【摘要】 经早稻、中稻、晚稻三季２４ ｈ 稻田甲烷监测结果表明，种植杂交稻没有明显增进稻田甲烷排放的作用。在三季种植中，甲烷释放总量除连晚杂交稻田比常规稻高外，早稻、单季稻都是杂交稻田低于常规稻。稻田甲烷每周日平均释放量在水稻生长前期（ 移栽后５ ～７ 周） 杂交稻高于常规稻，孕穗至收获则杂交稻低于常规稻。温度对甲烷释放影响十分明显，在不同种植季，稻田甲烷释放模式不同。在三个水稻种植季中，除个别值外杂交稻田的土壤水溶甲烷含量基本都低于常规稻田。经测定，杂交稻田的土壤产甲烷细菌数量及土壤产甲烷潜力明显高于常规稻田，其中产甲烷细菌数可相差数倍乃至２ 个数量级。更多还原

【Abstract】 The experiment of planted hybrid and conventional rice in double and single season were carried out in 1996. The integrating continuous CH4 flux measurements showed that CH4 emission from hybrid rice field were higher in the early growth stage (5 - 7 weeks after transplanting ) and lower in late stage (booting - harvesting ) than those from conventional rice in three planting season. Compared with planted conventional rice, planted hybrid rice resulted in CH4 emission reduction by 6.4% in early rice and 8.9 % in single rice, and increment by 11.6 % in double late rice. As methane emission was highly effected by temperature, in difference rice planting season the patterns of mention emission were different. Determining the amount of CH4 dissolved in soil solution also demonstrated that the dissolved methane in planted hybrid rice field was lower than that of planted conventional rice field. The amounts of methane-producing bacteria and methane production potential of the planted hybrid rice soil were much higher than those of planted conventional rice.更多还原