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dc.contributor.authorSakabe, Ayakaja
dc.contributor.authorHamotani, Kenja
dc.contributor.authorKosugi, Yoshikoja
dc.contributor.authorUeyama, Masahitoja
dc.contributor.authorTakahashi, Kenshija
dc.contributor.authorKanazawa, Akitoja
dc.contributor.authorItoh, Masayukija
dc.contributor.alternative坂部, 綾香ja
dc.description.abstractVery few studies have conducted long-term observations of methane (CH4) flux over forest canopies. In this study, we continuously measured CH4 fluxes over an evergreen coniferous (Japanese cypress) forest canopy throughout 1 year, using a micrometeorological relaxed eddy accumulation (REA) system with tuneable diode laser spectroscopy (TDLS) detection. The Japanese cypress forest, which is a common forest type in warm-temperate Asian monsoon regions with a wet summer, switched seasonally between a sink and source of CH4 probably because of competition by methanogens and methanotrophs, which are both influenced by soil conditions (e.g., soil temperature and soil moisture). At hourly to daily timescales, the CH4 fluxes were sensitive to rainfall, probably because CH4 emission increased and/or absorption decreased during and after rainfall. The observed canopy-scale fluxes showed complex behaviours beyond those expected from previous plot-scale measurements and the CH4 fluxes changed from sink to source and vice versa.ja
dc.rightsThe final publication is available at www.springerlink.comja
dc.rightsThis is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。ja
dc.titleMeasurement of methane flux over an evergreen coniferous forest canopy using a relaxed eddy accumulation system with tuneable diode laser spectroscopy detectionja
dc.type.niitypeJournal Articleja
dc.identifier.jtitleTheoretical and Applied Climatologyja
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