Journal of Ecology and Rural Environment ›› 2019, Vol. 35 ›› Issue (7): 917-924.doi: 10.19741/j.issn.1673-4831.2018.0866

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Spatial Distribution and Genesis of Polycyclic Aromatic Hydrocarbons (PAHs) in the Surface Soil in China

SHANG Qing-bin, DUAN Yong-hong, XU Li-shuai, DUAN Hao-ran, HE Jia-lin, CHENG Rong, WU Meng, LIU Jia-liang   

  1. College of Resources and Environment, Shanxi Agricultural University, Taigu 030801, China
  • Received:2018-12-24 Online:2019-07-25 Published:2019-07-22


In order to comprehensively understand the concentrations and spatial distribution of polycyclic aromatic hydrocarbons in surface soils in China,208 literatures published from 1999 to 2018 on PAHs in the surface soils were collected for data extraction and in-depth analysis. ArcGIS spatial interpolation technique,geographic detector model and statistical method were used to quantitatively analyze the concentration,spatial distribution,main sources,and affecting factors of PAHs in the surface soil in China. The results show that the spatial distribution of PAHs in the surface soil has obvious spatial variation. The PAHs concentrations follow a significant decreasing trend of north China > northeast China > east China > mid-south China > northwest China > southwest China. The average concentration of 16 USEPA priority PAHs in north China is about 2.5 times that of southwest China. The PAHs pollution level in the surface soils in China generally ranged from low to medium according to Maliszewska-Kordybach's classification standard. The moderately polluted, slightly polluted,and uncontaminated soil accounted for approximately 22.6%,71.1% and 6.3%,respectively. Quantitative analysis of nine socio-economic factors by using geo-detector model shows coal-fired power generation is the most significant factor on PAHs spatial distribution compared with the other factors. Principal component analysis also indicates that the coal combustion is the important pollution source,in consistent with the result of geo-detector model. This study has certain reference value for the prevention and scientific control of PAHs pollution in the surface soil in China.

Key words: soil, polycyclic aromatic hydrocarbons(PAHs), spatial distribution, geo-detector model

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