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Effect of tree mixtures and water availability on belowground complementarity of fine roots of birch and pine planted on sandy podzol

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A Correction to this article was published on 18 December 2020

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Abstract

Aims

We investigated whether tree species growing in mixtures and under different water supply would segregate their fine roots vertically, produce more fine roots overall, or only in specific soil layers.

Methods

We examined the biomass, morphology, and distribution of fine roots down to 90 cm (forest floor, 0–5, 5–15, 15–30, 30–60, 60–90 cm) in pure and mixed stands of 10-year-old birch and pine trees, planted on a sandy podzol with discontinuous hardpan and seasonal high water table, following a randomized block design with four blocks receiving irrigation and four blocks left unirrigated during summer.

Results

Our results did not show any vertical root segregation between birch and pine in mixed plots. None of the species overyielded belowground throughout, but pine developed more roots in the top soil layer under irrigation. Both species had shallower fine root distributions in wet conditions, especially birch that was more plastic than pine in response to irrigation.

Conclusions

Both species followed similar ecological strategies, occupying and competing for the same layers of the soil profile, under both control and irrigated conditions. However, the greater allocation of pine roots at the top soil horizons under irrigated conditions suggests locally favourable niches can lead to depth-specific asymmetric competition. This sheds new light on vertical niche partitioning of young tree mixtures under varying environmental conditions.

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Acknowledgements

This study was supported by the ANR project DiPTiCC (16-CE32-0003). We thank the Forest experimental Facility (UEFP-https://doi.org/10.15454/1.5483264699193726E12) and especially Bernard Issenhuth for maintenance of the ORPHEE experiment. We thank Coralie Chesseron and Nathalie Gallegos, for their assistance in the lab, Catherine Lambrot and Sylvie Milin for their priceless participation on the field, Pietro Barbieri, Ulysse Gaudaré and Tania Maxwell for their guidance in handling statistics in R, and David Vidal for creating the ombrothermic diagram.

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Correspondence to Andreas Altinalmazis-Kondylis.

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The authors declare that they have no conflict of interest.

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Responsible Editor: Michael Luke McCormack.

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The original online version of this article was revised: The correct supplementary material is presented in this correction article.

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Altinalmazis-Kondylis, A., Muessig, K., Meredieu, C. et al. Effect of tree mixtures and water availability on belowground complementarity of fine roots of birch and pine planted on sandy podzol. Plant Soil 457, 437–455 (2020). https://doi.org/10.1007/s11104-020-04741-8

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  • DOI: https://doi.org/10.1007/s11104-020-04741-8

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