Non-phototrophic CO
2
fixation by soil microorganisms |
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Authors: | Anja Miltner Frank-Dieter Kopinke Reimo Kindler Draženka Selesi Anton Hartmann Matthias Kästner |
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Institution: | 1. Department of Bioremediation, UFZ – Centre for Environmental Research Leipzig-Halle, Permoserstra?e 15, 04318, Leipzig, Germany 2. Department of Environmental Technology, UFZ – Centre for Environmental Research Leipzig-Halle, Permoserstra?e 15, 04318, Leipzig, Germany 3. GSF – National Research Centre for Environment and Health, Institute of Soil Ecology, Ingolst?dter Landstra?e 1, 85764, Neuherberg, Germany
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Abstract: | Although soils are generally known to be a net source of CO2 due to microbial respiration, CO2 fixation may also be an important process. The non-phototrophic fixation of CO2 was investigated in a tracer experiment with 14CO2 in order to obtain information about the extent and the mechanisms of this process. Soils were incubated for up to 91 days
in the dark. In three independent incubation experiments, a significant transfer of radioactivity from 14CO2 to soil organic matter was observed. The process was related to microbial activity and could be enhanced by the addition
of readily available substrates such as acetate. CO2 fixation exhibited biphasic kinetics and was linearly related to respiration during the first phase of incubation (about
20–40 days). The fixation amounted to 3–5% of the net respiration. After this phase, the CO2 fixation decreased to 1–2% of the respiration. The amount of carbon fixed by an agricultural soil corresponded to 0.05% of
the organic carbon present in the soil at the beginning of the experiment, and virtually all of the fixed CO2 was converted to organic compounds. Many autotrophic and heterotrophic biochemical processes result in the fixation of CO2. However, the enhancement of the fixation by addition of readily available substrates and the linear correlation with respiration
suggested that the process is mainly driven by aerobic heterotrophic microorganisms. We conclude that heterotrophic CO2 fixation represents a significant factor of microbial activity in soils. |
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Keywords: | heterotrophic CO2 fixation mineralization non-phototrophic CO2 fixation respiration ribulosebisphosphate carboxylase soil microorganisms |
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