潘家口水库温室气体溶存、排放特征及影响因素

杨凡艳; 张松林; 王少明; 胡晓康; 王洪伟; 汤梦瑶; 张敏; 钟继承

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中国环境科学 ›› 2021, Vol. 41 ›› Issue (11) : 5303-5313.

环境生态

潘家口水库温室气体溶存、排放特征及影响因素

杨凡艳^1,2, 张松林¹, 王少明³, 胡晓康^2,4, 王洪伟², 汤梦瑶², 张敏², 钟继承²

作者信息 +

Dissolution and emission patterns and influencing factors of greenhouse gases in Panjiakou Reservoir

YANG Fan-yan^1,2, ZHANG Song-lin¹, WANG Shao-ming³, HU Xiao-kang^2,4, WANG Hong-wei², TANG Meng-yao², ZHANG Min², ZHONG Ji-cheng²

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摘要

以大型深水水电类水库潘家口水库为例，于2020年春季（5月）、夏季（8月）在研究区设置33个采样点，采用顶空平衡-气相色谱法和经验模型法对水柱温室气体浓度和水-气界面扩散通量进行了观测及估算，并分析了潘家口水库温室气体浓度及通量的主要影响因素.结果表明：春季潘家口水库水-气界面CH₄、CO₂、N₂O平均通量分别为（1.11±1.60）μmol/（m²·h），（1333.31±546.43）μmol/（m²·h），（76.65±19.54）nmol/（m²·h）.夏季潘家口水库水-气界面CH₄、CO₂、N₂O平均通量分别为（0.62±1.13）μmol/（m²·h），（746.08±1152.44）μmol/（m²·h），（141.18±256.02）nmol/（m²·h）.潘家口水库温室气体排放呈现出大的时空异质性，空间上春季和夏季各温室气体通量均表现为干流大于支流；季节上CH₄与CO₂扩散通量表现为春季大于夏季，而N₂O扩散通量夏季大于春季.统计分析表明CH₄扩散通量主要受电导率、风速等环境因子影响，CO₂扩散通量受风速、pH及DOC影响，N₂O扩散通量主要受水柱NO₃^--N、NO₂^--N的影响.

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.

导出引用

杨凡艳, 张松林, 王少明, 胡晓康, 王洪伟, 汤梦瑶, 张敏, 钟继承. 潘家口水库温室气体溶存、排放特征及影响因素[J]. 中国环境科学. 2021, 41(11): 5303-5313

YANG Fan-yan, ZHANG Song-lin, WANG Shao-ming, HU Xiao-kang, WANG Hong-wei, TANG Meng-yao, ZHANG Min, ZHONG Ji-cheng. Dissolution and emission patterns and influencing factors of greenhouse gases in Panjiakou Reservoir[J]. China Environmental Science. 2021, 41(11): 5303-5313

中图分类号： X511

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