中文摘要：

通过温室盆栽试验研究相同施肥条件下,不同水分管理（持续淹水,分蘖肥后提前烤田、正常烤田和推迟烤田）对水稻生长期CH4排放的影响。结果表明,对烤田处理而言,CH4的排放峰值出现在烤田期间,在此期间CH4排放量占季节排放量的38.75%～52.21%。烤田初期出现排放高峰,然后急剧下降,烤田结束前接近于零;水稻生长后期干湿交替阶段只有少量CH4排放。提前烤田、正常烤田和推迟烤田3个处理水稻生长期CH4平均排放通量依次为0.86、0.96、1.45mg/（m2·h）,烤田开始越晚,CH4排放越多。土壤Eh是影响不同烤田处理水稻生长期CH4排放的主要因素。持续淹水处理水稻移栽30天后的CH4排放通量与土壤温度呈显著性相关（r=0.682^＊＊,p〈0.01）。持续淹水处理CH4排放通量是烤田处理的12～20倍。

英文摘要：

A greenhouse pot experiment was carried out in rice-growing season to investigate the effects of water management on methane （CH4） emissions. Four treatments including continuous flooding （CF）, keepinng 3 to 5 cm water layer during the rice-growing season; early aeration （EA）, 24 days after rice transplanting; normal aeration （NA）, 30 days after rice transplanting ; late aeration （LA）, 38 days after rice transplanting were dedicated to this experiment. The results showed that CH4 emissions of different aeration treatments sharply incrcased after the beginning of mid-season aeration and then quickly decreased to near zero. Significant uegative correlations between CH4 emission and soil Eh were discovered during rice-growing period （p〈0.01）. The total CH4emission of different aeration treatments during aeration periods accounted for 38.75% - 52.21% of those emitted during the whole rice-growing season. The average CH4 fluxes of EA, NA and LA were 0.86, 0.96, 1.45 mg/（m^2·h）, respectively. So it is easily found that the later it began to aerate, the more CH4, emitted. The CH4 emission of treatment CF was 12 - 20 times more than those of aeration treatments. Significant positive correlation between CH4 flux and soil temperature of treatment CF was found during rice-growing period excluding the first 30 days （r = 0.682^＊＊, p〈0.01）.