河道型水库溶解甲烷浓度的空间异质性研究

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Abstract In this study, by connecting the newly fast-response automated gas equilibrator (FaRAGE) to a greenhouse gas analyzer, we investigated dissolved methane concentration (DMC) at the near-surface and its vertical profiles in the water column at a high resolution in channel-type reservoir-Xibeikou Reservoir in December 2021, together with measurements of water methane oxidation rate and sediment methane release rate on individual sampling sites, we preliminarily discussed the spatial heterogeneity and related influencing factors of DMC. The results showed that the DMC at the surface water ranged from 0.02 to 0.42μmol/L, with a mean of 0.11±0.08μmol/L and increased from the end to the head of the reservoir. The spatial heterogeneity of DMC in the water column within the reservoir was mainly attributed to CH₄ production in sediment, CH₄ consumption in the water column, and the inflow from the river; accordingly, high DMC in the water column of the reservoir tail resulted from the high CH₄ production and low CH₄ consumption due to shallow water, while low DMC in the water column of the reservoir head was caused by relatively low CH₄ production and high CH₄ consumption due to deep water; meanwhile, the inflow from the river may be one of the reasons for the vertical stratification of DMC.

Key words： channel-type reservoir dissolved concentration spatial heterogeneity Xibeikou Reservoir

Received: 24 May 2022

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X511

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	ZHANG Bo-wen
	LIU Jia
	NIU Feng-xia
	KANG Man-chun
	LI Zhe
	LI Shi-jian
	XIAO Shang-bin

Cite this article:

ZHANG Bo-wen,LIU Jia,NIU Feng-xia等. Spatial heterogeneity and influencing factors of dissolved methane in the channel-type reservoir[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(12): 5561-5569.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I12/5561

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