铜绿微囊藻衰亡过程中产甲烷动态及关键影响因子

为探究铜绿微囊藻水华自然衰亡和水华堆积区藻快速衰亡对CH₄释放的影响，构建了室内模拟实验，研究了铜绿微囊藻自然衰亡和快速衰亡过程中水环境因子和CH₄、CO₂气体释放通量的变化。结果表明：高密度铜绿微囊藻衰亡中水环境因子和产气的变化遵循相似的时间模式，且衰亡对CH₄和CO₂的产生有显著的促进作用。自然衰亡和快速衰亡的CH₄累积释放量分别为对照组的22.80倍37.72倍，CO₂累积释放量分别为对照组的5.36倍和4.03倍。自然衰亡与快速衰亡的总碳（C）释放量差异不大，但快速衰亡释放的气体组分中CH₄的占比是自然衰亡的1.86倍。相关性分析表明，溶解性有机碳（DOC）是铜绿微囊藻衰亡中影响CH₄和CO₂释放的主导因子，且DOC中的芳香蛋白类物质和溶解性微生物代谢产物是CH₄和CO₂产生的主要底物来源。

Methane-producing dynamics and key influencing factors during the decay of Microcystis aeruginosa

An experiment was conducted to evaluate the effect of natural and rapid decay of Microcystis aeruginosa bloom on the production of CH₄, and the variations of water environmental factors as well as the release fluxes of CH₄ and CO₂ were also explored. The results indicated that the dynamics of water environmental factors and gas production during the decay of dense Microcystis aeruginosa followed a similar temporal pattern, and algal decay significantly promoted the production of CH₄ and CO₂. The CH₄ cumulative release of natural decay and rapid decay were 22.80 and 37.72 times that of control group respectively, and the CO₂ cumulative release of natural decay and rapid decay were 5.36 and 4.03 times that of control group respectively. There was little difference in total carbon (C) release between natural decay and rapid decay. However, the proportion of CH₄ in the gas released from rapid decay was 1.86 times that of natural decay. The correlation analysis revealed that dissolved organic carbon (DOC) was the dominant environmental factor affecting the release of CH₄ and CO₂. Moreover, the aromatic protein and soluble microbial metabolites of DOC were the main substrates for CH₄ and CO₂ production.