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Carbon loss from aboveground woody debris generated through land conversion from a secondary peat swamp forest to an oil palm plantation

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Title: Carbon loss from aboveground woody debris generated through land conversion from a secondary peat swamp forest to an oil palm plantation
Authors: Hirano, Takashi Browse this author →KAKEN DB
Wong, Guan Xhuan Browse this author
Waili, Joseph Wenceslaus Browse this author
San LO, Kim Browse this author
Kiew, Frankie Browse this author
Hirata, Ryuichi Browse this author
Ishikura, Kiwamu Browse this author
Hayashi, Masato Browse this author
Murata, Shoko Browse this author
Shiraishi, Tomohiro Browse this author
Itoh, Masayuki Browse this author
Melling, Lulie Browse this author
Keywords: Apparent cross-sectional area
CO2 emissions
Decomposition rate constant (k)
Stacking row
Issue Date: Oct-2022
Publisher: 日本農業気象学会(The Society of Agricultural Meteorology of Japan)
Journal Title: Journal of agricultural meteorology
Volume: 78
Issue: 4
Start Page: 137
End Page: 146
Publisher DOI: 10.2480/agrmet.D-22-00003
Abstract: Palm oil accounts for about 40% of the global demand of vegetable oil. To meet the demand, oil palm plantations have expanded in the humid tropics at the expense of tropical forests. Land conversion begins with clear cutting and generates much woody debris, which was stacked in rows. Woody debris decomposes and emits carbon dioxide (CO2), but the time course of the decomposition is not well understood, especially at the early stage. Thus, we measured carbon (C) stock in woody debris in a newly established plantation after clear cutting of a secondary peat swamp forest in Sarawak, Malaysia. A litter bag method was applied to examine the decomposition of woody debris scattered on the ground. Also, we periodically measured apparent cross-sectional area (ACSA) of a stacking row (about 5 m wide and 90 m long) assuming that the cross-sectional form was triangular. The C stock of the stacking row was estimated from ACSA and measured C fractions using a significant sigmoidal relationship. The decomposition rate constants (k) for C content were determined to be 0.231-0.313 yr-1 for ground woody debris and 0.459 yr-1 for stacked woody debris. In addition, the total decomposition of the aboveground woody debris proceeded according to another k of 0.440 yr-1 during the experimental period of 740 days. The total C stock of aboveground woody debris was 48.4 Mg C ha-1 at the beginning of the field experiment, about 16 months after clear cutting. The C stock accounted for 63% of the C of forest aboveground biomass. Despite the uncertainty in the spatial representativeness, we think that simply measurable ACSA is useful to quantify the C stock of stacked woody debris. The technique could be applicable to large-area estimation using drone technology.
Type: article
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)

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