Summary
Soil carbon (C) cycling under anoxic conditions is mechanistically linked to dissimilatory iron (Fe) reduction, potentially influenced by exogenous dissolved organic matter (DOM). However, the impact of complex exogenous DOM on soil microbial activity and C-Fe coupling in paddy soils remains underexplored. With a 100-day microcosm experiment, we found that biochar-DOM significantly promoted Fe reduction and accelerated CH<sub>4</sub> and CO<sub>2</sub> emissions, and manure-DOM increased soil CO<sub>2</sub> emissions. These effects may be caused by the following mechanisms: DOM molecules with high aromaticity and high double bond equivalence (DBE), including lignins-polyphenols, lignins-polycyclic aromatics, and condensed aromatics-polycyclic aromatics, promoted soil Fe reduction and CH<su
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