夏季温榆河温室气体释放特征与影响因素研究
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摘要
国内外对水-气界面温室气体释放研究,主要集中在自然河流、湖泊、人工水库、沼泽、水稻田等方面,对于城市河流温室气体的研究报道相对较少。文章以北京市温榆河为研究对象,采用在线-静态通量箱法,对城市河流夏季水-气界面CO_2和CH_4释放通量进行了原位监测。研究结果表明:温榆河夏季水-气界面CO_2和CH_4平均释放通量分别为342.78和17.09 mg/(m~2·h),暴雨后分别为566.46和3.89 mg/(m~2·h)。由此计算暴雨前后所产生的总增温效应CO_2当量通量分别为932.84和698.72 mg/(m~2·h),暴雨前CH_4所产生的增温效应贡献率大于CO_2,暴雨后反之。在夏季城市河流温榆河水-气界面CO_2和CH_4通量受到pH值、溶解氧(DO)、氧化还原电位(ORP)、总氮(TN)等因素影响,总体上温榆河夏季水-气界面表现为温室气体的释放源。研究结果在城市河流温室气体排放方面具有一定的代表性,并为估算城市河流水体对大气温室效应的影响提供依据。
The recent study on release of greenhouse gases from water-air interface mainly focus in natural rivers, lakes,artificial reservoirs, marshes, rice fields. However, there is little understanding about greenhouse gases in urban river. In order to study the greenhouse gases emission characteristics of the urban rivers in summer, taking Wenyu River, Beijing for example and LGR-airtight floating dynamic flux chamber method was used to monitor CO_2 and CH_4fluxes from water-air interface. Results showed that the average gas fluxes were 342.78 and 17.09 mg/(m~2·h) for CO_2 and CH_4respectively,whereas the gas fluxes after rainstorm were 566.46 and 3.89 mg/(m2·h) for CO_2 and CH_4, respectively. After rainstorm, total CO_2-equivalent fluxes of the two gases, the global warming potential, decreased from 932.84 to 698.72 mg/(m~2·h). CH_4 was the dominant in the total fluxes before rainstorm, while CO_2 was the dominant after rainstorm. In summer, CO_2 and CH_4fluxes from water-air interface in Wenyu River were mainly influenced by pH, DO, ORP and TN. The result of this study suggestedthat the urban river is an emission source of greenhouse gases in summer. This study can make up for a lack of urban river in greenhouse gas emissions, and provide a basis for estimating the effect of urban river water on the greenhouse.
The recent study on release of greenhouse gases from water-air interface mainly focus in natural rivers, lakes,artificial reservoirs, marshes, rice fields. However, there is little understanding about greenhouse gases in urban river. In order to study the greenhouse gases emission characteristics of the urban rivers in summer, taking Wenyu River, Beijing for example and LGR-airtight floating dynamic flux chamber method was used to monitor CO_2 and CH_4fluxes from water-air interface. Results showed that the average gas fluxes were 342.78 and 17.09 mg/(m~2·h) for CO_2 and CH_4respectively,whereas the gas fluxes after rainstorm were 566.46 and 3.89 mg/(m2·h) for CO_2 and CH_4, respectively. After rainstorm, total CO_2-equivalent fluxes of the two gases, the global warming potential, decreased from 932.84 to 698.72 mg/(m~2·h). CH_4 was the dominant in the total fluxes before rainstorm, while CO_2 was the dominant after rainstorm. In summer, CO_2 and CH_4fluxes from water-air interface in Wenyu River were mainly influenced by pH, DO, ORP and TN. The result of this study suggestedthat the urban river is an emission source of greenhouse gases in summer. This study can make up for a lack of urban river in greenhouse gas emissions, and provide a basis for estimating the effect of urban river water on the greenhouse.
引文
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[22]李哲,姚骁,何萍,等.三峡水库澎溪河水-气界面CO2、CH4扩散通量昼夜动态初探[J].湖泊科学,2014,26(4):576-584.Li Zhe,Yao Xiao,He Ping,et al.Diel variations of air-water CO2and CH4diffusive fluxes in the Pengxi River,Three Gorges Reservoir[J].Journal of Lake Science,2014,26(4):576-584.(in Chinese)
[23]张永勇,陈军锋,夏军,等.温榆河流域闸坝群对河流水量水质影响分析[J].自然资源学报,2009,24(10):1697-1705.Zhang Yongyong,Chen Junfeng,Xia Jun,et al.Research on the impact of dams and floodgates on riverine runoff and water quality in Wenyu River basin[J].Journal of Natural Resource,2009,24(10):1697-1705.(in Chinese)
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