Soil Emissions Dynamics Under Elevated Atmospheric CO2
Summary
Rising atmospheric CO2 concentrations alter soil greenhouse-gas exchange by stimulating plant growth and modifying microbial processes. Enhanced photosynthesis under elevated CO2 increases rhizodeposition, supplying additional organic substrates to soil microbes. This in turn accelerates soil respiration, nitrification, denitrification and methanogenesis, often leading to higher CO2, N2O and CH4 emissions. Interactive effects of warming, altered precipitation and nitrogen availability further modulate these responses, sometimes synergistically reinforcing gas fluxes. The net impact varies among ecosystems—croplands, grasslands, forests and paddy fields—reflecting differences in soil type, nutrient status and plant community. Understanding these dynamics is crucial for predicting climate feedbacks and developing mitigation strategies, such as optimised fertilisation or water management, to curb soil-borne emissions under future CO2 scenarios.
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Soil Emissions Dynamics Under Elevated Atmospheric CO2 publication trend
The graph below shows the total number of articles in soil emissions dynamics under elevated atmospheric co2 across all publications each year (not limited to Nature Index journals).
Technical terms
Free-air CO2 enrichment (FACE): A field experiment technique that raises ambient CO2 levels around plants without enclosing them, to study ecological responses.
Nitrification: Microbial oxidation of ammonium (NH4+) to nitrate (NO3–), releasing nitrous oxide (N2O) as a by-product.
Denitrification: Microbial reduction of nitrate (NO3–) to nitrogen gases (N2O, N2) under low-oxygen conditions, contributing to N2O emissions.
Methanogenesis: Anaerobic microbial process in which archaea produce methane (CH4) from substrates such as acetate and hydrogen.
Rhizodeposition: Release of organic compounds by plant roots into the soil, serving as energy sources for microbial communities.
References
- Nitrification, denitrification, and related functional genes under elevated CO2: A meta‐analysis in terrestrial ecosystems. Global Change Biology (2023).
- Impacts of Elevated Atmospheric CO2 and N Fertilization on N2O Emissions and Dynamics of Associated Soil Labile C Components and Mineral N in a Maize Field in the North China Plain. Agronomy (2022).
- Effects of free-air CO2 enrichment (FACE) and soil warming on CH4 emission from a rice paddy field: impact assessment and stoichiometric evaluation. Biogeosciences (2010).
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