Browsing by Author "Edward Baran Aeries"

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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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    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).