潘家口水库温室气体溶存、排放特征及影响因素

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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.

Key words： reservoir greenhouse gases water-gas interface diffusion flux impact factor

Received: 06 April 2021

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	YANG Fan-yan
	ZHANG Song-lin
	WANG Shao-ming
	HU Xiao-kang
	WANG Hong-wei
	TANG Meng-yao
	ZHANG Min
	ZHONG Ji-cheng

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YANG Fan-yan,ZHANG Song-lin,WANG Shao-ming等. Dissolution and emission patterns and influencing factors of greenhouse gases in Panjiakou Reservoir[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(11): 5303-5313.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I11/5303

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