藻源性有机质沉降对沉积物甲烷释放促进作用

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Abstract Lakes are important natural sources of methane (CH₄) release. A well-known view is that frequent cyanobacterial blooms promote CH₄ release in freshwater lakes, but the specific driving process and mechanism are still unclear. In this study, the driving process and effect of algal-derived organic matter deposition on CH₄ release were simulated and studied by using water and sediment samples from Lake Chaohu. The results showed that the CH₄ release flux in the group with the treatment of additional added algae was (1.59±0.51)~(98.89±14.30) μmol/(m²·h)) significantly higher than that in the control group (0.02±0.016)~(1.37±0.44) μmol/(m²·h)) (P<0.001). During the simulating experiment, the degradation of algal-derived organic matter provided a large number of substrates for methane production while the reduction of electron acceptors such as dissolved oxygen and sulfate created an environment conducive to methanogens, which resulted in a massive proliferation of methanogens, especially acetic acid trophic methanogens. Our study clearly demonstrated that the large input of algal-derived organic matter increased the methane production rate and methane release flux of lake sediments with acetic acid trophic methanogens playing an important role.

Key words： emission flux methanogens greenhouse gases carbon dioxide lake algal bloom

Received: 16 April 2023

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	ZHANG Nan
	HE Kai
	ZHONG Ji-cheng
	AN Yan-fei
	YUAN He-zhong
	ZHANG Lei

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ZHANG Nan,HE Kai,ZHONG Ji-cheng等. Enhancement and mechanism of algal-derived organic matter deposition on lake sediment methane release[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(12): 6641-6650.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I12/6641

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