Browsing by Author "Lulie Melling"

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    Carbon dioxide balance of an oil palm plantation established on tropical peat
    (Elsevier, 2020) Frankie Kiew; Ryuichi Hirata; Takashi Hirano; Wong Guan Xhuan; Edward Baran Aries; Kevin Kemudang; Joseph Wenceslaus; Lo Kim San; Lulie Melling
    Carbon dioxide (CO2) emission through accelerated peat decomposition is one of the main environmental concerns in the conversion of peatlands into plantations, which undergo drainage to increase palm growth rates and production. Changes in aboveground biomass might also significantly alter the CO2 exchange dynamics of the ecosystem. Despite the potential changes in CO2 balance due to land conversion, so far no study has been conducted using the eddy covariance technique about the CO2 balance of oil palm plantations established on peat. We have monitored the eddy CO2 flux above an oil palm plantation on peat in Sarawak, Malaysia since 2011.
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    CO2 balance of a secondary tropical peat swamp forest in Sarawak, Malaysia
    (Elsevier, 2018) Frankie Kiew; Ryuichi Hirata; Takashi Hirano; Guan Xhuan Wong; Edward Baran Aeries; Kevin Kemudang Musin; Joseph Wenceslaus Waili; Kim San Lo; Mariko Shimizue; Lulie Melling
    Through the land conversion, peat carbon has become vulnerable and potentially changes to a great carbon dioxide (CO2) source to the atmosphere. It is essential to quantify the CO2 balance of the ecosystem and understand how the CO2 balance responds to environmental changes to predict the role of PSF in global carbon cycles. However, filed studies based on the ecosystem-scale monitoring of CO2 flux are quite limited. Thus, we began CO2 flux monitoring over a secondary PSF in Sarawak, Malaysia, by the eddy covariance technique in 2010.
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    Effect of compaction on soil CO2 and CH4 fluxes from tropical peatland in Sarawak, Malaysia
    (Springer, 2021) Nur Azima Busman; Nagamitsu Maie; Che Fauziah Ishak; Muhammad Firdaus Sulaiman; Lulie Melling
    Tropical peatland stores a large amount of carbon (C) and is an important C sink. In Malaysia, about 25% of the peatland area has been converted to oil palm plantation where drainage, compaction and groundwater table control are prerequisite. To date, relationship between land compaction and C emission from tropical peatland is scarcely studied. To understand the effect of compaction on soil carbon dioxide (CO2) and methane (CH4) flux from tropical peatland, a laboratory soil column incubation was conducted.
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    How do land use practices affect methane emissions from tropical peat ecosystems?
    (Elsevier, 2020) Guan Xhuan Wong; Ryuichi Hirata; Takashi Hirano; Frankie Kiew; Edward Baran Aeries; Kevin Kemudang Musin; Joseph Wenceslaus Waili; Kim San Lo; Lulie Melling
    Wetlands in Southeast Asia are thought to be one of the greatest sources of methane (CH4) to the atmosphere. Tropical peatlands are typical in Southeast Asia, and store an enormous amount of soil organic carbon. However, chamber studies of soil CH4 flux have reported that CH4 emissions from tropical peatlands in Southeast Asia are almost negligible. Recently, it was reported that some tree species growing in peat swamp forests emit considerable CH4 from their stems. Thus, ecosystem-scale flux measurement is essential to quantify the CH4 balance of tropical peat ecosystems. In this 3-year study (February 2014 to January 2017), using the eddy covariance technique, we measured the net ecosystem exchange of CH4 (FCH4) above three different tropical peat ecosystems in Sarawak, Malaysia.
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    Micrometeorological measurement of methane flux above a tropical peat swamp forest
    (Elsevier, 2018) Guan Xhuan Wong; Ryuichi Hirata; Takashi Hirano; Frankie Kiewa; Edward Baran Aeries; Kevin Kemudang Musin; Joseph Wenceslaus Waili; Kim San Lo; Lulie Melling
    Owing to the huge soil carbon stock and high groundwater level (GWL), tropical peatlands potentially represent a significant source of methane (CH4) to the atmosphere. However, a few studies of CH4 flux by the soil chamber technique have reported that annual CH4 emissions from tropical peat swamp forest were very low as compared to mid- and high-latitude peatlands. Recently, it has been reported that some tree species growing in peat swamp forest emit CH4 from their stems. It is impossible to continuously measure ecosystem-scale CH4 flux including both soil and plant-mediated CH4 emissions by the chamber technique. Thus, we have measured net ecosystem CH4 exchange (FCH4) above a tropical peat swamp forest in Sarawak, Malaysia using the eddy covariance technique from February 2014 to July 2015 (18 months).