水稻适雨灌溉对稻田CH_4和N_2O排放的影响

采用静态暗箱-气相色谱法,观测分析了水稻适雨灌溉和常规灌溉2种模式下稻田CH_4和N_2O的季节排放情况,评估了水稻适雨灌溉对稻田CH_4和N_2O排放的影响。结果表明,适雨灌溉稻田CH_4、N_2O排放峰值分别出现在分蘖期和拔节孕穗期,整个生育期CH_4、N_2O平均排放通量分别为16.77 mg/(m~2·h)、6.64μg/(m~2·h),适雨灌溉稻田CH_4、N_2O排放量较常规灌溉显著下降(p0.05),分别下降了74.47%和67.06%。水稻适雨灌溉通过合理利用雨水资源,减少灌溉次数及灌水量,显著降低了稻田CH_4和N_2O的排放。

Effects of Irrigation Adjusted by Rainfall on Emissions of CH4 and N2O from Paddy Fields

This paper compared the impactof conventional irrigation and irrigation adjusted by rainfall on emis-sions of CH4 and N2O emissions from paddy fields. The emissions of the two gases were measured using static chamber and gas chromatography. The results showed that under irrigationadjusted byrainfall, the emissions of CH4 and N2O peaked at tillering and booting stages. During the growth season, the average emissions of CH4 and N2O under the adjusted irrigation were 16.77 mg/(m2 · h)and 6.64 μg/(m2 · h)respectively, decreasing by 74.47%and 67.06% respectively compared with those under the conventional irrigation(p<0.05). Adjusting irrigation by rainfall in paddy fields reduced irrigation frequency and water consumption, thereby reducing greenhouse gas emissions.