Resources Science ›› 2021, Vol. 43 ›› Issue (2): 368-379.doi: 10.18402/resci.2021.02.14

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Spatial variability and pollution risk assessment of soil fluorine in the core area of the Middle Route of the South-to-North Water Transfer Project

TAN Li(), WANG Zhanqi(), XUE Zhibin, YANG Bin   

  1. School of Public Administration, China University of Geosciences, Wuhan 430074, China
  • Received:2020-06-18 Revised:2020-09-19 Online:2021-02-25 Published:2021-04-25
  • Contact: WANG Zhanqi E-mail:280368711@qq.com;zhqwang@cug.edu.cn

Abstract:

In order to provide important data and technical support for improving local soil fluorine environment and ensuring water safety in reservoir area, it also provides decision-making basis for local soil remediation and ensure high-quality water diversion to the north, this study quantitatively analyzed the spatial distribution and pollution risk of soil fluorine in the core area of the Middle Route of the South- to- North Water Transfer Project with fragile ecological environment by using the methods of GIS and geostatistics and pollution risk assessment models. The results show that: (1) The soil fluorine content was on the high side and showed clear spatial autocorrelation in the study area. The fluorine density of topsoil increased gradually from west to east and south to middle north, and obviously peaked in Cangfang Town, Xichuan County and Shigu Town, Danjiangkou City in the central eastern part, which was corresponding to the characteristics of regional stratigraphic lithology and soil parent material. Combined with information on the net increment of soil fluorine, it was concluded that the fluorine content in most areas was related to human activities. (2) The degree of fluorine pollution showed obvious regional differentiation, which was mostly resulted from environmental pollution caused by human activities according to the characteristics of geoaccumulation index, except that Xijiadian Town and Songping Town of Danjiangkou City were restricted by structural factors such as soil parent material. (3) The degree of potential ecological risk indicates that level A was mainly distributed in the west and the south of the study area, and level B was concentrated in the central, eastern, and northern parts. The areas with the highest ecological risk were the east of Shengwan Town and the west of Cangfang Town in Xichuan County, Songping Town and Shigu Town in Danjiangkou City.

Key words: core water source area, soil, fluorine, spatial variability, environmental pollution, ecological risk assessment, Middle Route of the South-to-North Water Transfer Project