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Litter breakdown as a tool for assessment of the efficiency of afforestation and ash-aided phytostabilization on metal-contaminated soils functioning in Northern France

Abstract

The main objective of the study was to assess the efficiency of phytoremediation methods implemented for 14 years on highly metal-contaminated soils. The different experimental strategies were plots planted with a tree mix or with a single tree species coupled or not with the use of fly-ashes as an amendment to limit metals mobility in soil. The breakdown of poplar litter on the four plots was monitored during 10 months. In parallel, colonization of litter bags by functional groups of mesofauna (Collembola and Acari) was followed. Two mesh-sized litter bags were used to allow distinguishing microbial and mesofaunal actions on the litter breakdown. We observed the breakdown of litter in four studied plots. Litter breakdown occurred faster in 3-mm litter bags than 250 μm ones during summer demonstrating the importance of mesofauna. Mixed plantation allowed faster litter breakdown than mono-specific plantation. A higher abundance of mesofauna and/or better abiotic conditions (moisture, shading…) could explain this result. Regarding litter breakdown and mesofauna, no significant difference was observed between the amended plots and those subjected to soil phytomanagement. However, communities of the studied area are disturbed since a low abundance of detritivores was observed. This could explain also the slower litter breakdown than expected in our study. To conclude, among the phytomanagement methods tested, mixed plantations could provide a benefit for the restoration of degraded soils. By contrast, the use of fly-ashes does not seem to have any effect on the functionality of ecosystem neither on the litter breakdown process nor on the abundance of mesofauna.

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Acknowledgements

The authors thank Agnieska Rorat for his language help and Sébastien Détriché for the realization of maps. This study was undertaken under the research program “ResBioFonc”.The authors are grateful to the company “STB Matériaux” for having authorized access at the experimental field.

Funding

Financial support for this work was provided by the Regional Council of Hauts-de-France, the “French Foundation for Research on Biodiversity” (FRB), and Catholic University of Lille.

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Correspondence to Julie Leclercq-Dransart.

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Responsible editor: Elena Maestri

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Leclercq-Dransart, J., Santorufo, L., Pernin, C. et al. Litter breakdown as a tool for assessment of the efficiency of afforestation and ash-aided phytostabilization on metal-contaminated soils functioning in Northern France. Environ Sci Pollut Res 25, 18579–18595 (2018). https://doi.org/10.1007/s11356-018-2038-7

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  • DOI: https://doi.org/10.1007/s11356-018-2038-7

Keywords

  • Soil remediation
  • Soil functionality
  • Litter bag method
  • Metal contamination
  • Fly-ashes
  • Phytomanagement
  • Collembola
  • Acari