Methane and Nitrous oxide flux: Closed chamber method, using gas chromatography (FID and ECD).
Replication number is 30. CH4 and N2O efflux flux between soil and atmosphere was measured in a broadleaf deciduous forest floor at each season.
Ecological plot, AsiaFlux TKY site (137deg25m24sE 36deg8m43sN). Vegetation is an approximately 50 year old secondary deciduous forest, primarily dominated by oak (Quercus crispula Blume) and Birch (Betula ermanii Cham; Betula platyphylla Sukatchev var.japonica Hara). and the understory is dominated by dense evergreen dwarf bamboo (Sasa senanensis (Fr. Et Sav.) Rehder) (Saigusa et al. 2005, Agr. For. Met. 134, 4-16).
The CH4 and N2O flux was measured in daytime at each season.