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当前位置: 首页 > 文章 > 雅鲁藏布江河水中CH_4和N_2O气体浓度及释放特征 生态学杂志 2019 (3) 791-798
Position: Home > Articles > Concentrations and emissions of dissolved CH_4 and N_2O in the Yarlung Tsangpo River Chinese Journal of Ecology 2019 (3) 791-798

雅鲁藏布江河水中CH_4和N_2O气体浓度及释放特征

作  者：
叶润成;吴起鑫;赵志琦;胡健;崔丽峰;丁虎
单  位：
中国科学院地球化学研究所环境地球化学国家重点实验室;University of Glasgow;贵州大学国土资源部喀斯特环境与地质灾害重点实验室
关键词：
河流;甲烷(CH4);氧化亚氮(N2O);气体通量;影响因素
摘  要：
河流向大气释放大量温室气体,是陆地生态系统物质循环和能量流动的重要环节。山地河流是温室气体排放的热点区域,但迄今山地河流CH_4和N_2O释放方面的研究较少。为探究高原中大型河流CH_4和N_2O浓度的时空分布特征及其影响因素,对雅鲁藏布江(雅江)干流和主要支流河水中CH_4和N_2O气体进行了季节性采样分析。结果表明,雅江河水中CH_4含量为2.3～864.9 nmol·L-1,N_2O含量为8.2～23.7 nmol·L-1,枯水期CH_4含量和丰水期无显著差异(P=0.112),但枯水期N_2O含量显著高于丰水期(P=0.017),流量和水温可能分别是影响CH_4和N_2O变化的主要因子。雅江河水CH_4和N_2O的释放速率分别为4.3～11.1 mg C·m-2·d-1和0.16～0.37 mg N·m-2·d-1,排放量分别为1.88～4.59Gg C·a-1和0.07～0.16 Gg N·a-1,分别约占全球河流CH_4和N_2O释放量的1.25‰～3.06‰和2.17‰～4.96‰。山地河流CH_4和N_2O的排放需要引起重视,全球河流温室气体释放可能需要进行重新评估。
译  名：
Concentrations and emissions of dissolved CH_4 and N_2O in the Yarlung Tsangpo River
作  者：
YE Run-cheng;WU Qi-xin;ZHAO Zhi-qi;HU Jian;CUI Li-feng;DING Hu;Key Laboratory of Karst Environment and Geohazard,Ministry of Land and Resources,Guizhou University;State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences;University of Glasgow;
单  位：
YE Run-cheng%WU Qi-xin%ZHAO Zhi-qi%HU Jian%CUI Li-feng%DING Hu%Key Laboratory of Karst Environment and Geohazard,Ministry of Land and Resources,Guizhou University%State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences%University of Glasgow
关键词：
river;;CH4;;N2O;;gas flux;;influencing factor
摘  要：
Rivers release large quantities of greenhouse gases into the atmosphere,which is an important link in the material cycling and energy flow of terrestrial ecosystems. Mountainous rivers are ‘hotspots' for greenhouse gas emission,but the release of CH_4 and N_2O from those rivers has been less documented. To explore the spatio-temporal distributions and related controls of CH_4 and N_2O in middle-large plateau rivers,the seasonal variations of CH_4 and N_2O in tributary and main stream of the Yarlung Tsangpo River were examined. The results showed that the ranges of CH_4 and N_2O concentrations in the Yarlung Tsangpo were 2.3-864.9 and 8.2-23.7 nmol·L-1,respectively. There was no significant difference in CH_4 concentrations between low-flow and high-flow periods( P = 0. 112),but the N_2O contents were higher in low-flow months than in high-flow months( P = 0.017). River water discharge and water temperature were the major factors controlling the dynamics of CH_4 and N_2O emission,respectively. The release rates of CH_4 and N_2O in the Yarlung Tsangpo River ranged 4.3-11.1 mg C·m-2·d-1 and 0.16-0.37 mg N·m-2·d-1,respectively. The emission amounts of CH_4 and N_2O in Yarlung Tsangpo River system were 1.88-4. 59 Gg C · a-1 and 0. 07-0. 16 Gg N · a-1,accounting for 1.25‰-3.06‰ and2.17‰-4.96‰ of global river estimations,respectively. The evasion of CH_4 and N_2O in mountainous rivers need further detailed studies,which may revise the global estimation of greenhouse gas emission.

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