Abstract
Background and aims
Biochar has been proposed as a tool to enhance phytostabilisation of contaminated soils but little data are available to illustrate the direct effect on roots in contaminated soils. This work aimed to investigate specific root traits and to assess the effect of biochar amendment on contaminant availability.
Methods
Amendment with two different types of biochar, pine woodchip and olive tree pruning, was assessed in a rhizobox experiment with maize planted in a soil contaminated with significant levels of copper and arsenic.
Results
Amendment was found to significantly improve root traits compared to the control soil, particularly root mass density and root length density. Copper uptake to plants and ammonium sulphate extractable copper was significantly less in the biochar amended soils. Arsenic uptake and extractability varied with type of biochar used but was not considered to be the limiting factor affecting root and shoot development.
Conclusions
Root establishment in contaminated soils can be enhanced by biochar amendment but choice of biochar is key to maximising soil improvement and controlling contaminant availability.
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Acknowledgements
This work was carried out as part of a STSM awarded to the lead author by EU COST Action TD1107 Biochar as an option for sustainable resource management. We thank Dr Peter Anderson at SETN (Scottish Environmental Technology Network) for the IC analysis. We thank Dr Saran Sohi of the UKBRC (UK Biochar Research Centre, University of Edinburgh), Edinburgh, for checking the manuscript before submission. We also thank the two anonymous reviewers for improving the manuscript with their comments.
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Brennan, A., Jiménez, E.M., Puschenreiter, M. et al. Effects of biochar amendment on root traits and contaminant availability of maize plants in a copper and arsenic impacted soil. Plant Soil 379, 351–360 (2014). https://doi.org/10.1007/s11104-014-2074-0
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DOI: https://doi.org/10.1007/s11104-014-2074-0