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  Soils apart from equilibrium - consequences for soil carbon balance modelling

Wutzler, T., & Reichstein, M. (2007). Soils apart from equilibrium - consequences for soil carbon balance modelling. Biogeosciences, 4(1), 125-136. doi:10.5194/bg-4-125-2007.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000E-D618-7 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-6218-1
Genre: Journal Article

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http://dx.doi.org/10.5194/bg-4-125-2007 (Publisher version)
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Wutzler, T.1, Author              
Reichstein, M.1, Author              
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1Research Group Biogeochemical Model-data Integration, Dr. M. Reichstein, Max Planck Institute for Biogeochemistry, Max Planck Society, escidoc:1497760              

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Free keywords: Organic-matter dynamics Land-use history Forest soils Litter decomposition Ecosystem properties European forests Picea-abies Island area Nitrogen Climate
 Abstract: Many projections of the soil carbon sink or source are based on kinetically defined carbon pool models. Parameters of these models are often determined in a way that the steady state of the model matches observed carbon stocks. The underlying simplifying assumption is that observed carbon stocks are near equilibrium. This assumption is challenged by observations of very old soils that do still accumulate carbon. In this modelling study we explored the consequences of the case where soils are apart from equilibrium. Calculation of equilibrium states of soils that are currently accumulating small amounts of carbon were performed using the Yasso model. It was found that already very small current accumulation rates cause big changes in theoretical equilibrium stocks, which can virtually approach infinity. We conclude that soils that have been disturbed several centuries ago are not in equilibrium but in a transient state because of the slowly ongoing accumulation of the slowest pool. A first consequence is that model calibrations to current carbon stocks that assume equilibrium state, overestimate the decay rate of the slowest pool. A second consequence is that spin-up runs (simulations until equilibrium) overestimate stocks of recently disturbed sites. In order to account for these consequences, we propose a transient correction. This correction prescribes a lower decay rate of the slowest pool and accounts for disturbances in the past by decreasing the spin-up-run predicted stocks to match an independent estimate of current soil carbon stocks. Application of this transient correction at a Central European beech forest site with a typical disturbance history resulted in an additional carbon fixation of 5.7 +/- 1.5 tC/ha within 100 years. Carbon storage capacity of disturbed forest soils is potentially much higher than currently assumed. Simulations that do not adequately account for the transient state of soil carbon stocks neglect a considerable amount of current carbon accumulation. [References: 62]

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 Dates: 2007
 Publication Status: Published in print
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 Identifiers: Other: BGC0946
DOI: 10.5194/bg-4-125-2007
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Title: Biogeosciences
Source Genre: Journal
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Publ. Info: Katlenburg-Lindau, Germany : Copernicus GmbH on behalf of the European Geosciences Union
Pages: - Volume / Issue: 4 (1) Sequence Number: - Start / End Page: 125 - 136 Identifier: CoNE: http://pubman.mpdl.mpg.de/cone/journals/resource/111087929276006
ISSN: 1726-4170