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| Titel |
Tree-mediated methane emissions along a tropical peat dome |
| VerfasserIn |
Sunitha Pangala, Alison Hoyt, Alex Cobb, Charles Harvey, Vincent Gauci |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250150097
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| Publikation (Nr.) |
 EGU/EGU2017-14523.pdf |
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| Zusammenfassung |
| Methane production and transport processes in peatlands are fairly well understood, but
growing evidence for emission of methane through trees has highlighted the need to revisit
methane transport processes. We examined methane emissions from all pathways including
stem and leaf emissions in one of the last remaining pristine tropical peatlands in
Southeast Asia: Belait peat swamp forests, Brunei Darussalam. Methane emissions
along with a range of biotic and abiotic factors were measured within three 20 x
30 m plots along transects from the edge to the center of the peat done which is
dominated by Shorea albida. Tree-mediated methane emissions were the dominant
means of methane emissions from all three plots, with soil emissions equating to less
than 30% of the total ecosystem methane flux. Both tree and soil emissions varied
between and within the three plots, with soil emissions decreasing from the edge to the
center of the peat dome with increasing peat depth and decreasing water table depths
and tree emissions following an opposite trend. Within each plot, tree-mediated
methane emissions displayed large variability with fluxes ranging between 0.2 –
9.4 mg m−2 hr−1. Relationships between tree-mediated methane emissions and
pore-water methane concentrations point towards the possibility of some of these
trees transporting methane produced in the deeper layers of the peat profile to the
atmosphere. Taken together, these observations highlight that methane emissions
through tree stems play a more central role in methane cycling in tropical peatlands. |
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