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Examines gas diffusivity effects on N2O emissions in no-till environments, indicating important implications for soil management.
No‐till can conserve soil and store carbon, yet its effects on N 2 O emissions remain inconsistent. Soil gas diffusivity regulates O 2 supply, N 2 O production and reduction, and the N 2 O/(N 2 O + N 2 ) product ratio, but this control is not always explicit when no‐till outcomes are interpreted from surface fluxes alone. We argue that no‐till‐specific physical organization, including surface residue retention, limited mixing, stratification of C, N, and moisture, and persistent pore architecture, helps explain why no‐till N 2 O emissions may increase, decrease, or remain unchanged across soils and hydrological conditions. Restricted gas exchange can shift pathway partitioning, delay gas escape, and temporarily retain N 2 O before release during drying or drainage. The same constraints can lengthen N 2 O residence time and favor reduction to N 2 . We recommend event‐focused surface flux measurements, optional shallow soil N 2 O profiles for a posteriori interpretation, and concurrent gas‐exchange indicators including Dp/Do, air‐filled porosity, air permeability, bulk density, and water status.
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Lee et al. (2026) studied this question.
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