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Nutrient supply at the local tree level in mixed forests of sessile oak and beech

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Abstract

In mixed-species forests, tree species composition can affect nutrient return through litter fall. This in turn is expected to have an effect on soil available nutrients, which could influence the nutrient status at the local tree level. Using ion-exchange resins, we estimated resin available soil nutrients at two depths beneath target trees of sessile oak and beech in the Belgian Ardennes. First we tested whether resin available nutrients were related to tree nutrition, using foliar nutrient concentrations as a proxy. In a second step, we tested whether local litter fall, through total nutrient return or litter species composition, affected resin available nutrients. In a final stage, we tested the impacts of local stand composition, as an integrated proxy of above- and belowground processes, and compared them to those of litter composition. With the exception of P for oak, nutrient supply was only poorly related to foliar nutrient concentrations for both target species. The effects of litter fall on nutrient supply were driven by litter species composition and not by total nutrient inputs. Litter composition and local stand composition effects were in close agreement. Our results show that nutrient supply to target trees in mixed-species stands is affected by local neighbourhoods, yet to a limited extent. Direct translation of resin available nutrients into foliar concentrations is probably hampered by complex capture patterns.

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Acknowledgements

Hans Nickmans obtained a Ph.D. Grant from the ‘Fonds National de la Recherche Scientifique’ (FNRS-FRIA). We thank Bernd Zeller and Séverine Bienaimé from INRA for their input on the use of the resin capsules. For their help with the construction of the capsules, we would like to thank René Nickmans and Olivier Bouchez. We would like to thank Sébastien François, François Plume, Olivier Bouchez and Thibaut Thyrion for their help with the placement and recovery of the capsules in the field and Astrid Vannoppen and Jorgen Opdebeeck for the soil analysis and dendrometric measurements. For help and input with the development and execution of the laboratory extractions, we thank Karine Henin, Jean-Charles Bourgeois, Florent Thyrion, Nathan Hesbois and Brecht Herman. We also thank the two anonymous reviewers for their helpful comments and constructive feedback.

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Correspondence to Hans Nickmans.

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Communicated by Agustín Merino.

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Nickmans, H., Titeux, H., Verheyen, K. et al. Nutrient supply at the local tree level in mixed forests of sessile oak and beech. Eur J Forest Res 137, 807–817 (2018). https://doi.org/10.1007/s10342-018-1141-0

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  • DOI: https://doi.org/10.1007/s10342-018-1141-0

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