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| Titel |
Effects of warming on CO2, N2O and CH4 fluxes and underlying processes from subarctic tundra, Northwest Russia |
| VerfasserIn |
Carolina Voigt, Richard E. Lamprecht, Maija E. Marushchak, Christina Biasi, Pertti J. Martikainen |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250094443
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| Publikation (Nr.) |
 EGU/EGU2014-9850.pdf |
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| Zusammenfassung |
| Peatlands, especially those located in the highly sensitive arctic and subarctic latitudes, are
known to play a major role in the global carbon cycle. Predicted climatic changes – entailing
an increase in near-surface temperature and a change in precipitation patterns – will most
likely have a serious yet uncertain impact on the greenhouse gas (GHG) balance of these
ecosystems. Microbial processes are enhanced by warmer temperatures which may lead to
increased trace gas fluxes to the atmosphere. However, the response of ecosystem processes
and related GHG fluxes may differ largely across the landscape depending on soil type,
vegetation cover, and moisture conditions.
In this study we investigate how temperature increase potentially reflects on GHG fluxes
(CO2, CH4 and N2O) from various tundra surfaces in the Russian Arctic. These surfaces
include raised peat plateau complexes, mineral tundra soils, bare surfaces affected by
frost action such as peat circles and thermokarst lake walls, as well as wetlands.
Predicted temperature increase and climate change effects are simulated by means of
open top chambers (OTCs), which are placed on different soil types for the whole
snow-free period. GHG fluxes, gas and nutrient concentrations in the soil profile, as
well as supporting environmental parameters are monitored for the full growing
season.
Aim of the study is not only the quantification of aboveground GHG fluxes from the study
area, but the linking of those to underlying biogeochemical processes in permafrost soils.
Special emphasis is placed on the interface between active layer and old permafrost and its
response to warming, since little is known about the lability of old carbon stocks made
available through an increase in active layer depth. Overall goal of the study is to
gain a better understanding of C and N cycling in subarctic tundra soils and to
deepen knowledge in respect to carbon-permafrost feedbacks in respect to climate. |
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