Regional inventory of nitric oxide and nitrous oxide emissions for forest soils of southeast Germany using the biogeochemical model PnET‐N‐DNDC

摘要: Though it has been shown recently that forest ecosystems affected by high rates of atmospheric N input are significant sources trace gases, reliable regional estimates the source strength such forests missing. In this study, biogeochemical model Photosynthesis and Evapotranspiration-Nitrification-Denitrification Decomposition (PnET-N-DNDC), which simulates processes involved in gas production emission soils on a daily scale, was used to calculate inventory emissions from southeast Germany for year 1997. Prior its use further validated climate site sensitivity using multiyear observations fluxes at Hoglwald Forest site, Germany, sites Netherlands. On scale Bavaria, NO N2O 1997 were ∼4.21 kt NO-N yr−1 ∼6.64 N2O-N yr−1, respectively. Compared with total annual NOx combustion minor importance [4.6%]. However, summer, [8.8–22.0%] burden, since showed strong seasonal pattern highest during summer. Also, regard N2O, huge variations found. Because periods freezing thawing soils, winter period also contributed significantly [∼38%]. Sensitivity analysis revealed accuracy strongly depended quality data, calculated PnET-N-DNDC very sensitive changes soil texture, carbon content, fertility, and, especially emissions, pH.