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A new model for soil organic carbon turnover using bomb carbon

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons62394

Hahn,  V.
Research Group Biodiversity Ecosystem, Dr. N. Buchmann, Max Planck Institute for Biogeochemistry, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons62349

Buchmann,  N.
Research Group Biodiversity Ecosystem, Dr. N. Buchmann, Max Planck Institute for Biogeochemistry, Max Planck Society;

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Hahn, V., & Buchmann, N. (2004). A new model for soil organic carbon turnover using bomb carbon. Global Biogeochemical Cycles, 18(1), GB1019. doi:10.1029/2003GB002115.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000E-D1A3-6
Abstract
A new model is presented that uses bomb carbon (C-14 enrichment) to calculate the turnover times of active soil organic carbon (SOC). The new approach overcomes major deficiencies of older models, particularly in respect to the C-14 content of carbon input to SOC and of carbon output from SOC. Calculated turnover times of active carbon for ten European forest sites ranged from 4.0 to 15.1 years with a mean of 8.2 years. The model was successfully validated in soil incubation experiments, where the measured (14C) content of (microbially) respired CO2 was on average 9.6% (DeltapM) higher than that of bulk SOC, but agreed considerably well with the modeled C-14 content. Furthermore, we used the model's sensitivity tests to show that over long time periods (decades), soils can only sequester small amounts of carbon. [References: 29]