Dissolution and emission patterns and influencing factors of greenhouse gases in Panjiakou Reservoir
YANG Fan-yan1,2, ZHANG Song-lin1, WANG Shao-ming3, HU Xiao-kang2,4, WANG Hong-wei2, TANG Meng-yao2, ZHANG Min2, ZHONG Ji-cheng2
1. College of Geography and Environmental Sciences, Northwest Normal University, Lanzhou 730070, China; 2. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; 3. Bureau of Luanhe Diversion Project, Haihe Water Conservancy Commission, Ministry of Water Resources, Qianxi 064309, China; 4. School of Environmental Science and Engineering, Anhui Normal University, Wuhu 241000, China
Abstract:Hydropower reservoirs are important natural source of greenhouse gas emissions. Therefore, taking Panjiakou Reservoir, a large hydroelectric reservoir with deep water as an example, 33 sampling stations were set up in Panjiakou Reservoir in spring (may) and summer (August) of 2020. Headspace equilibrium gas chromatography and empirical model methods were used to measure the greenhouse gas concentrations in surface water and estimate the diffusive fluxes at the water-air interface, and the main influencing factors of greenhouse gas concentrations and fluxes in Panjiakou Reservoir were also analyzed. The results show that the average fluxes of CH4, CO2 and N2O at the water-air interface of Panjiakou Reservoir in spring were (1.11±1.60)μmol/(m2·h), (1333.31±546.43) μmol/(m2·h), (76.65±19.54) nmol/(m2·h), respectively. In summer, the average fluxes of CH4, CO2 and N2O at the water- air interface of Panjiakou Reservoir were (0.62±1.13) μmol/(m2·h), (746.08±1152.44)μmol/(m2·h), (141.18±256.02) nmol/(m2·h), respectively. The greenhouse gas emissions of Panjiakou Reservoir showed large spatio-temporal heterogeneity, the greenhouse gas fluxes of the main body were larger than those of the tributaries in spring and summer; the diffusion fluxes of CH4 and CO2 in spring were larger than those in summer, and the diffusion fluxes of N2O in summer are larger than those in spring. The results of statistical analysis shows that methane diffusion fluxes were mainly affected by environmental factors such as conductivity and wind speed, CO2 diffusion fluxes were affected by wind speed, pH and DOC, and N2O diffusion fluxes were mainly affected by NO3--N、NO2--N in water column.
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