为研究东北地区灌溉型水库的甲烷日排放特征,试验采用静态浮箱法于2008年7月测定了泥河水库水-气界面的甲烷通量.结果发现,泥河水库夏季甲烷平均排放通量为13.48 mg/(m2·h)；夜间(21:00)甲烷排放最低,日间(5:00和9:00)最高.不同时刻的甲烷通量存在显著差异(P＜0.05),21:00的甲烷排放通量显著低于5:00和9:00的甲烷通量.泥河水库出水口、库中心和进水口的甲烷通量差异不显著.相关分析表明,甲烷通量与总氮存在显著正相关(P＜0.05),与气温、水温、水中总有机碳、水中溶解有机碳、总磷、水深、风速、溶氧等环境因子均未达到显著相关.%In order to study diurnal methane emission of irrigated reservoir in northeast China, Static floating chamber methods were used to measure methane flux across water-air interface in Nihe reservoir in July 2008. The results indicated that the mean methane flux of Nihe reservoir was 13.48 mg/(m2 · H) in summer; the lowest emission occurred at night (21:00) and the emission peak observed at day (5:00 and 9:00). There was significant difference between different time of day (P <0.05) and the methane flux at 21:00 was significantly lower than that of at 5 :00 and 9:00. There was no significant difference in outlet, center and outlet of reservoir. Correlation analysis showed that methane flux was positive relation significantly with total nitrogen (P <0.05 ) , and there were no significant relation with other environmental factors including air temperature, water temperature, total organic carbon , dissolved organic carbon, total phosphoric, water depth, wind speed and dissolved oxygen.
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