水稻油菜轮作稻田甲烷排放及其总量估算

利用静态箱/气相色谱法对川中丘陵区水稻油菜轮作稻田进行水稻全生长季CH4排放观测。结果表明,稻田CH4排放有明显的季节变化,呈“前低后高”的变化趋势,CH4排放峰出现在水稻抽穗扬花期;测定期内稻田CH4平均排放通量为6.20mg/m2.h。对影响稻田CH4排放的因素分析发现,淹水条件下水稻移栽到抽穗初期,水稻植株生长是影响稻田CH4排放的关键因素;水稻抽穗期到成熟期,温度是影响稻田CH4排放的关键因素。水稻油菜轮作稻田在水稻生长季中CH排放总量为173.96kg/hm2。

Methane emission from rice-rape rotation paddy fields and its total amount estimation

Methane emission fluxes from rice-rape rotation paddy fields were measured by the static chamber-gas chromatographic techniques in hilly area of the central Sichuan Basin. The results show that CH₄ emission from paddy fields varies remarkably and seasonally during the rice-growing season, and the peak value of methane emission is presented in the metaphase of rice bearing stage. The average flux of CH₄ emission from paddy fields is 6.20 mg/m²·h. The influencing factors on CH₄ emission from paddy fields are discussed in this paper. The rice plants play a key role in the methane emission during the early growing stage of rice; while the temperature plays a key role in the methane emission during the tassel and mature stage of rice. The total amount of CH₄ emission during the rice growing season is about 173.96kg/hm².