Improving and disaggregating N2O emission factors for ruminant excreta on temperate pasture soils

摘要: Abstract Cattle excreta deposited on grazed grasslands are a major source of the greenhouse gas (GHG) nitrous oxide (N2O). Currently, many countries use IPCC default emission factor (EF) 2% to estimate excreta-derived N2O emissions. However, emissions can vary greatly depending type (dung or urine), soil and timing application. Therefore three experiments were conducted quantify their associated EFs, assess effect type, season application magnitude losses. dung, urine artificial treatments applied in spring, summer autumn temperate grassland sites with varying weather conditions. Nitrous measured from over 12 months generate annual factors. The EFs treated was greater (0.30–4.81% for real 0.13–3.82% synthetic urine) when compared dung (− 0.02–1.48%) treatments. driven by environmental conditions could be predicted rainfall temperature before, moisture deficit after application; highlighting potential decision support tool reduce modifying grazing management based these parameters. Emission factors varied seasonally highest also dependent lowest observed well-drained imperfectly drained soil. averaged 0.31 1.18% cattle urine, respectively, both which considerably lower than value 2%. These results lowering disaggregating type.