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Growth response of Brachystegia longifolia to copper mining pollution-induced heavy metal stress

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Abstract

Elevated concentration of heavy metals has been reported in Brachystegia longifolia trees attributed to pollution emanating from a copper mine in Mufulira, Zambia. This study investigates the growth response of B. longifolia to copper mining pollution induced growth stress. Wood discs were extracted at breast height from eight sampling sites established along a transect up- and downwind of the mine, representing polluted and unpolluted areas. The annual ring width was measured using a LINTAB supported by TSAP-Win software. Significant decreases were observed in B. longifolia radial growth on polluted sites compared to control sites. The tree growth reduction was attributed to Cu and Fe phytotoxicities through a multivariate analysis and the reduced growth manifested in a decreased ring width in response to heavy metal stress on polluted sites. This study demonstrates that B. longifolia trees are vulnerable to copper mining pollution and that the mining activities affect the wood quality negatively.

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Acknowledgements

The authors would like to thank the Faculty of AgriScience from Stellenbosch University for the study bursary for the main author, Copperbelt University for facilitating sample collection and Mopani Copper Mines for the permission to sample in their mining protected area.

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Authors

Contributions

CM: Study conceptualization, sample collection, data analysis and manuscript drafting. CM, CC and MM: Study design and results interpretation. CC and MM: Mobilised resources and supervised the study. MM: Manuscript editing. All authors read and approved the final manuscript.

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Correspondence to M. Meincken.

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The authors have no competing interests to declare that are relevant to the content of this article.

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This article does not contain any studies with human participants performed by any of the authors.

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Editorial responsibility: Samareh Mirkia.

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Mulenga, C., Clarke, C. & Meincken, M. Growth response of Brachystegia longifolia to copper mining pollution-induced heavy metal stress. Int. J. Environ. Sci. Technol. 20, 5241–5252 (2023). https://doi.org/10.1007/s13762-022-04310-9

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  • DOI: https://doi.org/10.1007/s13762-022-04310-9

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