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Geoscience ›› 2022, Vol. 36 ›› Issue (02): 645-654.DOI: 10.19657/j.geoscience.1000-8527.2022.02.25

• Geochemistry • Previous Articles     Next Articles

Distribution Characteristics of Soil Selenium Content and Its Influencing Factors in Sanjiang County, Guangxi

LUO Haiyi1,2(), LUO Xianrong1(), LIU Panfeng1, MA Mingliang2, ZHUO Yinyi2   

  1. 1. Institute of Concealed Deposit Prediction, School of Geosciences, Guilin University of Technology, Guilin, Guangxi 541004, China
    2. No.305 Nuclear Geological Brigade of Guangxi Zhuang Autonomous Region, Liuzhou, Guangxi 545005, China
  • Received:2021-04-10 Revised:2021-11-29 Online:2022-04-10 Published:2022-06-01
  • Contact: LUO Xianrong

Abstract:

Taking the soil of Sanjiang County in Guangxi as the research object, 2,751 samples of surface soil and 180 soil vertical profile samples were collected to determine the content of selenium in soil. The characteristics and influencing factors of soil selenium content were studied by using multivariate statistical analysis, geostatistical method, GIS spatial analysis technique and Pearson correlation analysis. The results showed that the average selenium content in the surface soil of the study area was 0.63 mg/kg and varied from 0.10 to 14.41 mg/kg. The soil is rich in selenium resources, and the area of selenium-full and selenium-rich soil was up to 95.87%. The distribution of selenium content in the soil is controlled by the geological background. The selenium content of the surface soil formed by different parent rocks is quite different. The Cambrian has the highest selenium content in soil with black rock series as parent material, with an average content of 2.58 mg/kg, the variation range is 0.31-14.41 mg/kg. Among different soil types, yellow soil has the highest selenium content, with an average content of 0.75 mg/kg, varying from 0.24 to 2.07 mg/kg, and paddy soil has the lowest selenium content, with an average content of 0.51 mg/kg. The soil selenium content of different land use types is quite different. Except for paddy fields, which are the basic natural state, all other land types are enriched. The selenium content of the surface soil in the study area is generally controlled by the selenium content of the deep soil, and the selenium content of the surface soil has secondary enrichment during the soil formation process. At the same time, soil pH, Corg, P, S, Al2O3, TFe2O3 and CIA also have a certain influence on the distribution of soil selenium content.

Key words: soil selenium content, distribution characteristics, soil parent material, influencing factors, Sanjiang County, Guangxi

CLC Number: