沙颖河丰水期CH_4排放特征及其影响因子研究  

Characteristics of CH_4 Emission from Shaying River and Its Influence Factors

作　　者：马培[1] 李亚林[1] 戚蓝月 田宪峰 杨丽标[2] MA Pei LI Yalin QI Lanyue TIAN Xianfeng YANG Libiao(College of Resource ＆ Environment, Henan Institute of Engineering, Zhengzhou 450000, China River and Coastal Environment Research Center, Chinese Research Academy of Environmental Science, Beijing 100012, China)

机构地区：[1]河南工程学院资源与环境学院,河南郑州450000 [2]中国环境科学研究院河流与河口海岸带环境创新基地,北京100012

出　　处：《环境科学与技术》2017年第2期26-30,38,共6页Environmental Science & Technology

基　　金：国家自然科学基金(41401549;41203080)

摘　　要：为研究沙颍河表层水体CH_4溶存浓度、饱和度、释放特征,该研究于7-9月利用顶空模型法对沙颍河主要站点进行观测分析,并探讨了环境因子对水体CH_4的影响。结果表明:丰水期沙颍河各个采样点CH_4浓度在0.001 2~3.120 4μmol/L之间,与世界河流相比处于较高的浓度水平。贾鲁河上游水体CH_4浓度最高,沙河-颍河交汇处浓度最低。水气界面CH_4的释放强度为(2.295 4±2.073 9)μmol/(m^2·h)。昼夜分析显示,沙颍河丰水期CH_4昼夜均处于过饱和状态,是大气的源。贾鲁河上游CH_4昼间释放量占总排放量的一半,沙颍河干流昼间排放量占61.06%,显著大于夜间排放量。丰水期水温偏高、DO偏低以及高浓度的NH_3-N是造成沙颍河CH_4浓度偏高的主要原因。The diffusive models were used to investigate the concentration,saturability and the diffusive fluxes of CH4 in Shaying River during July,August and September in 2015.The influence of environmental variables on CH4 emissions was also discussed.The results demonstrated that the concentration of CH4 in the surface water was 0.001 2-3.120 4 μmol/L.CH4 in upper stream of Jialu River was the highest.Estimated CH4 fluxes by the diffusive model were（2.295 4±2.073 9） μmol/（m-2·h）.Shaying River was the sources of CH4 which were in over saturation state during the day and night in high water period.CH4fluxes in daytime（nighttime） in the upper stream of Jialu River accounts for 50% of the total,while the fluxes of CH4 in daytime in Shaying River mainstream,significantly greater than that at night,accounts for 61.06% of the total.Water temperature,DO and NH3-N generally controlled the concentration of CH4 in the surface water.

关 键 词：沙颍河 CH4 排放通量 影响因子 

分 类 号：X522[环境科学与工程—环境工程]