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

被引:2
作者
Wang, Cong [1 ]
Schuerz, Christoph [1 ]
Zoboli, Ottavia [2 ]
Zessner, Matthias [2 ]
Schulz, Karsten [1 ]
Watzinger, Andrea [3 ]
Bodner, Gernot [4 ]
Mehdi-Schulz, Bano [1 ,4 ]
机构
[1] Univ Nat Resources & Life Sci, Inst Hydrol & Water Management, Dept Water Atmosphere & Environm, A-1190 Vienna, Austria
[2] TU Wien, Inst Water Qual & Resource Management, A-1040 Vienna, Austria
[3] Univ Nat Resources & Life Sci, Dept Forest & Soil Sci, Inst Soil Res, A-3430 Tulln An Der Donau, Austria
[4] Univ Nat Resources & Life Sci, Dept Crop Sci, Inst Agron, A-3430 Tulln An Der Donau, Austria
关键词
SWAT; N2O submodule; N2O emission factor; agricultural catchments; model performance; NITROUS-OXIDE PRODUCTION; NITROSOMONAS-EUROPAEA; MANAGEMENT-PRACTICES; GENERALIZED-MODEL; GAS EMISSIONS; NITRIC-OXIDE; SOIL-WATER; NITRIFICATION; DENITRIFICATION; NO;
D O I
10.3390/atmos13010050
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
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.
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页数:28
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