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Substrate characteristics controls fungal denitrification and nitrous oxide emissions in an acidic upland soil
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DOI：10.1016/j.apsoil.2026.107375.png)
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Abstract
En 中文
Fungal denitrification has been increasingly recognized as a potentially important source of soil nitrous oxide (N2O) emissions, yet its quantitative contribution and response to agricultural management remain poorly understood. Here, using soils from a long-term fertilization experiment in an acidic upland red soil, we combined microcosm incubation, quantitative PCR, and substrate-induced respiration with selective inhibition (SIRIN) to disentangle the microbial pathways underlying N2O production under different organic amendments. Straw amendments (peanut and rice) significantly increased N2O emissions, with cumulative emissions (984 and 905 μg N kg−1 soil, respectively) an order of magnitude higher than mineral fertilization, whereas radish residues and pig manure showed no significant effects. This stimulation was associated with increased carbon inputs and a pronounced rise in fungal nirK abundance. SIRIN analysis further revealed that fungal denitrification accounted for 69–96% of total N2O emissions in straw-amended soils. Our findings demonstrate that fungal denitrification can dominate N2O production in acidic soils and is highly sensitive to substrate characteristics, highlighting the importance of organic amendment type in regulating both the magnitude and microbial sources of soil N2O emissions.
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