Impacts of experiment warming on soil CO emissions and CH uptake in Japanese forests

Sun, L.*; Liang, N.*; Takagi, Kentaro*; Ishida, Sachinobu*; Takagi, Masahiro*; Teramoto, Munemasa*; Kondo, Toshiaki*; Koarashi, Jun   ; Atarashi-Andoh, Mariko  ; Zeng, J.*; Hirano, Takashi*; Takahashi, Yoshiyuki*

Methane (CH) is the second most important greenhouse gas after carbon dioxide (CO), contributing to human-induced global warming. To investigate warming impacts on soil CO emission and CH uptake, we conducted warming experiment with multi-channel automated chamber measurement system in five forests from northern Hokkaido to Miyazaki. Both CO emission and CH uptake rates were generally higher under the experimental warming condition than under the control condition at almost all of the sites. The seasonal variation in CH flux was more sensitive to soil moisture than that in CO flux. Results demonstrated that both fluxes can be enhanced by changing microbial activity or soil surface moisture through warming treatment.