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| Titel |
C loss of managed peatlands along a land use gradient – a comparison of three different methods |
| VerfasserIn |
Jan Paul Krüger, Jens Leifeld, Stephan Glatzel, Christine Alewell |
| 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 |
250104009
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| Publikation (Nr.) |
 EGU/EGU2015-3431.pdf |
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| Zusammenfassung |
| Carbon (C) loss from managed organic soils is an important flux in the global carbon cycle.
Different approaches exist to estimate C emissions and thus the greenhouse gas balance of
soils. Here we compare two soil profile-based methods with greenhouse gas flux
measurements by closed chambers to assess the net C loss from managed peatlands. We
applied the different methods to the well-studied peatland complex Ahlen-Falkenberger Moor
in northern Germany, which represents a land use gradient from near-natural wetland (NW)
to extensively used grassland (GE) (rewetted in 2003/2004) to intensively used grassland
(GI). Drainage commenced at the beginning of the 20th century, and land use was intensified
in the middle of the 20th century. In November 2012, three peat cores down to approximately
100 cm were taken at each site and various biogeochemical soil parameters were analysed.
The so-called combined method estimates the physical primary subsidence due to the
loss of pore water and peat shrinkage, and the secondary subsidence due to the
oxidative loss of organic matter. As a second method C loss was calculated using
peat accumulation rates derived from 14-C age-dated samples and their C-stock
in this depth. These two profile-based methods give the C loss since the onset of
drainage. Compared to this, the greenhouse gas (GHG) measurements (2007-2009)
represent the current C loss from the soil under given climate and management
conditions.
All three sites have lost C since the onset of drainage in the order NW |
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