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  Unexpected Control of Soil Carbon Turnover by Soil Carbon Concentration

Don, A., Rödenbeck, C., & Gleixner, G. (2013). Unexpected Control of Soil Carbon Turnover by Soil Carbon Concentration. Environmental Chemistry Letters, 11, 407-413. doi:10.1007/s10311-013-0433-3.

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Don, Axel1, Author           
Rödenbeck, Christian2, Author           
Gleixner, Gerd3, Author           
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1Department Biogeochemical Processes, Prof. E.-D. Schulze, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497751              
2Inverse Data-driven Estimation, Dr. C. Rödenbeck, Department Biogeochemical Systems, Prof. M. Heimann, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497785              
3Molecular Biogeochemistry Group, Dr. G. Gleixner, Department Biogeochemical Processes, Prof. S. E. Trumbore, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497775              

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 Abstract: Soils are a key component of the terrestrial carbon cycle as they contain the majority of terrestrial carbon. Soil microorganisms mainly control the accumulation and loss of this carbon. However, traditional concepts of soil carbon stabilisation failed so far to account for environmental and energetic constraints of microorganisms. Here we demonstrate for the first time that these biological limitations might have the overall control on soil carbon stability. In a long-term experiment we incubated 13C labelled compost with natural soils at various soil carbon concentrations. Unexpectedly we found that soil carbon turnover decreased with lower carbon concentration. We developed a conceptual model that explained these observations. In this model two types of particles were submitted to random walk movement in the soil profile: soil organic matter substrate and microbial decomposers. Soil carbon turnover depended only on the likelihood of a decomposer particle to meet a substrate particle; in consequence carbon turnover decreased with lower carbon concentration, like observed in the experiment. This conceptual model was able to simulate realistic depth profiles of soil carbon and soil carbon age. Our results, which are simply based on the application of a two-step kinetic, unmystify the stability of soil carbon and suggest that observations like high carbon ages in subsoil, stability of carbon in fallows and priming of soil carbon might be simply explained by the probability to be decomposed.

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 Dates: 2013-07-192013-08-292013
 Publication Status: Issued
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 Identifiers: Other: BGC1901
DOI: 10.1007/s10311-013-0433-3
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Title: Environmental Chemistry Letters
Source Genre: Journal
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Publ. Info: Berlin [u.a.] : Springer
Pages: - Volume / Issue: 11 Sequence Number: - Start / End Page: 407 - 413 Identifier: Other: 1610-3661
CoNE: https://pure.mpg.de/cone/journals/resource/1610-3661