Dissolved and emitted methane in the Poyang Lake

作     者：WANG HaiZhen HUANG Rong LI JiaRui CHEN Qian MA Tao WANG HaiZhen;HUANG Rong;LI JiaRui;CHEN Qian;MA Tao

作者机构：Key Laboratory of Water and Sediment SciencesMinistry of EducationCollege of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China School of Water Resources and EnvironmentMOE Key Laboratory of Groundwater Circulation and Environmental EvolutionChina University of Geosciences(Beijing)Beijing 100083China State Key Laboratory of Plateau Ecology and AgricultureQinghai UniversityXining 810016China College of Architecture and EnvironmentSichuan UniversityChengdu 610065China 

出 版 物：《Science China(Technological Sciences)》 (中国科学（技术科学英文版）)

年 卷 期：2021年第64卷第1期

页      面：203-212页

核心收录：

学科分类：0810[工学-信息与通信工程] 07[理学] 070602[理学-大气物理学与大气环境] 0805[工学-材料科学与工程（可授工学、理学学位）] 0706[理学-大气科学] 0702[理学-物理学] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：supported by the National Natural Science Foundation of China (Grant No. 51539001) 

主　　题：CH_(4) spatiotemporal variation linking-to-river lake Poyang Lake 

摘      要：Lake waters often act as important methane sources for global greenhouse gas emission, but it would be more complex as lakes are regulated by rivers. In this study, seasonal variations of dissolved and emitted methane in the Poyang Lake, the largest freshwater lake in China, are investigated based on a specially designed monitoring. As a typical subtropical linking-to-river lake, the Poyang shows characteristics of the lake in wet season and the river in dry season alternatively over a ***, CH_(4) flux from the Poyang Lake to the Yangtze River closes to the highest in January due to concentrated dissolved CH_(4) and river effects in dry season, while CH_(4) flux to the atmosphere falls to the lowest in July because of intensified CH_(4) oxidization and diluted dissolved CH_(4) as well as lake effects in wet season. Overall, CH_(4) fluxes from Poyang Lake to the atmosphere and to the Yangtze River were 19 and 0.35 Gg CH_(4) yr^(-1), respectively. The Three Gorges Dam, the world’s largest dam in the Yangtze River, would further intensify this pattern, enhancing the transformation between lake phase andriver phase. This study also provides the paradigm for CH_(4) budget from other large lakes in similar situations around the world.