藻源性有机质沉降对沉积物甲烷释放促进作用

张楠; 何凯; 钟继承; 安燕飞; 袁和忠; 张雷

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中国环境科学 ›› 2023, Vol. 43 ›› Issue (12) : 6641-6650.

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藻源性有机质沉降对沉积物甲烷释放促进作用

张楠^1,2, 何凯^2,3, 钟继承², 安燕飞³, 袁和忠¹, 张雷²

作者信息 +

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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摘要

采集巢湖西北湖湾区水与沉积物样品,模拟藻源性有机质沉降对CH₄ 释放的驱动作用.培养结果显示,加藻组CH₄ 释放通量(1.59±0.51)~(98.89±14.30) μmol/(m² · h)显著高于对照组(0.02±0.016)~(1.37±0.44) mmol/(m² · h)(P<0.001).培养过程中,藻源性有机质降解迅速,提供了大量产甲烷底物,溶解氧和硫酸根等电子受体减少,创造了有利产甲烷菌的环境,增加了产甲烷菌数量,尤其是乙酸营养型产甲烷菌.综上,藻源性有机质的大量输入,可以增大沉积物产甲烷速率和甲烷释放通量,其中乙酸营养型产甲烷菌起到重要作用.

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.

导出引用

张楠, 何凯, 钟继承, 安燕飞, 袁和忠, 张雷. 藻源性有机质沉降对沉积物甲烷释放促进作用[J]. 中国环境科学. 2023, 43(12): 6641-6650

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

中图分类号： X511

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