Nitrogen Rate and Source Effects on Nitrous Oxide Emissions from Irrigated Cropping Systems in Colorado (North America)

摘要

N itrogen application generally increases N2O emissions from irrigated cropping systems in the Central Great Plains (Mosier et al., 2006; Snyder et al., 2007; Halvorson et al., 2008a). Nitrous oxide is the principal noncarbon greenhouse gas emitted from soils and is produced through nitrifi cation and denitrifi cation processes in the soil. Agriculture contributes approximately 78% of the total N2O emissions in the USA (Snyder et al., 2007). Snyder et al. (2007) presented an extensive review of greenhouse gas emissions from cropping systems, but little information was available on the effects of N fertilization on N2O emissions from semi-arid, irrigated cropping systems in the western U.S.