Modeling nitrous oxide emissions from tile-drained winter wheat fields in Central France
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Modeling nitrous oxide (N2O) emissions from agricultural soils is still a challenge due to influences of artificial management practices on the complex interactions between soil factors and microbial activities. The aims of this study were to evaluate the process-based DeNitrification-DeComposition (DNDC, version 9.5) model and modified non-linear empirical Nitrous Oxide Emission (NOEV2) model with weekly N2O flux measurements at eight sites cropped with winter wheat across a tile-drained landscape (around 30-km2) in Central France. Adjustments of the model default field capacity and wilting point and the optimum crop production were necessary for DNDC95 to better match soil water content and crop biomass yields, respectively. Multiple effects of varying soil water and nitrate contents on the fraction of N2O emitted through denitrification were added in NOEV2. DNDC95 and NOEV2 successfully predicted background N2O emissions and fertilizer-induced emission peaks at all sites during the experimental period but overestimated the daily fluxes on the sampling dates by 54 and 25 % on average, respectively. Cumulative emissions were slightly overestimated by DNDC95 (4 %) and underestimated by NOEV2 (15 %). The differences between evaluations of both models for daily and cumulative emissions indicate that low frequency measurements induced uncertainty in model validation. Nonetheless, our validations for soil water content with daily resolution suggest that DNDC95 well represented the effect of tile drainage on soil hydrology. The model overestimated soil ammonium and nitrate contents mostly due to incorrect nitrogen partitioning when urea ammonium nitrate solution was applied. The performance of the model would be improved if DNDC included the canopy interception and foliar nitrogen uptake when liquid fertilizer was sprayed over the crops.
KeywordsAgricultural landscape Canopy interception Empirical model N2O reduction Process-based model Tile drainage
This research was supported by the European Union (GHG-Europe No. 244122), the Region Centre and Fonds Européen de Développement Régional (FEDER) (SPATIOFLUX project), INRA (Département Environnement et Agronomie) and Tuck Founding (IMAGINE project).
- Cai Z, Sawamoto T, Li C, Kang G, Boonjawat J, Mosier A, Wassmann R, Tsuruta H (2003) Field validation of the DNDC model for greenhouse gas emissions in East Asian cropping systems. Global Biogeochem Cycle 17. doi: 10.1029/2003GB002046
- Davidson EA (1991) Fluxes of nitrous oxide and nitric oxide from terrestrial ecosystems. In: Rogers JE, Whiteman WB (eds) Microbial production and consumption of greenhouse gases: methane, nitrogen oxides and halomethanes. American Society of Microbiology, Washington, DC, pp 219–235Google Scholar
- Frolking SE, Mosier AR, Ojima DS, Li C, Parton WJ, Potter CS, Priesak E, Stenger R, Haberbosch C, Dorsch P, Flessa H, Smith KA (1998) Comparison of N2O emissions from soils at three temperate agricultural sites: simulation of year-round measurements by four models. Nutr Cycl Agroecosys 52:77–105CrossRefGoogle Scholar
- Gabrielle B, Laville P, Duval O, Nicoullaud B, Germon JC, Hénault C (2006b) Process-based modeling of nitrous oxide emissions from wheat-cropped soils at the sub-regional scale. Global Biogeochem Cycle 20, GB4018. doi: 10.1029/2006GB002686
- Granli T, Bøckman OC (1994) Nitrous oxide from agriculture. Norweg J Agr Sci suppl 12:1–128Google Scholar
- Rochette P, Angers DA, Belange G, Chantigny MH, Prevost D, Levesque G (2004) Emissions of N2O from alfalfa and soybean crops in Eastern Canada. Soil Sci Soc Am J 68:493–506Google Scholar
- Stephens JC, Steward EH (1963) A comparison of procedures for computing evaporation and evapotranspiration. Publication 62, International Association of Scientific Hydrology. International Union of Geodynamics and Geophysics, Berkeley, pp 123–133Google Scholar
- van Groenigen JW, Kasper GJ, Velthof, van den Pol-van Dasselaar, Kuikman PJ (2004) Nitrous oxide emissions from silage maize fields under different mineral nitrogen fertilizer and slurry applications. Plant Soil 263:101–111Google Scholar