<trans-title>Distribution and migration of <sup>210</sup>Pb and <sup>226</sup>Ra in soil in of peak-cluster hillside of Guangming mountain, Guilin

TANG Wei; LAN Gaoyong; YIN Jianjun; YANG Hui; WU Xia

doi:10.11932/karst2021y30

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

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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

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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

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.
- karst soil,
- supported ²¹⁰Pb,
- ²²⁶Ra,
- peak-cluster,
- Guilin

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References

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