Biogeosciences
Biogeosciences
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Articles | Volume 22, issue 23
Articles | Volume 22, issue 23
https://doi.org/10.5194/bg-22-7819-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-22-7819-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 22, issue 23
Research article
 | 
09 Dec 2025
Research article |  | 09 Dec 2025

CO2 and CH4 fluxes from standing dead trees in a northern conifer forest

Christian Hettwer, Kathleen Savage, Andrew Ouimette, Jay Wason, Roel Ruzol, and Shawn Fraver

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Short summary
We measured fluxes of CO2 and CH4 from snags in a Maine forest. CO2 flux peaked at intermediate soil moisture and high temperatures, while CH4 flux peaked under wet conditions and high temperature. CH4 increased most when both temperature and soil moisture were high. As CH4 emissions rose, CO2 emissions dropped along the moisture gradient, reflecting changes in microbial activity in wetter conditions. Our study adds to growing evidence that snags are active participants in forest carbon cycling.
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