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Article

N2O Emissions from Two Austrian Agricultural Catchments Simulated with an N2O Submodule Developed for the SWAT Model

1
Institute for Hydrology and Water Management, Department of Water, Atmosphere and Environment, University of Natural Resources & Life Science, 1190 Vienna, Austria
2
Institute for Water Quality and Resource Management, TU Wien, 1040 Vienna, Austria
3
Institute of Soil Research, Department of Forest and Soil Sciences, University of Natural Resources & Life Science, 3430 Tulln an der Donau, Austria
4
Institute of Agronomy, Department of Crop Science, University of Natural Resources & Life Science, 3430 Tulln an der Donau, Austria
*
Author to whom correspondence should be addressed.
Academic Editor: Xiaopeng Gao
Atmosphere 2022, 13(1), 50; https://doi.org/10.3390/atmos13010050
Received: 16 November 2021 / Revised: 12 December 2021 / Accepted: 24 December 2021 / Published: 28 December 2021
(This article belongs to the Special Issue Agricultural Greenhouse Gas Emissions)
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 (K2) and also to isolate N2O from the simulated denitrification (N2O + N2) 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. View Full-Text
Keywords: SWAT; N2O submodule; N2O emission factor; agricultural catchments; model performance SWAT; N2O submodule; N2O emission factor; agricultural catchments; model performance
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MDPI and ACS Style

Wang, C.; Schürz, C.; Zoboli, O.; Zessner, M.; Schulz, K.; Watzinger, A.; Bodner, G.; Mehdi-Schulz, B. N2O Emissions from Two Austrian Agricultural Catchments Simulated with an N2O Submodule Developed for the SWAT Model. Atmosphere 2022, 13, 50. https://doi.org/10.3390/atmos13010050

AMA Style

Wang C, Schürz C, Zoboli O, Zessner M, Schulz K, Watzinger A, Bodner G, Mehdi-Schulz B. N2O Emissions from Two Austrian Agricultural Catchments Simulated with an N2O Submodule Developed for the SWAT Model. Atmosphere. 2022; 13(1):50. https://doi.org/10.3390/atmos13010050

Chicago/Turabian Style

Wang, Cong, Christoph Schürz, Ottavia Zoboli, Matthias Zessner, Karsten Schulz, Andrea Watzinger, Gernot Bodner, and Bano Mehdi-Schulz. 2022. "N2O Emissions from Two Austrian Agricultural Catchments Simulated with an N2O Submodule Developed for the SWAT Model" Atmosphere 13, no. 1: 50. https://doi.org/10.3390/atmos13010050

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