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Carbon dioxide emissions through oxidative peat decomposition on a burnt tropical peatland

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Title: Carbon dioxide emissions through oxidative peat decomposition on a burnt tropical peatland
Authors: Hirano, Takashi Browse this author →KAKEN DB
Kusin, Kitso Browse this author
Limin, Suwido Browse this author
Osaki, Mitsuru Browse this author
Keywords: carbon balance
chamber technique
ecosystem respiration
peat fire
heterotrophic respiration
groundwater level
peat oxidation
peat swamp forest
soil temperature
Southeast Asia
Issue Date: Feb-2014
Publisher: Wiley-Blackwell Publishing
Journal Title: Global Change Biology
Volume: 20
Issue: 2
Start Page: 555
End Page: 565
Publisher DOI: 10.1111/gcb.12296
PMID: 23775585
Abstract: Abstract In Southeast Asia, a huge amount of peat has accumulated under swamp forests over millennia. Fires have been widely used for land clearing after timber extraction, thus land conversion and land management with logging and drainage are strongly associated with fire activity. During recent El Niño years, tropical peatlands have been severely fire-affected and peatland fires enlarged. To investigate the impact of peat fires on the regional and global carbon balances, it is crucial to assess not only direct carbon emissions through peat combustion but also oxidative peat decomposition after fires. However, there is little information on the carbon dynamics of tropical peat damaged by fires. Therefore, we continuously measured soil CO2 efflux (RP) through oxidative peat decomposition using six automated chambers on a burnt peat area, from which about 0.7 m of the upper peat had been lost during two fires, in Central Kalimantan, Indonesia. The RP showed a clear seasonal variation with higher values in the dry season. The RP increased logarithmically as groundwater level (GWL) lowered. Temperature sensitivity or Q10 of RP decreased as GWL lowered, mainly because the vertical distribution of RP would shift downward with the expansion of an unsaturated soil zone. Although soil temperature at the burnt open area was higher than that in a near peat swamp forest, model simulation suggests that the effect of temperature rise on RP is small. Annual gap-filled RP was 382±82 (the mean ± one standard deviation of six chambers) and 362±74 gC m-2 y-1 in 2004-2005 and 2005-2006 years, respectively. Simulated RP showed a significant negative relationship with GWL on an annual basis, which suggests that every GWL lowering by 0.1 m causes additional RP of 89 gC m-2 y-1. The RP accounted for 21-24% of ecosystem respiration on an annual basis.
Rights: This is the peer reviewed version of the following article: [Global Change Biology 2014 Feb;20(2):555-565], which has been published in final form at [10.1111/gcb.12296]. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
Type: article (author version)
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 平野 高司

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