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Refining the factors affecting N2O emissions from upland soils with or without N fertilizer application at a global scale


doi:  10.1007/s00376-024-3234-7

  • Nitrous oxide (N2O), a long-lived greenhouse gas, is mainly attributed to agricultural soils, which attracted tremendous concentrations to investigate its sources, affecting factors and effective mitigation practices in recent decades. However, the hierarchy of factors influencing N2O emissions from agricultural soils at the global scale remained unclear. In this study, we carried out correlation and structural equation modeling analysis on a large global N2O emission dataset to explore the hierarchy of influencing factors affecting N2O emissions from the non-nitrogen (N) and N fertilized upland farming systems, in aspects of climatic factors, soil properties and agricultural practices. Our results showed that the average N2O emission intensity in the N fertilized soils (17.83 g N ha–1 day–1) was three times significantly greater than that in the non-N fertilized soils (5.34 g N ha−1 day−1) (p < 0.001). N2O emission intensity was significantly correlated with climatic factors, soil properties and agricultural practices. Climate factors and agricultural practices were the most important effect factors on N2O emission in non-N fertilized and fertilized upland soils, respectively. The variance partitioning analysis for the three major climatic zones indicated that soil properties and climate were the key influencing factors in non-N fertilized soils, and soil properties and agricultural practices were the key factors in N fertilizer soils. Deploying enhanced agricultural practices, such as reduced fertilizer N rate combined with the addition of nitrification and urease inhibitors can potentially mitigate N2O emissions by more than 60% in upland farming systems.
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Manuscript History

Manuscript received: 20 September 2023
Manuscript revised: 19 December 2023
Manuscript accepted: 01 February 2024
通讯作者: 陈斌, bchen63@163.com
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Refining the factors affecting N2O emissions from upland soils with or without N fertilizer application at a global scale

Abstract: Nitrous oxide (N2O), a long-lived greenhouse gas, is mainly attributed to agricultural soils, which attracted tremendous concentrations to investigate its sources, affecting factors and effective mitigation practices in recent decades. However, the hierarchy of factors influencing N2O emissions from agricultural soils at the global scale remained unclear. In this study, we carried out correlation and structural equation modeling analysis on a large global N2O emission dataset to explore the hierarchy of influencing factors affecting N2O emissions from the non-nitrogen (N) and N fertilized upland farming systems, in aspects of climatic factors, soil properties and agricultural practices. Our results showed that the average N2O emission intensity in the N fertilized soils (17.83 g N ha–1 day–1) was three times significantly greater than that in the non-N fertilized soils (5.34 g N ha−1 day−1) (p < 0.001). N2O emission intensity was significantly correlated with climatic factors, soil properties and agricultural practices. Climate factors and agricultural practices were the most important effect factors on N2O emission in non-N fertilized and fertilized upland soils, respectively. The variance partitioning analysis for the three major climatic zones indicated that soil properties and climate were the key influencing factors in non-N fertilized soils, and soil properties and agricultural practices were the key factors in N fertilizer soils. Deploying enhanced agricultural practices, such as reduced fertilizer N rate combined with the addition of nitrification and urease inhibitors can potentially mitigate N2O emissions by more than 60% in upland farming systems.

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