Biogeochemical Dynamics of Soil Redox Processes
Summary
Soil redox processes govern the transfer of electrons between minerals, organic matter and microbial communities, creating dynamic zones that oscillate between oxic and anoxic conditions. Variations in water content, oxygen diffusivity and the presence of redox-active metals such as iron and manganese drive spatially and temporally heterogeneous microsites. In aerobic zones, microorganisms oxidise organic carbon and reduced inorganic solutes, whereas in anaerobic pockets processes such as denitrification, sulphate reduction and methanogenesis prevail. Transient oxygenation events can alter mineral crystallinity and enzyme activity, shaping the fate of carbon and nutrients. Redox reactions influence soil structure, nutrient availability and greenhouse-gas emissions, with implications for carbon sequestration, water quality and climate feedbacks. Understanding these coupled abiotic and biotic mechanisms across scales—from pore to landscape—is crucial for improving models of terrestrial carbon cycling and informing land-management strategies in wetlands, uplands and agricultural systems worldwide.
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Biogeochemical Dynamics of Soil Redox Processes publication trend
The graph below shows the total number of articles in biogeochemical dynamics of soil redox processes across all publications each year (not limited to Nature Index journals).
Technical terms
Redox potential (Eh): A measure of a soil’s tendency to gain or lose electrons, indicating the balance between oxidising and reducing conditions.
Anaerobic microsite: A small zone within otherwise oxygenated soil where oxygen is depleted, allowing anaerobic microbial processes to occur.
Denitrification: A microbial process in which nitrate is sequentially reduced to gaseous nitrogen species, removing bioavailable nitrogen from soil.
Methanogenesis: The production of methane by specialised archaea under strictly anaerobic conditions, often occurring in water-saturated soils.
Fenton reaction: An abiotic redox reaction in which ferrous iron reacts with hydrogen peroxide to generate hydroxyl radicals capable of oxidising organic compounds.
References
- Reactive iron, not fungal community, drives organic carbon oxidation potential in floodplain soils. Soil Biology and Biochemistry (2023).
- Relationship between soil CO2 fluxes and soil moisture: Anaerobic sources explain fluxes at high water content. Geoderma (2023).
- Hot Spots and Hot Moments of Soil Moisture Explain Fluctuations in Iron and Carbon Cycling in a Humid Tropical Forest Soil. Soil Systems (2018).
- Transient O2 pulses direct Fe crystallinity and Fe(III)-reducer gene expression within a soil microbiome. Microbiome (2018).
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