[B-CG04] Methane in terrestrial and aquatic ecosystems: from microbes to the atmosphere

[BCG04-04] Nationwide monitoring of forest soil methane and carbon dioxide fluxes in Japan

*橋本 昌司¹、森 大喜¹、阪田 匡司¹、橋本 徹¹、森下 智陽¹、清水 貴範¹、小南 裕志¹、深山 貴文¹、石塚 成宏¹、山下 尚之¹、岡本 透¹、高梨 聡¹、稲垣 善之¹ (1.森林総合研究所)

キーワード：メタン、二酸化炭素、森林土壌、モニタリング、マッピング

Methane (CH₄), like carbon dioxide (CO₂), is an important greenhouse gas (GHG) in climate change and needs to be reduced. Therefore, the detailed monitoring and high-precision upscaling of these GHGs are essential. Most upland forest soils serve as important methane sinks in the global methane cycle, and soil CO₂ fluxes from forest soils are among the largest carbon fluxes in the global carbon cycle.
To monitor and assess soil GHG fluxes at the national level, we launched nationwide monitoring of forest soil GHG fluxes in 2022. The sites in the network are mostly research sites operated by the FFPRI, covering regions from Hokkaido to Kyushu.
Three to ten chambers were distributed in the watershed to cover the different topographies, and soil GHG fluxes were monitored at monthly intervals. Our goals are to reveal the temporal changes in forest soil GHG fluxes and provide high-resolution nationwide maps of forest soil GHG fluxes.