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| Titel |
Annual carbon balance of a peatland 10 yr following restoration |
| VerfasserIn |
M. Strack, Y. C. A. Zuback |
| 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 ; 10, no. 5 ; Nr. 10, no. 5 (2013-05-02), S.2885-2896 |
| Datensatznummer |
250018227
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| Publikation (Nr.) |
 copernicus.org/bg-10-2885-2013.pdf |
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| Zusammenfassung |
| Undisturbed peatlands represent long-term net sinks of carbon; however, peat
extraction converts these systems into large and persistent sources of
greenhouse gases. Although rewetting and restoration following peat
extraction have taken place over the last several decades, very few studies
have investigated the longer term impact of this restoration on peatland
carbon balance. We determined the annual carbon balance of a former
horticulturally-extracted peatland restored 10 yr prior to the study and
compared these values to the carbon balance measured at neighboring
unrestored and natural sites. Carbon dioxide (CO2) and methane
(CH4) fluxes were measured using the chamber technique biweekly during
the growing season from May to October 2010 and three times over the winter
period. Dissolved organic carbon (DOC) export was measured from remnant
ditches in the unrestored and restored sites. During the growing season the
restored site had greater uptake of CO2 than the natural site when
photon flux density was greater than 1000 μmol m−2 s−1,
while the unrestored site remained a source of CO2. Ecosystem
respiration was similar between natural and restored sites, which were both
significantly lower than the unrestored site. Methane flux remained low at
the restored site except from open water pools, created as part of
restoration, and remnant ditches. Export of DOC during the growing season
was 5.0 and 28.8 g m−2 from the restored and unrestored sites,
respectively. Due to dry conditions during the study year all sites acted as
net carbon sources with annual balance of the natural, restored and
unrestored sites of 250.7, 148.0 and 546.6 g C m−2, respectively.
Although hydrological conditions and vegetation community at the restored
site remained intermediate between natural and unrestored conditions,
peatland restoration resulted in a large reduction in annual carbon loss
from the system resulting in a carbon balance more similar to a natural
peatland. |
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