two dating methods. In combination of the 210Pb and 137Cs dating results and historical data, we found that the modern sedimentation rates in different sediment cores (except FX6) of Fuxian Lake had a similar tendency, which can be marked off three stages: natural evolution stage, man-made disturbances stage and man-made transformation stage. In the short time-scale, human activities of historical periods had played a very important role in changing the sedimentation environment of the Fuxian Lake.

Key words: 210Pb dating, 137Cs dating, Fuxian Lake, sedimentation rate, human activities