the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Reviews and syntheses: Contribution of sulfate to methane oxidation in upland soils: a mini-review
Abstract. Methane (CH4) is a potent greenhouse gas, its global warming potential is 25 times higher than carbon dioxide (CO2), and various environmental factors influence CH4 oxidation in soil. Sulfate (SO42-) ion is the main component of atmospheric deposition and has been increasing in recent years, it promotes CH4 production and anaerobic CH4 oxidation, however, the impact of SO42- on CH4 oxidation remains inconclusive. Due to the limited research on the effects of SO42- on CH4 oxidation, we synthesize current research on the effects of SO42- on CH4 oxidation, examining both its direct impact and its influence on the dynamics of soil substances, and the potential indirect effects of SO42- on CH4 oxidation. Through a literature review, we identified that SO42- facilitates CH4 oxidation within a range of 3–42 %, moreover, it has been found that various physicochemical properties and processes in the soil are influenced by the addition of SO42-, which in turn affects CH4 oxidation. This review enhances our understanding of the role of SO42- in promoting CH4 oxidation and lays the foundation for future studies aimed at validating these findings by quantifying CH4 flux and oxidation rates, as well as elucidating the underlying microbial processes via experimental research. This review deepens the comprehension of atmospheric CH4 flux and the global CH4 cycle, particularly in the context of potential global environmental changes.
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