Summary
This laboratory incubation study examined how soil saturation influences nitrous oxide emissions from grassland soil, with particular attention to the interaction between moisture and soil physical structure (compaction) at the micropore scale. The research demonstrates that emission variability and the dominant nitrogen cycling pathway (denitrification vs. nitrification) shift with saturation state, with evidence of distinct nitrogen pools exhibiting different isotopic fractionation patterns. The findings suggest that soil water management and compaction practices in grassland systems may substantially influence greenhouse gas emissions through their effects on soil pore structure and microbial activity.
UK applicability
Given that this work was conducted on a grassland soil under laboratory conditions, the findings are directly relevant to understanding N2O emissions from UK pasture-based systems. The results may inform management practices around soil compaction and drainage in grasslands, though field validation under UK climatic and soil conditions would strengthen applicability to operational farm settings.
Key measures
N2O and N2 flux emissions, water-filled pore space (WFPS) %, N2O isotopocules, soil saturation levels, nutrient distribution heterogeneity
Outcomes reported
The study measured nitrous oxide (N2O) and dinitrogen (N2) gas emissions, along with N2O isotopocules, from grassland soil at varying saturation levels. Findings demonstrated differential emission patterns and source mechanisms (denitrification vs. nitrification) depending on soil moisture and saturation state.
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