DOI: 10.5194/hess-21-4283-2017
Scopus记录号: 2-s2.0-85028597432
论文题名: Carbon isotopes of dissolved inorganic carbon reflect utilization of different carbon sources by microbial communities in two limestone aquifer assemblages
作者: Nowak M ; E ; , Schwab V ; F ; , Lazar C ; S ; , Behrendt T ; , Kohlhepp B ; , Totsche K ; U ; , Küsel K ; , Trumbore S ; E
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2017
卷: 21, 期: 9 起始页码: 4283
结束页码: 4300
语种: 英语
Scopus关键词: Aquifers
; Biogeochemistry
; Biological materials
; C (programming language)
; Carbon
; Carbonation
; Chemical analysis
; Dissolution
; Groundwater
; Groundwater resources
; Hydrogeology
; Isotopes
; Limestone
; Microorganisms
; Organic carbon
; Organic compounds
; RNA
; Sedimentary rocks
; Carbonate equilibriums
; Chemolithoautotrophic
; Different carbon sources
; Dissolved inorganic carbon
; Microbial community structures
; Quantitative estimates
; Sedimentary organic matter
; Water rock interactions
; Hydrochemistry
; abiotic factor
; aquifer
; bacterium
; biotic factor
; carbon isotope
; community structure
; dissolved inorganic carbon
; graphical method
; groundwater
; hydrogeology
; limestone
; marl
; microbial activity
; microbial community
; organic matter
; oxidation
; water chemistry
; water-rock interaction
; Germany
; Germany
; Hainich
; Thuringia
英文摘要: Isotopes of dissolved inorganic carbon (DIC) are used to indicate both transit times and biogeochemical evolution of groundwaters. These signals can be complicated in carbonate aquifers, as both abiotic (i.e., carbonate equilibria) and biotic factors influence the σ13C and 14C of DIC. We applied a novel graphical method for tracking changes in the σ13C and 14C of DIC in two distinct aquifer complexes identified in the Hainich Critical Zone Exploratory (CZE), a platform to study how water transport links surface and shallow groundwaters in limestone and marlstone rocks in central Germany. For more quantitative estimates of contributions of different biotic and abiotic carbon sources to the DIC pool, we used the NETPATH geochemical modeling program, which accounts for changes in dissolved ions in addition to C isotopes. Although water residence times in the Hainich CZE aquifers based on hydrogeology are relatively short (years or less), DIC isotopes in the shallow, mostly anoxic, aquifer assemblage (HTU) were depleted in 14C compared to a deeper, oxic, aquifer complex (HTL). Carbon isotopes and chemical changes in the deeper HTL wells could be explained by interaction of recharge waters equilibrated with post-bomb 14C sources with carbonates. However, oxygen depletion and σ13C and 14C values of DIC below those expected from the processes of carbonate equilibrium alone indicate considerably different biogeochemical evolution of waters in the upper aquifer assemblage (HTU wells). Changes in 14C and 13C in the upper aquifer complexes result from a number of biotic and abiotic processes, including oxidation of 14C-depleted OM derived from recycled microbial carbon and sedimentary organic matter as well as water-rock interactions. The microbial pathways inferred from DIC isotope shifts and changes in water chemistry in the HTU wells were supported by comparison with in situ microbial community structure based on 16S rRNA analyses. Our findings demonstrate the large variation in the importance of biotic as well as abiotic controls on 13C and 14C of DIC in closely related aquifer assemblages. Further, they support the importance of subsurface-derived carbon sources like DIC for chemolithoautotrophic microorganisms as well as rock-derived organic matter for supporting heterotrophic groundwater microbial communities and indicate that even shallow aquifers have microbial communities that use a variety of subsurface-derived carbon sources. © Author(s) 2017. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79077
Appears in Collections: 气候变化事实与影响
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作者单位: Department for Biogeochemical Processes, Max-Planck Institute for Biogeochemistry, Hans-Knöll Straße 10, Jena, Germany; Department of Hydrogeology, Institute of Geosciences, Friedrich Schiller University Jena, Burgweg 11, Jena, Germany; Aquatic Geomicrobiology, Institute of Ecology, Friedrich Schiller University Jena, Dornburger Str. 159, Jena, Germany; German Centre for Integrative Biodiversity Research (iDiv), Halle-Jena-Leipzig, Leipzig, Germany; Bavarian Environment Agency, Hans-Högn-Straße 12, Hof, Germany
Recommended Citation:
Nowak M,E,, Schwab V,et al. Carbon isotopes of dissolved inorganic carbon reflect utilization of different carbon sources by microbial communities in two limestone aquifer assemblages[J]. Hydrology and Earth System Sciences,2017-01-01,21(9)