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长江三角洲平原河网水体溶存CH_4和N_2O浓度及其排放通量 被引量:28

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摘要 以上海市黄浦江上游和崇明岛河网为代表,对长江三角洲平原河网夏季表层水体溶存甲烷(CH4)和氧化亚氮(N2O)浓度、饱和度及其水-气界面排放通量进行了研究.结果表明,河网水体溶存CH4浓度在(0.30±0.03)~(6.66±0.14)μmol·L-1之间,N2O浓度在(13.8±2.33)~(435±116)nmol·L-1之间,CH4和N2O溶存浓度处于高度过饱和状态(饱和度分别为(468±49.0)%~(11560±235)%和(175±29.5)%~(4914±1304)%).水体中溶解氧(DO)含量是控制溶存CH4浓度的主要因素,而水体溶存N2O的浓度同硝酸根(NO3-)、亚硝酸根(NO2-)、化学需氧量(CODcr)浓度呈显著正相关,同盐度和pH呈显著负相关关系.河道水体中溶存CH4和N2O主要产生于河底沉积物中的甲烷化过程和反硝化过程,并扩散到水体中,进而排放到大气.夏季7月上海市河网水体-大气界面CH4和N2O排放通量达到(778±59.8)和(236±63.6)μmol·m-2·h-1,平原地区河网的富营养化使其成为大气CH4和N2O的一个重要潜在排放源.
出处 《中国科学(B辑)》 CSCD 北大核心 2009年第2期165-175,共11页 Science in China(Series B)
基金 国家自然科学基金(批准号:40730526) 上海市"十一五"重大科技攻关项目(编号:07DZ12037) 国家"十一五"重大水专项(批准号:2008ZX07317-006) 上海市海洋局908专项(编号:HAD1 HAD2) 中国博士后科学基金(批准号:20060400635)资助
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