太湖沉积物-水界面甲烷扩散通量时空变化特征

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Abstract A year-long study was conducted in Taihu Lake with the objective of investigate the diffusive fluxes of methane (CH₄) across the sediment-water interface in different ecological zones, namely the algal bloom zone, the macrophyte zone, and the open water zone. The CH₄ concentrations in the sediment porewaters and the relevant fluxes at the sediment-water interface from different ecological zones of the lake were analyzed and evaluated. Results showed that CH₄ concentrations in porewaters increased with the sediment depth. The CH₄ concentrations in the open water zone were found significantly lower than that in the other zones. The organic carbon was identified as the key factor driving the spatial and temporal variations of CH₄. The mean diffusive fluxes of CH₄ across the sediment-water interface were 122.56±32.2, 108.75±23.8, and 3.36±0.6 μmol/(m²·d) in the algal bloom zone, the macrophyte zone, and the open water zone, respectively, with the open water zone showing the significantly lower fluxes. Seasonal variations of CH₄ fluxes were observed in the lake while the fluxes were significantly higher in the spring and the summer than the other two seasons. The regression result showed that the CH₄ flux was strongly influenced by the CH₄ concentration in the porewater and the sediment porosity. Our study also demonstrated that algal blooms and macrophyte reproductions enhanced CH₄ concentrations in porewaters and significantly increased the diffusive CH₄ fluxes across the sediment-water interface in Lake Taihu.

Key words： Lake Taihu methane diffusive flux sediment-water interface greenhouse gas

Received: 26 August 2024

PACS:

X131.1

Corresponding Authors: 张雷,副研究员,leizhang@niglas.ac.cn E-mail: leizhang@niglas.ac.cn

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	DING Li-fei
	LI Tong
	WEI Wen-xin
	YAO En-qin
	ZHONG Ji-cheng
	YUAN He-zhong
	ZHANG Lei

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DING Li-fei,LI Tong,WEI Wen-xin等. Spatial and temporal variations of methane diffusive fluxes across the sediment-water interface in Lake Taihu[J]. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(3): 1474-1482.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2025/V45/I3/1474

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