Tree organ growth and carbon allocation dynamics impact the magnitude and δ13C signal of stem and soil CO2 fluxes

Author:

Tang Yu123ORCID,Schiestl-Aalto Pauliina45,Saurer Matthias6ORCID,Sahlstedt Elina1,Kulmala Liisa237,Kolari Pasi45,Ryhti Kira23,Salmon Yann2345ORCID,Jyske Tuula8,Ding Yiyang93ORCID,Bäck Jaana23,Rinne-Garmston Katja T1

Affiliation:

1. Bioeconomy and Environment Unit, Natural Resources Institute Finland , Latokartanonkaari 9, FI-00790 Helsinki, Finland

2. Institute for Atmospheric and Earth System Research (INAR)/Forest Sciences , Faculty of Agriculture and Forestry, , P.O. Box 27, FI-00014 Helsinki, Finland

3. University of Helsinki , Faculty of Agriculture and Forestry, , P.O. Box 27, FI-00014 Helsinki, Finland

4. Institute for Atmospheric and Earth System Research (INAR)/Physics , Faculty of Science, , P.O. Box 68, FI-00014 Helsinki, Finland

5. University of Helsinki , Faculty of Science, , P.O. Box 68, FI-00014 Helsinki, Finland

6. Forest Dynamics, Swiss Federal Institute for Forest, Snow and Landscape Research WSL , Zürcherstrasse 111, 8903 Birmensdorf, Switzerland

7. Finnish Meteorological Institute , P.O. Box 503, FI-00101 Helsinki, Finland

8. Production Systems Unit, Natural Resources Institute Finland , Tietotie 2, FI-02150 Espoo, Finland

9. Department of Forest Sciences , Faculty of Agriculture and Forestry, , P.O. Box 27, FI-00014 Helsinki, Finland

Abstract

Abstract Incomplete knowledge of carbon (C) allocation dynamics in trees hinders accurate modeling and future predictions of tree growth. We studied C allocation dynamics in a mature Pinus sylvestris L. dominated forest with a novel analytical approach, allowing the first comparison of: (i) magnitude and δ13C of shoot, stem and soil CO2 fluxes (Ashoot, Rstem and Rsoil), (ii) concentration and δ13C of compound-specific and/or bulk non-structural carbohydrates (NSCs) in phloem and roots and (iii) growth of stem and fine roots. Results showed a significant effect of phloem NSC concentrations on tracheid growth, and both variables significantly impacted Rstem. Also, concentrations of root NSCs, especially starch, had a significant effect on fine root growth, although no effect of root NSC concentrations or root growth was detected on Rsoil. Time series analysis between δ13C of Ashoot and δ13C of Rstem or δ13C of Rsoil revealed strengthened C allocation to stem or roots under high C demands. Furthermore, we detected a significant correlation between δ13C of Rstem and δ13C of phloem sucrose and glucose, but not for starch or water-soluble carbohydrates. Our results indicate the need to include C allocation dynamics into tree growth models. We recommend using compound-specific concentration and δ13C analysis to reveal C allocation processes that may not be detected by the conventional approach that utilizes bulk organic matter.

Funder

European Research Council

Academy of Finland

Center of Excellence in Atmospheric Sciences, University of Helsinki Funds

Kone Foundation

Knut and Alice Wallenberg Foundation

Finnish Cultural Foundation

Publisher

Oxford University Press (OUP)

Subject

Plant Science,Physiology

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