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  • Brunn et al 2022_preprint

    Rights statement: This is the peer reviewed version of the following article:Brunn, M., Hafner, B.D., Zwetsloot, M.J., Weikl, F., Pritsch, K., Hikino, K., Ruehr, N.K., Sayer, E.J. and Bauerle, T.L. (2022), Carbon allocation to root exudates is maintained in mature temperate tree species under drought. New Phytol, 235: 965-977. doi: 10.1111/nph.18157 which has been published in final form at https://nph.onlinelibrary.wiley.com/doi/10.1111/nph.18157 This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.

    Accepted author manuscript, 1.63 MB, PDF document

    Embargo ends: 11/04/23

    Available under license: CC BY-NC: Creative Commons Attribution-NonCommercial 4.0 International License

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Carbon allocation to root exudates is maintained in mature temperate tree species under drought

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Published
  • Melanie Brunn
  • Benjamin D. Hafner
  • Marie J. Zwetsloot
  • Fabian Weikl
  • Karin Pritsch
  • Kyohsuke Hikino
  • Nadine K. Ruehr
  • Emma Sayer
  • Taryn L. Bauerle
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<mark>Journal publication date</mark>31/08/2022
<mark>Journal</mark>New Phytologist
Issue number3
Volume235
Number of pages13
Pages (from-to)965-977
Publication StatusPublished
Early online date11/04/22
<mark>Original language</mark>English

Abstract

Carbon (C) exuded via roots is proposed to increase under drought and facilitate important ecosystem functions. However, it is unknown how exudate quantities relate to the total C budget of a drought-stressed tree, i.e. how much of net-C assimilation is allocated to exudation at the tree level.
We calculated the proportion of daily C assimilation allocated to root exudation during early summer by collecting root exudates from mature Fagus sylvatica and Picea abies exposed to experimental drought, and combining above- and belowground C fluxes with leaf, stem, and fine-root surface area.
Exudation from individual roots increased exponentially with decreasing soil moisture, with the highest increase at the wilting point. Despite ~50 % reduced C assimilation under drought, exudation from fine-root systems was maintained and trees exuded 1.0 % (F. sylvatica) to 2.5 % (P. abies) of net C into the rhizosphere, increasing the proportion of C allocation to exudates two- to threefold. Water-limited P. abies released two-thirds of its exudate-C into the surface soil, whereas it was only one-third in droughted F. sylvatica.
Across the entire root system, droughted trees maintained exudation similar to controls, suggesting drought-imposed belowground C investment, which could be beneficial for ecosystem resilience.

Bibliographic note

This is the peer reviewed version of the following article:Brunn, M., Hafner, B.D., Zwetsloot, M.J., Weikl, F., Pritsch, K., Hikino, K., Ruehr, N.K., Sayer, E.J. and Bauerle, T.L. (2022), Carbon allocation to root exudates is maintained in mature temperate tree species under drought. New Phytol, 235: 965-977. doi: 10.1111/nph.18157 which has been published in final form at https://nph.onlinelibrary.wiley.com/doi/10.1111/nph.18157 This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.