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| Titel |
Modelling alternative states of an ombrotrophic bog with experimentally deposed nitrogen |
| VerfasserIn |
Yuanqiao Wu, Philipp Keller, Christian Blodau |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250110424
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| Publikation (Nr.) |
 EGU/EGU2015-10419.pdf |
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| Zusammenfassung |
| Nitrogen (N) pollution of peatlands alters their vegetation composition and carbon (C)
sequestration. We applied a coupled carbon and nitrogen wetland model (PEATBOG) to
analyse alternative steady states of an ombrotrophic bog exposed to experimentally deposited
N at 1.6, 3.2 and 6.4 gN m-2 yr-1. The study predicted discontinuous responses of the
peatland ecosystem to differing N deposition and a lack of recovery after 15 years of
fertilization with 6.4 gN m-2 yr-1, which indicated a regime shift of the modelled ecosystem.
In combination drought, as concurrent disturbance, reduced the resilience of the system and
contributed to the regime shift. Internal feedbacks may interact with the direct feedback of the
external disturbances from nitrogen and climatic drivers and alter the responses of the
ecosystem. The result suggested that the state of a peatland exposed to N deposition
may be highly uncertain due to a dominant feedback loop that emerged from all
disturbances. The finding highlighted the need for systematically quantifying the
relative importance of multiple disturbances to predict the potential shift of a peatland
ecosystem to alternative states as response to N deposition in a changing environment. |
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