title: Differentiation of nitrous oxide emission factors for agricultural soils.
abstract: Nitrous oxide (N(2)O) direct soil emissions from agriculture are often estimated using the default IPCC emission factor (EF) of 1%. However, a large variation in EFs exists due to differences in environment, crops and management. We developed an approach to determine N(2)O EFs that depend on N-input sources and environmental factors. The starting point of the method was a monitoring study in which an EF of 1% was found. The conditions of this experiment were set as the reference from which the effects of 16 sources of N input, three soil types, two land-use types and annual precipitation on the N(2)O EF were estimated. The derived EF inference scheme performed on average better than the default IPCC EF. The use of differentiated EFs, including different regional conditions, allows accounting for the effects of more mitigation measures and offers European countries a possibility to use a Tier 2 approach.
authors.affiliation: Alterra, Wageningen UR, P.O. Box 47, 6700 AA Wageningen, The Netherlands. janpeter.lesschen@wur.nl
authors.forename: Jan Peter
authors.initials: JP
authors.lastname: Lesschen
authors.forename: Gerard L
authors.initials: GL
authors.lastname: Velthof
authors.forename: Wim
authors.initials: W
authors.lastname: de Vries
authors.forename: Johannes
authors.initials: J
authors.lastname: Kros
mesh_terms: D000383:Agriculture; D000822:Animal Husbandry; D000818:Animals; D004784:Environmental Monitoring; D005308:Fertilizers / Q000032:analysis; D058751:Livestock / Q000254:growth & development; D008372:Manure / Q000032:analysis; D008954:Models, Biological; D009609:Nitrous Oxide / Q000737:chemistry*; D012987:Soil / Q000737:chemistry*
chemical_list: D005308:Fertilizers; D008372:Manure; D012987:Soil; D009609:Nitrous Oxide