Study on the Core Pathways and Influencing Factors of N2O Emission from Farmland Soils

doi:10.7668/hbnxb.20195794

Abstract

Abstract:

Nitrous oxide(N₂O)is a long-lived greenhouse gas that is closely related to current global warming.With the development of agriculture,farmland soil has become a significant source of N₂O emissions,causing not only the loss of soil nitrogen but also serious environmental problems.The emission of N₂O from farmland soil has become a hot topic in the field of agriculture and environment.In order to better understand the mechanism of N₂O emission from farmland soil,the main biological pathways(biological nitrification,biological denitrification,denitrification by nitrifying bacteria,nitrate reduction to ammonium,fungal denitrification)and abiotic pathways of N₂O emission from farmland soil were discussed in this paper.The effects of endogenous driving factors(soil pH,temperature,moisture,iron form and content,organic carbon content and composition,carbon-nitrogen ratio and bulk density)and exogenous regulatory factors(nitrogen source input,biochar input and atmospheric CO₂ concentration)on farmland soil N₂O emission were reviewed.The relative importance of each pathway of N₂O emission and each influencing factor was clarified,in order to provide theoretical basis for the subsequent formulation of farmland soil N₂O emission reduction program.In addition,it was found that abiotic pathways contribute significantly to N₂O emissions under special conditions,such as flooding or when microbial activity is inhibited,and this pathway is regulated by soil pH value,metal ions(Fe,Mn)and organic matter.However,current studies mainly focus on biological pathways,and the reports on abiotic pathways and their influencing factors are scattered,lacking systematic understanding.Future studies need to pay more attention to abiotic pathways and their interactions with biological pathways in order to better understand the mechanism of soil N₂O emission in farmland and provide scientific guidance for sustainable agricultural development.

Key words: Farmland soil, Nitrous oxide, Biotic pathway, Abiotic pathway, Influencing factor

CLC Number:

FAN Yimin, LIANG Fei, FAN Ziqian, ZHANG Minghu, WANG Yajing. Study on the Core Pathways and Influencing Factors of N₂O Emission from Farmland Soils[J]. Acta Agriculturae Boreali-Sinica, 2025, 40(S1): 229-239. doi: 10.7668/hbnxb.20195794.

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化学反应方程式 Chemical reaction equation	参考文献 Reference
2${{\mathrm{NH}}_{4}}^{+}$+8FeOOH+14H⁺ → N₂O+8Fe²⁺+15H₂O	[30]
2${{\mathrm{NO}}_{3}}^{-}$+8 Fe²⁺+11H₂O → N₂O+8FeOOH+14H⁺	[27]
2${{\mathrm{NO}}_{3}}^{-}$+12 Fe²⁺+11H₂O → N₂O+4Fe₃O₄+22H⁺	[27]
2${{\mathrm{NO}}_{3}}^{-}$+FeO+2H⁺ → N₂O+4FeOOH+1/2H₂O+7/4O₂	[31]
2${{\mathrm{NO}}_{3}}^{-}$+MnO+2H⁺ → N₂O+MnO₂+3/2O₂+H₂O	[31]
2NH₂OH+4Fe³⁺ → N₂O+4Fe²⁺+H₂O+4H⁺	[32]
NH₂OH+4FeOOH+8H⁺ → N₂O+4Fe²⁺+9H₂O	[33]
2NH₂OH+2MnO₂+MnO+1/2O₂+4H⁺ → N₂O+2Mn²⁺+5H₂O	[31]
2NH₂OH+2MnO₂ → N₂O+2MnO+3H₂O	[31]
${{\mathrm{NO}}_{2}}^{-}$+H⁺ → N₂O+H₂O	[34]
${{\mathrm{NO}}_{2}}^{-}$+4Fe²⁺+5H₂O → N₂O+4FeOOH+6H⁺	[27]
2NO+2Fe²⁺+2H⁺ → N₂O+2Fe³⁺+H₂O	[30]
${{\mathrm{NO}}_{2}}^{-}$+有机质→硝基苯酚类→醌肟化合物→ N₂、N₂O、NO和NO₂等	[35]

化学反应方程式 Chemical reaction equation	参考文献 Reference
2${{\mathrm{NH}}_{4}}^{+}$+8FeOOH+14H⁺ → N₂O+8Fe²⁺+15H₂O	[30]
2${{\mathrm{NO}}_{3}}^{-}$+8 Fe²⁺+11H₂O → N₂O+8FeOOH+14H⁺	[27]
2${{\mathrm{NO}}_{3}}^{-}$+12 Fe²⁺+11H₂O → N₂O+4Fe₃O₄+22H⁺	[27]
2${{\mathrm{NO}}_{3}}^{-}$+FeO+2H⁺ → N₂O+4FeOOH+1/2H₂O+7/4O₂	[31]
2${{\mathrm{NO}}_{3}}^{-}$+MnO+2H⁺ → N₂O+MnO₂+3/2O₂+H₂O	[31]
2NH₂OH+4Fe³⁺ → N₂O+4Fe²⁺+H₂O+4H⁺	[32]
NH₂OH+4FeOOH+8H⁺ → N₂O+4Fe²⁺+9H₂O	[33]
2NH₂OH+2MnO₂+MnO+1/2O₂+4H⁺ → N₂O+2Mn²⁺+5H₂O	[31]
2NH₂OH+2MnO₂ → N₂O+2MnO+3H₂O	[31]
${{\mathrm{NO}}_{2}}^{-}$+H⁺ → N₂O+H₂O	[34]
${{\mathrm{NO}}_{2}}^{-}$+4Fe²⁺+5H₂O → N₂O+4FeOOH+6H⁺	[27]
2NO+2Fe²⁺+2H⁺ → N₂O+2Fe³⁺+H₂O	[30]
${{\mathrm{NO}}_{2}}^{-}$+有机质→硝基苯酚类→醌肟化合物→ N₂、N₂O、NO和NO₂等	[35]

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Study on the Core Pathways and Influencing Factors of N₂O Emission from Farmland Soils

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