Summary
This laboratory study examined the mechanistic controls on denitrification pathways in grassland soil as a function of saturation and compaction. Using stable isotope analysis of N2O alongside direct flux measurements, the authors demonstrated how soil water content and micropore structure influence the relative production of N2O versus N2, the latter being the benign end-product of complete denitrification. The findings contribute to understanding how soil physical properties modulate one of agriculture's principal greenhouse gas emissions.
UK applicability
The work directly applies to UK grassland systems, which dominate pastoral agriculture and are significant sources of agricultural N2O emissions. The mechanistic insights may inform grassland management practices—such as drainage design and soil compaction avoidance—to reduce N2O losses under the variable moisture conditions typical of the UK climate.
Key measures
N2O and N2 gas flux rates; soil water-filled pore space (WFPS); soil matric potential; isotopocule composition of N2O; denitrification enzyme activity
Outcomes reported
The study measured nitrous oxide (N2O) and dinitrogen (N2) gas fluxes from grassland soil under controlled laboratory conditions varying soil water saturation and compaction. It characterised the ratio of N2O to N2 production during denitrification using isotopocule analysis.
Topic tags
Dig deeper with Pulse AI.
Pulse AI has read the whole catalogue. Ask about this record, its theme, or how the findings apply to UK farming and policy — every answer cites the underlying studies.