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| Titel |
Nitrous oxide fluxes from tropical peat with different disturbance history and management |
| VerfasserIn |
J. Jauhiainen, H. Silvennoinen, R. Hämäläinen, K. Kusin, S. Limin, R. J. Raison, H. Vasander |
| 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 ; 9, no. 4 ; Nr. 9, no. 4 (2012-04-12), S.1337-1350 |
| Datensatznummer |
250006946
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| Publikation (Nr.) |
 copernicus.org/bg-9-1337-2012.pdf |
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| Zusammenfassung |
Tropical peatlands are one of the most important terrestrial ecosystems in
terms of impact on the atmospheric greenhouse gas composition. Currently,
greenhouse gas emissions from tropical peatlands following disturbances due
to deforestation, drainage or wildfire are substantial. We quantified in situ
nitrous oxide (N2O) fluxes during both dry and wet seasons using a
closed chamber method at sites that represented differing land uses and land
use change intensities in Central Kalimantan, Indonesia. Cumulative N2O
fluxes were compared with carbon dioxide (CO2) and methane (CH4)
fluxes.
The mean N2O flux rates (N2O-N ±: SD, mg m−2 h−1)
varied as follows: drained forest (0.112 ± 0.293) > agricultural peat
at the Kalampangan site (0.012 ± 0.026) > drained burned peat
(0.011 ± 0.018) > agricultural peat at the Marang site (0.0072 ± 0.028) >
undrained forest (0.0025 ± 0.053) > clear-felled, drained,
recovering forest (0.0022 ± 0.021). The widest N2O flux range was
detected in the drained forest (max. 2.312 and
min. −0.043 mg N2O-N m−2 h−1). At the other flux monitoring sites the flux ranges
remained at about one tenth that of the drained forest site. The highest
N2O emission rates were observed at water tables close to the peat
surface where also the flux range was widest. Annual cumulative peat
surface N2O emissions (expressed in CO2 equivalents as a
percentage of the total greenhouse gas (N2O, CO2 and CH4)
emissions) were 9.2 % at highest, but typically ~1 %. Average
N2O fluxes and also the total of monitored GHG emissions were highest
in drainage-affected forest which is characterized by continuous labile
nitrogen availability from vegetation, and water tables typically below the
surface. |
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