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引用本文:肖启涛,胡正华,张弥,王伟,肖薇.水力调控对湖泊甲烷扩散通量的影响.湖泊科学,2021,33(2):561-570. DOI:
Xiao Qitao,Hu Zhenghua,Zhang Mi,Wang Wei,Xiao Wei.Effects of water diversion on methane diffusion flux across the water-air interface in lakes. J. Lake Sci.2021,33(2):561-570. DOI:
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水力调控对湖泊甲烷扩散通量的影响
肖启涛1, 胡正华2, 张弥2, 王伟2, 肖薇2
1.中国科学院南京地理与湖泊研究所, 中国科学院流域地理学重点实验室, 南京 210008;2.南京信息工程大学气象灾害预报预警与评估协同创新中心, 南京 210044
摘要:
外源引水等水力调控措施常用于湖泊水环境综合整治中,作为人类施加到湖泊显著的外界活动,其对湖泊甲烷(CH4)扩散通量的影响鲜有报道.贡湖湾作为"引江济太"工程长江来水进入太湖的第一站,其CH4通量变化是对水力调控的最好响应.基于2011年11月至2013年8月逐月的野外观测表明,贡湖湾平均CH4扩散排放量为0.073 mmol/(m2·d),显著高于参考水域(湖心区)CH4排放量(均值:0.017 mmol/(m2·d)).贡湖湾不同站点间CH4通量也表现出显著差异,但湖心区域无此现象.贡湖湾和湖心2个区域的CH4扩散通量均有明显的时间变化,且与水温呈显著正相关.但因受到外源来水的影响,贡湖湾CH4通量时间变化的温度依赖性相对较低.总体上外源引水显著提高了湖体CH4排放量,考虑到湖泊CH4通量受内部因子和外部因子的综合协调影响,其潜在的控制机制还需要进一步探讨.
关键词:  甲烷  扩散通量  外源引水  时空变化  影响因子  太湖  贡湖湾
DOI:
分类号:
基金项目:国家自然科学基金项目(41801093)、中国科学院南京地理与湖泊研究所引进人才启动项目(NIGLAS2019QD007)和中国科学院南京地理与湖泊研究所交叉创新团队项目(NIGLAS2016TD01)联合资助.
Effects of water diversion on methane diffusion flux across the water-air interface in lakes
Xiao Qitao1, Hu Zhenghua2, Zhang Mi2, Wang Wei2, Xiao Wei2
1.Key Laboratory of Watershed Geographic Science, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China;2.Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, P. R. China
Abstract:
Manual water diversion has been applied to improve the water environment of lake, however, its effects on CH4 diffusion flux across water-air interface have not been well documented. To improve the water quality of Lake Taihu, the project of water transfers from Yangtze River is a long-term effort. As the first stop that water transfers into Lake Taihu from Yangtze River, Gonghu Bay is the fine place to evaluate the effects of water diversion on lake CH4 flux. Field measurements from November 2011 to August 2013 showed that, the CH4 diffusion flux at Gonghu Bay with a mean value of 0.073 mmol/(m2·d) was significantly higher than at the central zone with a mean value of 0.017 mmol/(m2·d). Meanwhile, CH4 flux varied among sites at Gonghu Bay. The CH4 flux at the two-zone both showed temporal variability, which was regulated by water temperature. However, the role of temperature varied among the two zones, the water diversion may confound the effect of temperature on CH4 flux at Gonghu Bay, leading to the relatively less temperature dependency of CH4 flux. Manual water diversion increased the lake CH4 emission flux as a whole, however, lake CH4 emission was controlled by multiple, interconnected factors related to internal metabolic activities and external loading, further studies are needed to explore the underlying mechanism.
Key words:  Methane  diffusion flux  water diversion  spatial-temporal variation  influencing factors  Lake Taihu  Gonghu Bay
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