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| Titel |
Integrating microbial physiology and physio-chemical principles in soils with the MIcrobial-MIneral Carbon Stabilization (MIMICS) model |
| VerfasserIn |
W. R. Wieder, A. S. Grandy, C. M. Kallenbach, G. B. Bonan |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 11, no. 14 ; Nr. 11, no. 14 (2014-07-24), S.3899-3917 |
| Datensatznummer |
250117525
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| Publikation (Nr.) |
 copernicus.org/bg-11-3899-2014.pdf |
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| Zusammenfassung |
| A growing body of literature documents the pressing need to develop soil
biogeochemistry models that more accurately reflect contemporary
understanding of soil processes and better capture soil carbon (C) responses
to environmental perturbations. Models that explicitly represent microbial
activity offer inroads to improve representations of soil biogeochemical
processes, but have yet to consider relationships between litter quality,
functional differences in microbial physiology, and the physical protection
of microbial byproducts in forming stable soil organic matter (SOM). To
address these limitations, we introduce the MIcrobial-MIneral Carbon
Stabilization (MIMICS) model, and evaluate it by comparing site-level soil C
projections with observations from a long-term litter decomposition study and
soil warming experiment. In MIMICS, the turnover of litter and SOM pools is
governed by temperature-sensitive Michaelis–Menten kinetics and the activity
of two physiologically distinct microbial functional types. The production of
microbial residues through microbial turnover provides inputs to SOM pools
that are considered physically or chemically protected. Soil clay content
determines the physical protection of SOM in different soil environments.
MIMICS adequately simulates the mean rate of leaf litter decomposition
observed at temperate and boreal forest sites, and captures observed effects
of litter quality on decomposition rates. Moreover, MIMICS better captures
the response of SOM pools to experimental warming, with rapid SOM losses but
declining temperature sensitivity to long-term warming, compared
with a more conventional
model structure. MIMICS incorporates current microbial theory to explore the
mechanisms by which litter C is converted to stable SOM, and to improve
predictions of soil C responses to environmental change. |
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