泥河水库夏季水–气界面甲烷通量日变化研究

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)2,1:00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.

Diurnal methane flux across water-air interface in summer in Nihe reservoir

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.