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主办单位:重庆大学
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铜绿微囊藻衰亡过程中产甲烷动态及关键影响因子
刘艺, 许浩廉, 毛羽丰, 李宏, 艾海男, 何强
重庆大学 三峡库区生态环境教育部重点实验室, 重庆 400045
摘要:
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。
关键词:  铜绿微囊藻  衰亡  甲烷  二氧化碳  藻源有机质
DOI:10.11835/j.issn.2096-6717.2019.104
分类号:X524
基金项目:国家自然科学基金(51779020、51609024、51478061)
Methane-producing dynamics and key influencing factors during the decay of Microcystis aeruginosa
Liu Yi, Xu Haolian, Mao Yufeng, Li Hong, Ai Hainan, He Qiang
Key Laboratory of the Three Gorges Reservoir Regions Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, P. R. China
Abstract:
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.
Key words:  Microcystis aeruginosa  decay  methane  carbon dioxide  algal organic matter
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