太湖沉积物产甲烷速率时空变化与影响因素

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Abstract Researches on lake methane (CH₄) production are of great significance for understanding the global CH₄ budget since lakes are important releasing sources for CH₄. In this study, sediment samples were firstly collected from Lake Taihu China then incubated in the laboratory with the purpose of investigating the temporal and spatial variations of the sediment methane production rates (MPR) in the lake. The environmental factors influencing the production rates were also analyzed. The results showed that MPR in sediments from Lake Taihu was 0.007~176.03μmol/(L·d). Higher MPR were found in the northwest bays and the eastern areas, while MPR in the open areas of Lake Taihu were relatively lower. The MPR in the sediments significantly varied from seasons, with the highest value of (42.85 ± 40.45) μmol/(L·d) in summer and the lowest of (5.26 ± 17.29) μmol/(L·d) in winter. The sediment MPR was positively correlated with the water temperature, the sediment water content, the porosity, the total nitrogen and the organic carbon. Differences of the temperature sensitivity (Q₁₀) for sediment MPR were found from different sampling sites. A significant negative logarithmic correlation between Q₁₀ and MPR was proofed. Microbial community analysis showed that hydrogenotrophic microorganisms dominated the methanogens in sediments of Lake Taihu during the summer. The copy number of the mcrA gene was significantly positively correlated with the sediment MPR. This study would provide important references to the studies of CH₄ production, emission and carbon cycle in Lake Taihu and the sediment MPR in other lakes.

Key words： Lake Taihu lake sediments methane production rate methane spatiotemporal variation

Received: 03 June 2024

PACS:

X524

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	LI Tong
	DING Li-fei
	WEI Wen-xin
	FAN Shi-ming
	LIU Cheng
	ZHONG Ji-cheng
	ZHANG Lei

Cite this article:

LI Tong,DING Li-fei,WEI Wen-xin等. Temporal and spatial variations of sediment methane production rates and their influencing factors in Lake Taihu[J]. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(1): 519-527.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2025/V45/I1/519

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