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Carbon dioxide emissions through oxidative peat decomposition on a burnt tropical peatland.
Glob Chang Biol 2014; 20(2):555-65GC

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 [peat respiration (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 ± 1 SD of six chambers) and 362 ± 74 gC m(-2) yr(-1) during 2004-2005 and during 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) yr(-1) . The RP accounted for 21-24% of ecosystem respiration on an annual basis.

Authors+Show Affiliations

Research Faculty of Agriculture, Hokkaido University, Sapporo, 060-8589, Japan.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

23775585

Citation

Hirano, Takashi, et al. "Carbon Dioxide Emissions Through Oxidative Peat Decomposition On a Burnt Tropical Peatland." Global Change Biology, vol. 20, no. 2, 2014, pp. 555-65.
Hirano T, Kusin K, Limin S, et al. Carbon dioxide emissions through oxidative peat decomposition on a burnt tropical peatland. Glob Chang Biol. 2014;20(2):555-65.
Hirano, T., Kusin, K., Limin, S., & Osaki, M. (2014). Carbon dioxide emissions through oxidative peat decomposition on a burnt tropical peatland. Global Change Biology, 20(2), pp. 555-65. doi:10.1111/gcb.12296.
Hirano T, et al. Carbon Dioxide Emissions Through Oxidative Peat Decomposition On a Burnt Tropical Peatland. Glob Chang Biol. 2014;20(2):555-65. PubMed PMID: 23775585.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Carbon dioxide emissions through oxidative peat decomposition on a burnt tropical peatland. AU - Hirano,Takashi, AU - Kusin,Kitso, AU - Limin,Suwido, AU - Osaki,Mitsuru, Y1 - 2013/10/10/ PY - 2013/01/21/received PY - 2013/05/17/accepted PY - 2013/6/19/entrez PY - 2013/6/19/pubmed PY - 2014/9/11/medline KW - Southeast Asia KW - carbon balance KW - chamber technique KW - ecosystem respiration KW - groundwater level KW - heterotrophic respiration KW - peat fire KW - peat oxidation KW - peat swamp forest KW - soil temperature SP - 555 EP - 65 JF - Global change biology JO - Glob Chang Biol VL - 20 IS - 2 N2 - 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 [peat respiration (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 ± 1 SD of six chambers) and 362 ± 74 gC m(-2) yr(-1) during 2004-2005 and during 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) yr(-1) . The RP accounted for 21-24% of ecosystem respiration on an annual basis. SN - 1365-2486 UR - https://www.unboundmedicine.com/medline/citation/23775585/Carbon_dioxide_emissions_through_oxidative_peat_decomposition_on_a_burnt_tropical_peatland_ L2 - https://doi.org/10.1111/gcb.12296 DB - PRIME DP - Unbound Medicine ER -