Biogeosciences
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Articles | Volume 23, issue 3
Articles | Volume 23, issue 3
https://doi.org/10.5194/bg-23-1279-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-23-1279-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 23, issue 3
Research article
 | 
13 Feb 2026
Research article |  | 13 Feb 2026

Vulnerability of soil organic carbon in Amazonian Podsols to changes in environmental conditions

Naoise Nunan, Claire Chenu, Valérie Pouteau, André Soro, Kevin Potard, Célia R. Montes, Patricia Merdy, Adolpho J. Melfi, and Yves Lucas

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Short summary
The vulnerability to decomposition of organic C in Amazonian podzols as a result of predicted drier soil moisture regimes was tested: more than four times as much CO2 was released from soils under oxic conditions with the addition of N relative to soils under the prevailing anoxic conditions. An extrapolation of the data to the whole of the Amazonian podzols suggests that this increased C-CO2 flux to the atmosphere could be equivalent to 8 % of the current net global C flux to the atmosphere.
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