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Soil carbon dioxide emissions due to oxidative peat decomposition in an oil palm plantation on tropical peat

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Title: Soil carbon dioxide emissions due to oxidative peat decomposition in an oil palm plantation on tropical peat
Authors: Ishikura, Kiwamu Browse this author
Hirano, Takashi Browse this author →KAKEN DB
Okimoto, Yosuke Browse this author
Hirata, Ryuichi Browse this author
Kiew, Frankie Browse this author
Melling, Lulie Browse this author
Aeries, Edward Baran Browse this author
Lo, Kim San Browse this author
Musin, Kevin Kemudang Browse this author
Waili, Joseph Wenceslaus Browse this author
Wong, Guan Xhuan Browse this author
Ishii, Yoshiyuki Browse this author →KAKEN DB
Keywords: Automated chamber system
Carbon dioxide efflux
Groundwater level
Heterotrophic respiration
Soil respiration
Issue Date: 15-Feb-2018
Publisher: Elsevier
Journal Title: Agriculture, ecosystems & environment
Volume: 254
Start Page: 202
End Page: 212
Publisher DOI: 10.1016/j.agee.2017.11.025
Abstract: Soil carbon dioxide (CO₂) efflux was measured continuously for two years using an automated chamber system in an oil palm plantation on tropical peat. This study investigated the factors controlling the CO₂ efflux and quantified the annual cumulative CO₂ emissions through soil respiration and heterotrophic respiration, which is equivalent to oxidative peat decomposition. Soil respiration was measured in close-to-tree (< 2.5 m, CT) and far from-tree (> 3 m, FT) plots, and heterotrophic respiration was measured in root-cut (RC) plots by a trenching method. The daily mean CO2 efflux values (mean ±1 standard deviation) were 2.80±2.18, 1.59±1.18, and 1.94±1.581 μmol m⁻² s⁻¹ in the CT, FT, and RC plots, respectively. Daily mean CO₂ efflux increased exponentially as the groundwater level or water-filled pore space decreased, indicating that oxidative peat decomposition and gas diffusion in the soil increased due to enhanced aeration resulting from lower groundwater levels. Mean annual gap-filled CO₂ emissions were 1.03 ± 0.53, 0.59 ± 0.26, and 0.69 ± 0.21 kg C m⁻² yr⁻¹ in the CT, FT, and RC plots, respectively. Soil CO₂ emissions were significantly higher in the CT plots (P < 0.05), but did not differ significantly between the FT and RC plots. This implies that root respiration was negligible in the FT plots. Heterotrophic respiration accounted for 66% of soil respiration. Annual CO₂ emissions through both soil and heterotrophic respiration were smaller than those of other oil palm plantations on tropical peat, possibly due to the higher groundwater levels, land compaction, and continuous measurement of soil CO₂ efflux in this study. Mean annual total subsidence was 1.55 to 1.62 cm yr⁻¹, of which oxidative peat decomposition accounted for 72 to 74%. In conclusion, water management to raise groundwater levels would mitigate soil CO₂ emissions from oil palm plantations on tropical peatland.
Rights: © 2017 Elsevier B.V. All rights reserved. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
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: 石倉 究

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