Biogeosciences
Biogeosciences
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Articles | Volume 23, issue 17
Articles | Volume 23, issue 17
https://doi.org/10.5194/bg-23-6341-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-23-6341-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 23, issue 17
Research article
 | 
14 Sep 2026
Research article |  | 14 Sep 2026

Dissolved organic carbon-mediated controls dominate soil carbon mineralization in response to freeze-thaw cycles

Jiaxin Yan, Jinyang Zheng, Shuai Zhang, Mingming Wang, Ting Sun, Jiajun Mao, and Zhongkui Luo

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Short summary
Freezing and thawing can speed soil carbon loss in cold regions, and climate change is altering how often these events occur. We incubated soils from different depths under freeze–thaw patterns and measured carbon dioxide release and dissolved carbon. Thaw bursts weakened with repeated cycles, yet higher frequency produced more total carbon loss. Dissolved carbon best predicted losses at all depths, while deeper soils relied more on enzymes and surface soils on organic matter protection.
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