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Volume 35 Issue 1
Feb.  2016
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Article Navigation >  CARSOLOGICA SINICA  > 2016  >  35(1): 5-10
YIN Jian-jun, WANG Hua, LUO Wei-qun, TANG Wei. A study on the influencing factors for distribution of 137Cs and 210Pb specific radioactivity in Longhetun karst depression area in Pingguo, Guangxi[J]. CARSOLOGICA SINICA, 2016, 35(1): 5-10. doi: 10.11932/karst20160102
Citation: YIN Jian-jun, WANG Hua, LUO Wei-qun, TANG Wei. A study on the influencing factors for distribution of 137Cs and 210Pb specific radioactivity in Longhetun karst depression area in Pingguo, Guangxi[J]. CARSOLOGICA SINICA, 2016, 35(1): 5-10. doi: 10.11932/karst20160102
shu

A study on the influencing factors for distribution of 137Cs and 210Pb specific radioactivity in Longhetun karst depression area in Pingguo, Guangxi

doi: 10.11932/karst20160102

  • Institute of Karst Geology, CAGS/Key Laboratory of Karst Dynamics, MLR & GZAR/ Key Laboratory of Karst Ecological System and Treatment of Rocky Desertification, MLR / The International Research Center on Karst under the Auspices of UNESCO,

  • Publish Date: 2016-02-25
    Abstract
  • 137Cs and 210Pb radiometric techniques have been widely used in soil erosion research. However, due to the special characteristics of karst area, such as dual-layered structure of surface and subsurface, slowness of soil formation, thin and discontinuous layer and the erodibility of the soil and so on, the applications of 137Cs and 210Pb radiometric techniques to the karst area are limited. In this study, the Longhetun depression profiles in Guohua karst ecological experimental site, Pingguo, Guangxi was chosen as an example. Soil samples along the selected profiles were collect and the specific radioactivities of 137Cs and 210Pb were analysed. The results showed that, (1) positive correlation of 137Cs and 210Pb was found both on the surface and at depths along soil profiles; this phenomenon was largely caused by human activity and soil migration, which also caused the migration of soil composition at depth. (2) Because of the enrichment of 137Cs and 210Pb in the adjacent bare rock, the maximum values of 137Cs and 210Pb specific radioactivity were found in rock cavities which are good spaces for water accumulation. (3) The 137Cs and 210Pb specific radioactivities were relative low at the bottoms of karst depression and karst valley, for perennial runoff causes the soil erosion to happen mainly on the slope and the soil deposition happen at the bottoms. (4) The soil has been well protected in the area after the previous farmlands were returned to forestlands; and the soil from the upstream can be preserved by forest, but the underground leakage cannot be avoided due to the particularity of karst environment.

     

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