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通过大田小区实验,采用静止箱-气相色谱法对早晚两季水稻品种CH4与N2O排放通量进行了观测.结果表明,早稻CH4排放季节变化呈单峰模式,N2O排放呈双峰模式;晚稻CH4与N2O排放季节变化均呈单峰模式.CH4、N2O季节平均排放通量品种间均存在显著差异(P<0.05).早稻品种CH4、N2O季节平均排放通量极差分别为0.58 mg.(m2.h)-1、5.89μg.(m2.h)-1,晚稻为4.06 mg.(m2.h)-1、5.70μg.(m2.h)-1;早稻品种温室气体排放的增温潜势、单位产量增温潜势极差分别为2.92 kg.hm-2、0.097 kg.kg-1,晚稻分别为2 256 kg.hm-2、0.28 kg.kg-1.增温潜势、单位产量增温潜势比较,常规稻>超级杂交稻>杂交稻.早稻无水稻种植区CH4、N2O季节排放通量分别是水稻种植区的27.1%～31.8%、33.6%～88.3%;晚稻分别是23.8%～28.8%、38.6%～45.3%.早稻适宜种植品种为陆两优819、金优402、湘早籼24号,晚稻品种为岳优9113、湘晚籼12号.
The daily and seasonal variations of CH4 and N2O fluxes of rice varieties in the two seasons were studied by field-chamber experiments using stationary box-gas chromatography.The results showed that the seasonal variation of CH4 emission of early rice was single-peaked and N2O emission was bimodal; (P <0.05). The average seasonal flux of CH4 and N2O in early rice varieties were 0.58 mg (m2) (m2.h) -1 for late rice, 4.06 mg. (m2.h) -1,5.70μg. (m2.h) -1 for late rice, and the warming potential of greenhouse gases in early rice varieties Potential warming potential difference was 2.92 kg.hm-2,0.097 kg.kg-1 for late rice and 2 256 kg.hm-2,0.28 kg.kg-1 for late rice respectively. The warming potential, unit The results showed that the seasonal fluxes of CH4 and N2O were 27.1% -31.8% and 33.6% -88.3%, respectively, in paddy-rice planting areas in early rice and late rice were 23.8% ~ 28.8%, 38.6% ~ 45.3% .The suitable varieties for early rice were Luliangyou 819, Jinyou 402 and Xiangzaoshansi 24, and the late rice varieties were Yueyou 9113 and Xiangwananxian 12.