期刊
ATMOSPHERE
卷 13, 期 1, 页码 -出版社
MDPI
DOI: 10.3390/atmos13010050
关键词
SWAT; N2O submodule; N2O emission factor; agricultural catchments; model performance
资金
- China Scholarship Council [201708620181]
- NitroClimAT project - Austrian Climate and Energy Fund in the 10th call of the ACRP program [KR17AC0K13625]
Quantifying N2O emissions from agroecosystems is challenging due to the lack of measured data and high spatial variability. A submodule based on the SWAT model was developed to simulate N2O emissions and emission factors, capturing the impact of N fertilizer application on N2O emissions through simulated water balance.
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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据