Abiotic reactions drive post-wetting soil emissions of N₂O and NO and contribute partially to CO₂ emissions.

ABSTRACT: Pulse emissions of soil trace gases (carbon dioxide: CO₂, nitrous oxide: N₂O, and nitric oxide: NO) following the wetting of dry soils may contribute disproportionately to total annual trace gas emissions in drylands. These pulses are driven by coupled biotic-abiotic processes that are challenging to partition. Here we measured soil trace gases emissions after the wetting of γ-irradiated and live intact cores of soils with different soil C and N pools, exchangeable cations, and microbial activity. For all soils, the emissions pulse of CO₂ and N-oxides was measured within 5 min of wetting. Post-wetting CO₂ emission pulses from the live soils were approximately twice as large as those from the γ-irradiated soils and were correlated with soil C cont

SUBMITTER: Yagle I 

PROVIDER: S-EPMC12311206 | biostudies-literature | 2025 Jul

REPOSITORIES: biostudies-literature