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Volume 40 Issue 5
Oct.  2021
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Article Navigation >  CARSOLOGICA SINICA  > 2021  >  40(5): 860-867
TANG Wei,LAN Gaoyong,YIN Jianjun,et al.Distribution and migration of 210Pb and 226Ra in soil in of peak-cluster hillside of Guangming mountain, Guilin[J].Carsologica Sinica,2021,40(05):860-867. doi: 10.11932/karst2021y30
Citation: TANG Wei,LAN Gaoyong,YIN Jianjun,et al.Distribution and migration of 210Pb and 226Ra in soil in of peak-cluster hillside of Guangming mountain, Guilin[J].Carsologica Sinica,2021,40(05):860-867. doi: 10.11932/karst2021y30
shu

Distribution and migration of 210Pb and 226Ra in soil in of peak-cluster hillside of Guangming mountain, Guilin

doi: 10.11932/karst2021y30

  • Institute of Karst Geology，CAGS/Key Laboratory of Karst Dynamics，MNR & GZAR，Guilin，Guangxi 541004， China

Funds:

 2017GXNSFBA198197

 2018-242-Z01

 2020006

 2020GXNSFAA159066

  • Received Date: 2020-12-14
  • Publish Date: 2021-10-25
    Abstract
  • There are still certain problems as to single 210Pb technology used to estimate soil erosion， water and soil loss and sediment source，etc. of karst region. Due to different soil thicknesses， the difficulty in accurately determining the supported 210Pb specific radioactivity is a key problem of this method. To solve this problem，four soil profiles of this study were selected on the hillside of karst peak-cluster. The distribution of 210Pb and 226Ra in the soil profile was analyzed； the specific radioactivity of supported 210Pb was preliminarily determined； and the influencing factors of the distribution of 210Pb and 226Ra were discussed . The results demonstrate that the vertical distribution of 210Pb in the four soil profiles shows exponential decay. The specific radioactivity of 226Ra keeps stable with the distribution of soil depth， but its mean value varies greatly among different soil profiles. About 95% of 210Pbex in soil of the hillside of Guangming mountain mainly concentrates at a depth of 0-10 cm. Below 20-30 cm from the surface is mainly supported 210Pb. The specific radioactivity of supported 210Pb in soil is about 56.60±11.97 Bq⋅kg-1， consistent with the value of 226Ra 64.93±8.83 Bq⋅kg-1 within the error range. The further study shows that 210Pb in the soil profile is affected by atmospheric deposition， vegetation cover type， topographic conditions， and soil characteristics （especially those of organic matter in the study area）. In addition， the fluctuation of 226Ra in the soil profile is mainly affected by soil characteristics and vegetation types.

     

    • TANG Wei,LAN Gaoyong,YIN Jianjun,et al.Distribution and migration of 210Pb and 226Ra in soil in of peak-cluster hillside of Guangming mountain, Guilin[J].Carsologica Sinica,2021,40(05):860-867.
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