Enhancement and mechanism of algal-derived organic matter deposition on lake sediment methane release

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

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China Environmental Science ›› 2023, Vol. 43 ›› Issue (12) : 6641-6650.

Carbon Emission Control

Enhancement and mechanism of algal-derived organic matter deposition on lake sediment methane release

ZHANG Nan^1,2, HE Kai^2,3, ZHONG Ji-cheng², AN Yan-fei³, YUAN He-zhong¹, ZHANG Lei²

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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

algal bloom / carbon dioxide / emission flux / greenhouse gases / lake / methanogens

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ZHANG Nan, HE Kai, ZHONG Ji-cheng, AN Yan-fei, YUAN He-zhong, ZHANG Lei. Enhancement and mechanism of algal-derived organic matter deposition on lake sediment methane release[J]. China Environmental Science. 2023, 43(12): 6641-6650

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