SCIENTIA GEOGRAPHICA SINICA ›› 2007, Vol. 27 ›› Issue (2): 261-267.doi: 10.13249/j.cnki.sgs.2007.02.261

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Heavy Metals Loads in Sediment of Dianchi Lake Based on 137Cs Dating

ZHANG Yan1,2, DENG Xi-Hai2, CHEN Jie2   

  1. 1. Department of Urban and Resources Sciences, Nanjing University, Nanjing, Jiangsu 210093;
    2. Institute of Soil Science, Chinese Academy of Sciences, Nanjing, Jiangsu 210008
  • Received:2005-09-22 Revised:2006-01-12 Online:2007-03-20 Published:2007-03-20

Abstract: According to the shape of Dianchi Lake,the land forms of the lake basin and the sources of sediment and heavy metals,Dianchi Lake was divided into seven zones by using Geographic Information System(GIS).The sediments in the upper part of each zone,which were identified by 137Cs dating at different depths,correlate to special periods,such as 1954-1963,1963-1986,1986-2003.The mean sedimentation flux and annual total amounts of sediment accumulations of seven zones were evaluated.The results agree with the events occurred in Dianchi basin in lately 50 years obtained by different methods.Based on the sedimentation fluxes and the concentrations of heavy metals in the sediments measured in laboratory,the mean sedimentation fluxes and mean annual accumulation amounts of heavy metals,such as Cu,Cr,Cd,Pb,Hg,Zn,of each zone in three periods were calculated.The heavy metals loads from 1963 to 2003 in the sediments of Lake Dianchi were 1 040.8,1 054.0,11.2,824.7,2.5,2 465.6 t,individually.In order to control the increases of heavy metal loads,it is necessary to reduce the amounts of both heavy metals and materials entering Dianchi Lake.

CLC Number: 

  • X524