巢湖不同富营养化区域甲烷排放通量与途径

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Abstract In order to better understand the spatiotemporal heterogeneity of methane emission fluxes and pathways in eutrophic lakes. Emission fluxes and pathways of CH₄ were studied in areas of different trophic levels in Lake Chaohu, a large and shallow eutrophic lake in Eastern China. A total of three study sites were deployed in the northwestern bay, the center of the west lake, and the center of the middle lake, respectively. Seasonal CH₄ emission fluxes and pathways at the water-air interface were examined by using floating flux chambers and an empirical diffusion model. The spatial variations of CH₄ concentrations and emission fluxes shared similar patterns with nutrient levels and chlorophyll-a contents in the waters and the sediments. The highest CH₄ were found in the northwestern bay, in which dissolved CH₄ in water was (0.178 ±0.002)~(1.123 ±0.026) μmol/L, CH₄ in surface sediments was (70.5 ±30.7)~(189 ±97.0) μmol/L, and the total emission flux of CH₄ was (50.1 ±2.93) ~ (1232 ±28.6)μmol/(m²·h). Diffusive fluxes of CH₄ in the three areas accounted for 7.3% ~ 42.9% of the total emission, and the fluxes of ebullition accounted for 57.1% ~ 92.7% of the total emission. The northwestern bay which was also more eutrophic than the other two areas shared the highest proportion of the ebullition. CH₄ emission pathways in Lake Chaohu were influenced by seasonal changes. There were the highest total CH₄ emission fluxes and ebullition fluxes in the summer, in which the contribution of ebullition to the total emission fluxes was as high as 98.1%.

Key words： methane concentration diffusion flux ebullition flux lake

Received: 25 November 2020

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	HE Kai
	WANG Hong-wei
	HU Xiao-kang
	AN Yan-fei
	ZHONG Ji-cheng
	ZHANG Lei

Cite this article:

HE Kai,WANG Hong-wei,HU Xiao-kang等. Emission fluxes and pathways of methane in different eutrophic areas of Lake Chaohu[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(7): 3306-3315.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I7/3306

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