Modeling growing season and annual cumulative nitrous oxide emissions and emission factors from organically fertilized soils planted with barley in Lethbridge, Alberta, Canada

摘要: Abstract The widely used Denitrification-Decomposition (DNDC) model does not explicitly account for the influence of microbes in organic fertilizer. However, applying fertilizers to soils may increase N2O emissions because can contain appreciable levels plant-available nitrogen (N), and many types including denitrifiers. In this study, DNDC was extended include a microbial factor enhancement contents by fertilizer input, applied two organically fertilized (digestate manure) planted with barley Lethbridge, Alberta, Canada. growing season cumulative at recommended N rate digestate manure were calibrate model, while double loadings validation. results show that calculated be 1.90, 1.62, 3.50, 2.55 kg-N ha−1 digestate, 0.45, 0.17, 0.35, 0.74 kg-N ha−1 2008, 2009, 2010, 2011 respectively. corresponding emission factors (EFs) are 0.937, 0.444, 1.947, 0.510, as well 0.095, 0.035, 0.072, 0.083 average four-year relative errors EFs validated cases 32.3% 34.3% 66.9% 126% manure, Two-factor hyperbolic quadratic models correlating weather conditions developed data loadings. coefficients determination modeled measured values 0.887 0.982 two-factor predicted would range from 0.085% 1.1% ranging 100 800 kg-N ha−1, product precipitation air temperature during 18 36 mm × oC. ranged 1.0 5.1 kg-N ha−1. We conclude EFS could effectively equation manure.