Biogeosciences
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Articles | Volume 23, issue 11
Articles | Volume 23, issue 11
https://doi.org/10.5194/bg-23-3855-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-23-3855-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 23, issue 11
Research article
 | 
11 Jun 2026
Research article |  | 11 Jun 2026

Bomb-radiocarbon signal suggests that soil carbon contributes to chlorophyll a in archival oak leaves

Naoto F. Ishikawa, Hisami Suga, Tessa S. van der Voort, Reto Nyffeler, Nanako O. Ogawa, Negar Haghipour, Lukas Wacker, Timothy I. Eglinton, and Naohiko Ohkouchi

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Short summary
The main finding of this work is that chlorophyll a in plant leaves is made from atmospheric CO2 (83 ± 2 %) as well as soil carbon (17 ± 2 %), the latter of which is older than 1000 years. The results suggest that radiocarbon age and provenance within a single tree are more diverse than previously thought.
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