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Factors affecting oxidative peat decomposition due to land use in tropical peat swamp forests in Indonesia.
Sci Total Environ 2017; 609:906-915ST

Abstract

The increasing frequency of fire due to drainage of tropical peatland has become a major environmental problem in Southeast Asia. To clarify the effects of changes in land use on carbon dioxide emissions, we measured oxidative peat decomposition (PD) at different stages of disturbance at three sites in Central Kalimantan, Indonesia: an undrained peat swamp forest (UF), a heavily drained peat swamp forest (DF), and a drained and burned ex-forest (DB). PD exhibited seasonality, being less in the wet season and greater in the dry season. From February 2014 to December 2015, mean PD (±SE) were 1.90±0.19, 2.30±0.33, and 1.97±0.25μmolm-2s-1 at UF, DF, and DB, respectively. The groundwater level (GWL) was a major controlling factor of PD at all sites. At UF and DF, PD and GWL showed significant quadratic relationships. At DB, PD and GWL showed significant positive and negative relationships during the dry and wet seasons, respectively. Using these relationships, we estimated annual PD from GWL data for 2014 and 2015 as 698 and 745gCm-2yr-1 at UF (mean GWL: -0.23 and -0.39m), 775 and 825gCm-2yr-1 at DF (-0.55 and -0.59m), and 646 and 748gCm-2yr-1 at DB (-0.22 and -0.62m), respectively. The annual PD was significantly higher in DF than in UF or DB, in both years. Despite the very dry conditions, the annual PD values at these sites were much lower than those reported for tropical peat at plantations (e.g., oil palm, rubber, and acacia). The differences in the relationship between PD and GWL indicate that separate estimations are required for each type of land. Moreover, our results suggest that PD can be enhanced by drainage both in forests and at burned sites.

Authors+Show Affiliations

Center for Southeast Asian Studies, Kyoto University, Kyoto 606-8501, Japan. Electronic address: itoma@cseas.kyoto-u.ac.jp.Research Faculty of Agriculture, Hokkaido University, Sapporo 060-8589, Japan.Research Faculty of Agriculture, Hokkaido University, Sapporo 060-8589, Japan.CIMTROP, University of Palangkaraya, Palangkaraya, 73112, Indonesia.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

28783903

Citation

Itoh, Masayuki, et al. "Factors Affecting Oxidative Peat Decomposition Due to Land Use in Tropical Peat Swamp Forests in Indonesia." The Science of the Total Environment, vol. 609, 2017, pp. 906-915.
Itoh M, Okimoto Y, Hirano T, et al. Factors affecting oxidative peat decomposition due to land use in tropical peat swamp forests in Indonesia. Sci Total Environ. 2017;609:906-915.
Itoh, M., Okimoto, Y., Hirano, T., & Kusin, K. (2017). Factors affecting oxidative peat decomposition due to land use in tropical peat swamp forests in Indonesia. The Science of the Total Environment, 609, pp. 906-915. doi:10.1016/j.scitotenv.2017.07.132.
Itoh M, et al. Factors Affecting Oxidative Peat Decomposition Due to Land Use in Tropical Peat Swamp Forests in Indonesia. Sci Total Environ. 2017 Dec 31;609:906-915. PubMed PMID: 28783903.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Factors affecting oxidative peat decomposition due to land use in tropical peat swamp forests in Indonesia. AU - Itoh,Masayuki, AU - Okimoto,Yosuke, AU - Hirano,Takashi, AU - Kusin,Kitso, Y1 - 2017/08/07/ PY - 2017/04/20/received PY - 2017/07/13/revised PY - 2017/07/14/accepted PY - 2017/8/9/pubmed PY - 2017/8/9/medline PY - 2017/8/9/entrez KW - Drainage KW - Land-use change KW - Oxidative peat decomposition KW - Trenching KW - Tropical peat SP - 906 EP - 915 JF - The Science of the total environment JO - Sci. Total Environ. VL - 609 N2 - The increasing frequency of fire due to drainage of tropical peatland has become a major environmental problem in Southeast Asia. To clarify the effects of changes in land use on carbon dioxide emissions, we measured oxidative peat decomposition (PD) at different stages of disturbance at three sites in Central Kalimantan, Indonesia: an undrained peat swamp forest (UF), a heavily drained peat swamp forest (DF), and a drained and burned ex-forest (DB). PD exhibited seasonality, being less in the wet season and greater in the dry season. From February 2014 to December 2015, mean PD (±SE) were 1.90±0.19, 2.30±0.33, and 1.97±0.25μmolm-2s-1 at UF, DF, and DB, respectively. The groundwater level (GWL) was a major controlling factor of PD at all sites. At UF and DF, PD and GWL showed significant quadratic relationships. At DB, PD and GWL showed significant positive and negative relationships during the dry and wet seasons, respectively. Using these relationships, we estimated annual PD from GWL data for 2014 and 2015 as 698 and 745gCm-2yr-1 at UF (mean GWL: -0.23 and -0.39m), 775 and 825gCm-2yr-1 at DF (-0.55 and -0.59m), and 646 and 748gCm-2yr-1 at DB (-0.22 and -0.62m), respectively. The annual PD was significantly higher in DF than in UF or DB, in both years. Despite the very dry conditions, the annual PD values at these sites were much lower than those reported for tropical peat at plantations (e.g., oil palm, rubber, and acacia). The differences in the relationship between PD and GWL indicate that separate estimations are required for each type of land. Moreover, our results suggest that PD can be enhanced by drainage both in forests and at burned sites. SN - 1879-1026 UR - https://www.unboundmedicine.com/medline/citation/28783903/Factors_affecting_oxidative_peat_decomposition_due_to_land_use_in_tropical_peat_swamp_forests_in_Indonesia_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0048-9697(17)31835-1 DB - PRIME DP - Unbound Medicine ER -