Characteristics of greenhouse gas occurrence and emission in summer and autumn of Daheiting Reservoir
GONG Wan-qing1,2, WEN Shuai-long1,2, WANG Hong-wei1,2, WU Tao3, LI Xin1,4, ZHONG Ji-cheng1
1. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Lakes, Chinese Academy of Sciences, Nanjing 210008, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China; 3. Tianjin Hydraulic Research Institute, Tianjin 300061, China; 4. College of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
Abstract:As a typical entrophic reservoir in North China, the surface water of 27 sites in Daheting Reservoir was sampled and the concentrations of surface dissolved carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) were determined by using headspace equilibrium method, to estimate its water-gas interface diffuse flux in the summer and autumn in 2018. Results indicated that the surface of Daheiting Reservoir was mainly a source of CO2, CH4 and N2O. The mean values of CO2 concentration and diffusion flux were (72.75±67.49)μmol/L and (810.62±790.64)μmol/(m2·h) in summer, and were (394.64±104.13)μmol/L and (4822.81±1250.00)μmol/(m2·h) in antumn, respectively. The mean concentration and diffusion flux of CH4 were (0.19±0.12)μmol/L and (3.04±2.10)μmol/(m2·h) in summer, and were (0.41±0.26)μmol/L and (5.16±3.23)μmol/(m2·h) in autumn, respectively. The mean values of N2O concentration and diffusion flux were (0.03±0.01)μmol/L and (0.31±0.10)μmol/(m2·h) in summer, and were (0.03±0.01)μmol/L and (0.25±0.15)μmol/(m2·h) in autumn, respectively. The results of correlation analysis indicated that the concentrations of dissolved CO2 and N2O were mainly correlated with temperature, water depth and conductivity, while CH4 concentration was mainly correlated with water depth and conductivity in summer. Concentrations of dissolved CO2 was mainly correlated with temperature, water depth and TDS, while CH4 concentration was mainly correlated with temperature, water depth and TDS, while N2O concentration was mainly correlated with water depth.
龚琬晴, 文帅龙, 王洪伟, 吴涛, 李鑫, 钟继承. 大黑汀水库夏秋季节温室气体赋存及排放特征[J]. 中国环境科学, 2019, 39(11): 4611-4619.
GONG Wan-qing, WEN Shuai-long, WANG Hong-wei, WU Tao, LI Xin, ZHONG Ji-cheng. Characteristics of greenhouse gas occurrence and emission in summer and autumn of Daheiting Reservoir. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(11): 4611-4619.
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