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| Titel |
PEATBOG: a biogeochemical model for analyzing coupled carbon and nitrogen dynamics in northern peatlands |
| VerfasserIn |
Y. Wu, C. Blodau |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 6, no. 4 ; Nr. 6, no. 4 (2013-08-09), S.1173-1207 |
| Datensatznummer |
250084971
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| Publikation (Nr.) |
 copernicus.org/gmd-6-1173-2013.pdf |
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| Zusammenfassung |
| Elevated nitrogen deposition and climate change alter
the vegetation communities and carbon (C) and nitrogen (N) cycling in
peatlands. To address this issue we developed a new process-oriented
biogeochemical model (PEATBOG) for analyzing coupled carbon and nitrogen
dynamics in northern peatlands. The model consists of four submodels, which
simulate: (1) daily water table depth and depth profiles of soil moisture,
temperature and oxygen levels; (2) competition among three plants functional
types (PFTs), production and litter production of plants; (3) decomposition
of peat; and (4) production, consumption, diffusion and export of dissolved C
and N species in soil water. The model is novel in the integration of the C
and N cycles, the explicit spatial resolution belowground, the consistent
conceptualization of movement of water and solutes, the incorporation of
stoichiometric controls on elemental fluxes and a consistent
conceptualization of C and N reactivity in vegetation and soil organic
matter. The model was evaluated for the Mer Bleue Bog, near Ottawa, Ontario,
with regards to simulation of soil moisture and temperature and the most
important processes in the C and N cycles. Model sensitivity was tested for
nitrogen input, precipitation, and temperature, and the choices of the most
uncertain parameters were justified. A simulation of nitrogen deposition over
40 yr demonstrates the advantages of the PEATBOG model in tracking
biogeochemical effects and vegetation change in the ecosystem. |
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