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An insight into long-term effects of biochar application on forest soils

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Abstract

Protection and appropriate management of forests is one of the key instruments for climate change adaptation. Soil amendments with biochar have shown to be promising in achieving this goal; however, the evaluation of its long-term effects on forest soils has largely been neglected. To assess the advantages and drawbacks of biochar in forest soils, data from relict charcoal hearths (RCH) can be a potent tool as they show changes in soil properties after up to several hundred years. RCHs can be found in places of former metallurgical hot spots and their presence leaves characteristic formations identifiable on a large scale using laser detection technologies. Forest soils with biochar amendment show an increase in base cations, shift towards more alkaline pH, smaller bulk density and seem to be especially beneficial to hostile environments. Sites with favourable conditions may show little to no improvement or may even be adversely affected. Still, with proper investigation, areas with affordable feedstock materials and poor forest soils—such as spruce monocultures of Central Europe—may benefit from biochar amendments and continue to do so in the long term.

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Acknowledgements

We would like to thank Dr. Ondřej Drábek for his analysis of exchangeable elements in soils from RCHs.

Funding

The research was supported by the Technology Agency of the Czech Republic (project no. TL02000160).

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Correspondence to Hana Johanis.

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The authors declare that they have no known competing financial interests or personal relationships that could influence the work reported in this paper.

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Communicated by Agustín Merino.

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Johanis, H., Lehejček, J. & Tejnecký, V. An insight into long-term effects of biochar application on forest soils. Eur J Forest Res 141, 213–224 (2022). https://doi.org/10.1007/s10342-022-01440-0

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  • DOI: https://doi.org/10.1007/s10342-022-01440-0

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