JapanFlux2024 TH-Kms Kamphaeng Saen Rice Paddy

The seasonal flux dynamics of CH4 and CO2 in paddy fields in temperate Japan and tropical Thailand and the greenhouse gas balance obtained as the sum of CH4 and CO2 will be evaluated to investigate in detail the dynamics and mechanisms of CH4 emissions in paddy fields in tropical Thailand.
Field experiments were conducted during rice-cropping seasons in rice farm paddy fields in Hiratsuka, Kanagawa prefecture, Japan in 2013 and at Kamphaeng Saen campus, Kasetsart University in Nakhon Pathom Province, Thailand in 2014.
The turbulent fluxes of sensible heat, latent heat, CO2 were measured using the eddy covariance system.The CH4 were measured using the HREA(Hyperbolic relaxed eddy accumulation) method and Chamber method.The controlling factors for GHG dynamics and budgets were examined in both climate areas, and field experiments were conducted at around heading and flowering stages when CH4 emission is usually large.

为详细探究泰国热带水稻田的甲烷（CH4）排放动态与机制，本研究评估了日本温带地区与泰国热带地区水稻田的CH4、二氧化碳（CO2）季节通量动态，以及二者加和得到的温室气体收支。
本研究分别于2013年在日本神奈川县平冢市农田水稻田、2014年在泰国佛统府泰国农业大学（Kasetsart University）甘烹盛校区水稻田的水稻种植季开展田间试验。
本研究采用涡度协方差系统（eddy covariance system）测定感热、潜热与CO2的湍流通量；采用双曲线松弛涡度累积法（HREA, Hyperbolic relaxed eddy accumulation）与箱式法（Chamber method）测定CH4通量。同时，本研究在两个气候区域内考察了温室气体（GHG, Greenhouse Gas）动态与收支的调控因子，并在甲烷排放通常较高的孕穗期与开花期前后开展了重点田间观测。