首页|Variability in methane emissions from stems and buttress roots of Bruguiera gymnorrhiza trees in a subtropical mangrove forest

Variability in methane emissions from stems and buttress roots of Bruguiera gymnorrhiza trees in a subtropical mangrove forest

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Trees in wetlands emit a significant amount of methane (CH_4) into the atmosphere which is produced in the soil where anaerobic conditions prevail. However, only very few studies have considered the role of trees in the CH_4 budget of mangrove forests. How tree CH_4 emissions (FCH_4 ) vary between and within individuals, and how these emissions vary with the day/night alternation and the tidal cycle, have not yet been elucidated. We measured FCH_4 from buttress roots and stems on individuals of Bruguiera gymnorrhiza of different sizes. We also measured FCH_4 from trees and sediments over a 24-h cycle. Higher FCH_4 was measured on the buttress roots than on the stems, with a decreasing trend with height along the stems on a majority of trees. FCH_4 exhibited large variations over a 24-h cycle which were observed for the first time in this study. FCH_4 from sediment was twice higher at low tide compared to just before or after the flood period. FCH_4 from non-submerged stem positions at high tide was four times higher during the day than during the night. On buttress roots and on stem portion which were submerged, high FCH_4 were measured at the beginning of the ebb tide even at night. A better understanding of FCH_4 variability from mangrove trees and its controls, at different time scales and along spatial gradients is needed for accurate estimation of CH_4 budgets of mangrove forests.

Bruguiera gymnorrhizagreenhouse gasmangrove forestmethane (CH_4) fluxtidal cycle

Daniel Epron、Takumi Mochidome、A. T. M. Zinnatul Bassar、Rempei Suwa

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Graduate School of Agriculture, Kyoto University, Kyoto, Japan||Universite de Lorraine, AgroParisTech,INRAE, UMR Silva, Nancy, France

Graduate School of Agriculture, Kyoto University, Kyoto, Japan

Graduate School of Agriculture, Kyoto University, Kyoto, Japan||Department of Disaster Management,Begum Rokeya University,Rangpur, Bangladesh

Forestry Division, Japan International Research Centre for Agricultural Sciences (JIRCAS), Tsukuba, Japan

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2025

10.1111/1440-1703.12415

Ecological research

Ecological research

ISSN：0912-3814
年,卷(期)：2025.40(2)
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