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Extracellular electron transfer improves the regeneration of iron-bound organic carbon in flooding soil
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J
Y
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S
P
李
S
DOI：10.1016/j.gca.2026.07.012.png)
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Abstract
En 中文
Soil organic carbon (SOC) is protected by combining with iron (Fe) minerals, which supports the stability of soil carbon pool. However, in flooding soils, the microbial dissimilatory Fe reduction can enhance the activation of Fe minerals and the decomposition of Fe-bound organic carbon (Fe-OC). In this study, we found that exposure to enhanced extracellular electron transfer (EET) promoted the reductive dissolution of Fe minerals and the subsequent regeneration of stable Fe mineral, accompanied by the depolymerization metabolism of Fe-OC and microbial reformation. Previously depolymerized SOC was converted into microbial derivatives and combined with the regenerated stable Fe minerals, while increasing the contribution of the “direct Fe protection” pathway (17.2 ± 2.1%) and the “microbial processing” pathway (43.5 ± 7.8%) to Fe-OC. Finally, exposure to enhanced EET increased Fe-OC by 23 ± 4%, mainly related to stable Fe minerals. Here, artificially induced electron transfer is proposed as a strategy to extend the stable carbon pool in soil, though we acknowledge that field-scale scalability, energy costs, and net carbon balance over complete flooding-drainage cycles require further investigation before practical application.
Keywords:
Soil
Electron transfer
Iron-bound organic carbon
Iron minerals
Carbonsequestration
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