DOI: 10.1007/s10533-016-0206-8
Scopus记录号: 2-s2.0-84963685657
论文题名: Methane dynamics in subtropical freshwater reservoirs and the mediating microbial communities
作者: Musenze R.S. ; Fan L. ; Grinham A. ; Werner U. ; Gale D. ; Udy J. ; Yuan Z.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2016
卷: 128, 期: 2018-01-02 起始页码: 233
结束页码: 255
语种: 英语
英文关键词: Archaea
; CH4
; Freshwater reservoir
; Lake
; Methane
; Methane emission
; Methanogen
; Methanogenesis
; Methanotroph
; Methanotrophy
; pmoA
; Stratification
; Subtropical
Scopus关键词: concentration (composition)
; dissolved oxygen
; forested catchment
; freshwater environment
; grassland
; greenhouse gas
; methane
; methanogenesis
; methanotrophy
; microbial community
; reservoir
; stratification
; subtropical region
; water column
; Australia
; Queensland
英文摘要: Methane (CH4) is a potent greenhouse gas of primarily biogenic origin. Aquatic systems are significant CH4 sources but uncertainty surrounds their estimated source strengths. There is limited understanding of CH4 concentrations variability in both space and time (dynamics) and the responsible drivers. Water column CH4 dynamics were investigated in three subtropical freshwater reservoirs in Southeast Queensland, Australia, during four seasons in 2011–2012. The reservoirs (Little Nerang Dam-LND, Lake Baroon-LB and Lake Wivenhoe-LW) are of different sizes and characteristics. Overall, CH4 concentrations were significantly higher in the strongly stratified LND (0.03–361 µM) with a more forested catchment and sheltered landscape, intermediate in LB (0.05–220 µM) and lowest in the relatively well-mixed LW (0.04–150 µM) in a more open grassland landscape. CH4 concentrations were highest in summer and spring when the reservoirs were strongly stratified and lowest in winter when the reservoirs were more mixed with deeper dissolved oxygen penetration. Concentrations were also highest in the anoxic water column and often had minima at the oxycline when stratification occurred. Highest CH4 concentrations were predominantly at the sediment–water interface but there were indications of high CH4 production within the anoxic water column in both LB and LND. Moderate CH4 peaks were consistently observed in the oxic subsurface water in all reservoirs likely increasing diffusive CH4 fluxes. DO was a strong proxy for methanotrophy while methanogenesis was best indicated by the oxidation–reduction potential of the water column. Microbial community analysis revealed methanotrophs throughout the water column but methanogenic Archaea mainly proliferated below the oxycline. This is the first comprehensive field-based study towards understanding of CH4 dynamics in subtropical freshwater systems. © 2016, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83409
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Advanced Water Management Centre, The University of Queensland, Brisbane, Qld, Australia; Department of Civil and Environmental Engineering, Makerere University, P.O. Box 7062, Kampala, Uganda; School of Civil Engineering, The University of Queensland, Brisbane, Qld, Australia; Seqwater, P.O. Box 15236, City East, Qld, Australia; Healthy Waterways Ltd, P.O. Box 13086, George Street, Brisbane, Qld, Australia
Recommended Citation:
Musenze R.S.,Fan L.,Grinham A.,et al. Methane dynamics in subtropical freshwater reservoirs and the mediating microbial communities[J]. Biogeochemistry,2016-01-01,128(2018-01-02)