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Geoscience ›› 2021, Vol. 35 ›› Issue (05): 1425-1432.DOI: 10.19657/j.geoscience.1000-8527.2021.24

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Spatial Distribution Characteristics and Influencing Factors of Soil Lead in Jieyang City, Guangdong Province

ZANG Chuanzi1,2(), WEN Hanhui3, CAI Limei1,2,4(), LUO Jie1, XU Shubang1,2, MEI Jingxian2   

  1. 1. Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, Yangtze University, Wuhan, Hubei 430100, China
    2. College of Resources and Environment, Yangtze University, Wuhan, Hubei 430100, China
    3. No.940 Branch of Nonferrous Metals Geological Bureau of Guangdong Province, Qingyuan, Guangdong 511500, China
    4. Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, Guangdong 510640, China
  • Received:2020-10-12 Revised:2020-12-31 Online:2021-10-10 Published:2021-11-04
  • Contact: CAI Limei

Abstract:

Taking the soil in Jieyang City as the research object, 1,330 surface soil samples (0-20 cm) and 331 deep soil samples (>150 cm) were collected, and the Pb content in soil was determined. GIS spatial ana-lysis technology, semivariogram fitting and variance analysis were used to study the spatial structure, distribution characteristics and influencing factors of soil Pb content. The results showed that there was no obvious Pb pollution in Jieyang city, and the average Pb content in surface soil was 39.26 mg/kg, which was lower than the background value of Pb in Jieyang City (43.71 mg/kg) and slightly higher than that in Guangdong Province (36.00 mg/kg). Enrichment factors showed that the enrichment degree of Pb in the surface soil of the study area is mainly no enrichment and slight enrichment, accounting for 52.11% and 42.63%, respectively, and Pb enrichment is not significant; The spatial distribution of Pb in the surface soil of the study area showed mode-rate autocorrelation. The Pb high value areas of surface soil are mainly distributed in the eastern and southern parts where human activities have a strong influence. According to the classification statistics of land use, soil parent material, soil type and its physical and chemical properties, the Pb content in surface soil of woodland and unused land is the highest; The Pb content in the soil formed by shale weathering is significantly higher than that of other soil-forming parent materials; Pb content in yellow soil is relatively high; Organic carbon and pH were positively correlated with Pb content in soil.

Key words: soil, lead, spatial distribution, influencing factors, Jieyang City

CLC Number: