Summary
This field-based study of sheep grazing on organic soils reveals that nitrification is the critical bottleneck controlling nitrous oxide emissions from urine patches. By directly measuring N2O fluxes and quantifying nitrification processes, the authors derived emission factors substantially lower (43% reduction) than prevailing country-specific values, suggesting current inventory estimates for sheep excreta may overestimate climate impact from extensively managed grazing systems.
UK applicability
Given the prevalence of organic farming on UK peatlands and the extensive sheep grazing systems common in upland regions, these findings have direct relevance to UK agricultural greenhouse gas accounting and may inform more accurate national inventory methodologies for livestock emissions on organic soils.
Key measures
N2O emissions from sheep excreta; nitrification rates; emission factor (EF) comparison; organic soil conditions
Outcomes reported
The study investigated nitrous oxide (N2O) emissions from sheep urine patches on extensively grazed organic soils, identifying nitrification as the rate-limiting process. Researchers quantified emissions and compared findings to country-specific emission factors, finding a 43% reduction when using their measured data.
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