[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

*Shoji Hashimoto¹, Taiki Mori¹, Tadashi Sakata¹, Toru Hashimoto¹, Tomoaki Morishita¹, Takanori Shimizu¹, Yuji Kominami¹, Takafumi Miyama¹, Shigehiro Ishizuka¹, Naoyuki Yamashita¹, Toru Okamoto¹, Satoru Takanashi¹, Yoshiyuki Inagaki¹ (1.Forestry and Forest Products Research Institute)

Keywords:methane, carbon dioxide, forest soil, monitoring, mapping

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.