RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2006, Vol. 15 >> Issue (5): 569-573.

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SEDIMENTATION RATES IN HONGHU, CHAOHU AND TAIHU LAKES IN THE MIDDLE AND LOWER REACHES OF THE YANGTZE RIVER

YAO Shu-chun, XUE Bin, LI Shi-jie, LIU Ji-feng, XIA Wei-lan   

  • Received:2005-09-30 Revised:2005-10-30 Online:2006-09-20
  • Contact: YAO Shu-chun

Abstract: Three lakes, i.e. Honghu, Chaohu and Taihu Lakes in the middle and lower reaches of Yangtze River were selected for understanding the change of sedimentation rates. Environmental 210Pb (natural) and 137Cs (anthropogenic) dating techniques were used. The relationship between exponential 210Pb and depth is nonlinear in Honghu Lake core. Based on 137Cs dating markers, the sediment rate from 1963 to 1986 was the greatest, and it decreased from 1986 to 2002, which was attributed to human activities such as the reclaiming. The chronologies calculated by 210Pb CIC method were consistent with 137Cs dating markers in Chaohu Lake core. It is concluded that since 1970's the flux of deposit increased with the decrease of depth for Chaohu Lake due to the increase of soil erosion. In Taihu Lake core, the average sedimentation rate was 0.34 cm/a calculated by 137Cs markers, while the value 0.41 cm/a was obtained based on 210Pb CIC method. The 210Pb chronologies were corrected using the 1963 137Cs marker in Tauihu Lake core. The results show that sedimentation flux rates are very high, reaching to 0.6 g·cm-2·a-1 near 1990's in Taihu Lake. The combination of these radionuclide dating methods is useful to understand the sedimentation process of the lakes where sedimentation rates have changed.

Key words: 210Pb, 137Cs, sedimentation rates, Honghu Lake, Chaohu Lake, Taihu Lake

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