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Updated: Jul 11, 2026
11:19
Measuring Carbon-based Contaminant Mineralization Using Combined CO2 Flux and Radiocarbon Analyses
Published on: October 21, 2016
Carbon monoxide metabolism in roadside soils
1School of Biology, Georgia Institute of Technology, Atlanta, Georgia 30332.
Applied and Environmental Microbiology
|May 1, 1981
Summary
Soil microbes significantly boost carbon monoxide (CO) oxidation after exposure to high CO levels. This microbial adaptation enhances CO conversion to carbon dioxide (CO2), impacting soil ecosystems.
Area of Science:
- Environmental Microbiology
- Biogeochemistry
- Soil Science
Background:
- Soils play a crucial role in atmospheric gas exchange.
- Microbial communities in soil are known to metabolize various compounds, including carbon monoxide (CO).
- Understanding the factors influencing microbial CO oxidation is vital for soil ecosystem functioning.
Purpose of the Study:
- To investigate the impact of soil moisture and prior CO exposure on carbon monoxide (CO) oxidation rates.
- To explore the microbial adaptation and activity in response to varying CO concentrations.
- To determine the relationship between CO oxidation and carbon dioxide (CO2) assimilation in soil.
Main Methods:
- Soils were air-dried and equilibrated at different relative humidities or moistened with liquid water.
- CO oxidation rates were measured under varying moisture conditions and CO concentrations.
- Microbial activity was assessed through CO oxidation and CO2 assimilation measurements.
- Long-term storage and incubation experiments were conducted to evaluate microbial response.
Main Results:
- High relative humidity (>93%) and liquid water increased soil CO oxidation capacity.
- Excessive water saturation reduced CO oxidation rates due to limited CO diffusion.
- Stored soil showed decreased CO oxidation, but subsequent incubation with elevated CO significantly enhanced it.
- A positive correlation was observed between CO oxidative activity and prior exposure to high CO levels.
Conclusions:
- Soil moisture content critically affects microbial carbon monoxide (CO) oxidation rates.
- Microbial communities in soil demonstrate adaptive responses to increased carbon monoxide (CO) levels.
- CO oxidation by soil microorganisms can drive carbon dioxide (CO2) assimilation, suggesting a significant biogeochemical role for carboxydobacteria.
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