Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2022, Vol. 38 ›› Issue (17): 103-109.doi: 10.11924/j.issn.1000-6850.casb2021-0995

Special Issue: 生物技术 土壤重金属污染 资源与环境

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Spatial Distribution Characteristics and the Impact Factors of Heavy Metals in Peri-urban Soils Under the Background of Fast Urbanization

GUO Jia1(), JIN Shaofei2,3, WANG Ku2,3()   

  1. 1Academy of Digital China (Fujian), Fuzhou University, Fuzhou 350108
    2Department of Geographic Sciences, School of Geography and Oceanography, Minjiang University, Fuzhou 350108
    3Technology Innovation Center for Monitoring and Restoration Engineering of Ecological Fragile Zone in Southeast China, MNR, Fuzhou 350108
  • Received:2021-10-19 Revised:2021-12-08 Online:2022-06-15 Published:2022-07-08
  • Contact: WANG Ku E-mail:1228122724@qq.com;casboy@163.com

Abstract:

To reveal the effects of rapid urbanization on soil quality in peri-urban areas in Fuzhou, spatial distribution of five heavy metals (Cr, Mn, Cu, Pb and Zn) in these areas were analyzed from 134 soil samples by geostatistic method. The potential ecological risk index was used to evaluate the pollution degree of soil heavy metal, and the impact factors were analyzed by the random forest model. The results showed that great variations were found among the five heavy metals on spatial distribution pattern. The maximum value of each heavy metal was not accordant in space. The average value of the potential ecological hazard index of the five heavy metals was in the order of Pb > Cu > Cr > Mn > Zn. Pb and Cu had the highest value of potential ecological risk index, which reached the degree of strong ecological risk. The relative importance of the impact factors of the five heavy metals in soil was screened by random forest model, and the impact factors were various for the five heavy metals. The results could provide a scientific basis for soil conservation and utilization in urban expansion process.

Key words: soil heavy metal, geostatistics, spatial distribution characteristics, pollution evaluation, peri-urban areas

CLC Number: