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Gewählte Publikation:

Wang, C; Schuerz, C; Zoboli, O; Zessner, M; Schulz, K; Watzinger, A; Bodner, G; Mehdi-Schulz, B.
(2022): N2O Emissions from Two Austrian Agricultural Catchments Simulated with an N2O Submodule Developed for the SWAT Model
ATMOSPHERE-BASEL. 2022; 13(1), 50 FullText FullText_BOKU

Abstract:
Nitrous oxide (N2O) is a potent greenhouse gas stemming mainly from nitrogen (N)-fertilizer application. It is challenging to quantify N2O emissions from agroecosystems because of the dearth of measured data and high spatial variability of the emissions. The eco-hydrological model SWAT (Soil and Water Assessment Tool) simulates hydrological processes and N fluxes in a catchment. However, the routine for simulating N2O emissions is still missing in the SWAT model. A submodule was developed based on the outputs of the SWAT model to partition N2O from the simulated nitrification by applying a coefficient (K-2) and also to isolate N2O from the simulated denitrification (N2O + N-2) with a modified semi-empirical equation. The submodule was applied to quantify N2O emissions and N2O emission factors from selected crops in two agricultural catchments by using NH4NO3 fertilizer and the combination of organic N and NO3- fertilizer as N input data. The setup with the combination of organic N and NO3- fertilizer simulated lower N2O emissions than the setup with NH4NO3 fertilizer. When the water balance was simulated well (absolute percentage error <11%), the impact of N fertilizer application on the simulated N2O emissions was captured. More research to test the submodule with measured data is needed.
Autor*innen der BOKU Wien:
Bodner Gernot
Mayrhofer Bernhard
Mehdi-Schulz Bano
Schulz Karsten
Schürz Christoph
Watzinger Andrea
BOKU Gendermonitor:


Find related publications in this database (Keywords)
SWAT
N2O submodule
N2O emission factor
agricultural catchments
model performance


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