Biogeosciences
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Articles | Volume 22, issue 18
Articles | Volume 22, issue 18
https://doi.org/10.5194/bg-22-4851-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-22-4851-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 22, issue 18
Research article
 | 
23 Sep 2025
Research article |  | 23 Sep 2025

Old carbon, new insights: thermal reactivity and bioavailability of saltmarsh soils

Alex Houston, Mark H. Garnett, and William E. N. Austin

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Short summary
Saltmarshes accumulate carbon through plant growth and older material deposited during tidal inundation. We found that more energy was required to decompose old carbon than younger carbon, and the youngest carbon was also the most susceptible to decomposition in a degradation scenario. Protecting saltmarshes can help prevent carbon losses and reduce CO2 emissions. Including this vulnerable stored carbon in climate policies and carbon credit systems could make them more accurate and effective.
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