Abstract
Heavy metal pollution in roadside soil may harm humans, animals, plants, and local ecosystems. This study aimed to explore the sources and potential ecological risks of heavy metals in soils of roadside trees under different land uses, using soil samples collected from 136 roads across 16 administrative districts in Shanghai. The contents, pollution characteristics, potential ecological risks, and sources of seven heavy metals were analyzed, including Cr, Ni, Cd, Pb, As, Cu, and Zn. Results showed that (1) land use patterns affected the heavy metal contents, with industrial and construction areas showing higher contents while agricultural and forestry areas lower; (2) the ranking of heavy metal pollution levels was Cd > As > Pb > Cu > Ni > Cr > Zn. Cd exhibited the highest potential ecological risk, falling within the moderate to considerable potential ecological risk interval; (3) the sources of Cu, Zn, Cr, Ni, Cd, and Pb were associated with traffic emissions, whereas As had independent other sources and Pb in industrial and construction areas was also influenced by industrial emissions. These results provide valuable references on the control of heavy metal pollutants and the management of land uses in megacities.
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Acknowledgements
We would like to thank “Research Institution of Beautiful China and Ecological Civilization of Shanghai Institute of Technology” and “Shanghai Engineering Research Center of Urban Trees Ecological Application” for their support.
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This work was supported by Shanghai Engineering Research Center of Urban Trees Ecological Application (17DZ2252000), Shanghai Science & Technology Commission (19DZ1203701 and 22dz1202600), and Collaborative Innovation Fund of Shanghai Institute of Technology, Shanghai (XTCX2022-06).
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H. K. and W. B. conceived the idea and designed the research workflow. H. K. and W. J. carried out the experiment and wrote the manuscript. G. H. and Z. Y. performed the data analysis. H. K. and F. S. provided resources needed in the research. Q. Z. and L. N. provided guidance for data analysis. Y. R. revised the manuscript. All authors have read, revised, and approved the submitted version of the manuscript.
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He, K., Wang, J., Geng, H. et al. Will different land uses affect heavy metal pollution in soils of roadside trees? An empirical study from Shanghai. Environ Monit Assess 195, 1388 (2023). https://doi.org/10.1007/s10661-023-12021-y
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DOI: https://doi.org/10.1007/s10661-023-12021-y