DOI: 10.1007/s10533-014-0044-5
Scopus记录号: 2-s2.0-84921774792
论文题名: Sea spray, trace elements, and decomposition patterns as possible constraints on the evolution of CH4 and CO2 concentrations and isotopic signatures in oceanic ombrotrophic bogs
作者: Broder T. ; Blodau C. ; Biester H. ; Knorr K.H.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 122, 期: 2018-02-03 起始页码: 327
结束页码: 342
语种: 英语
英文关键词: Carbon mineralization
; Decomposition
; Methanogenesis
; Micronutrients
; Patagonia
; Peatlands
; Stable isotopes
Scopus关键词: carbon dioxide
; decomposition
; isotopic analysis
; methane
; mineralization
; ombrotrophic environment
; peatland
; precipitation (climatology)
; stable isotope
; trace element
; Patagonia
英文摘要: Ombrotrophic, oceanic bogs in southern Patagonia have not yet been studied with respect to ongoing belowground organic matter decomposition. To obtain such information we analyzed three sites differing in precipitation and sea spray input and quantified concentration patterns and 12/13C isotopic composition of CO2 and CH4 and iron, sulfur and trace metal contents that can influence decomposition. Concentrations of CO2 and CH4 increased with depth and reached 4,000–6,000 µmol L−1 of CO2 and 500–1,400 µmol L−1 of CH4. Chamber surface fluxes ranged from 40 to 62 mmol m−2 day−1 for CO2 and were not detectable for CH4 (<0.2 mmol m−2 day−1). Lowest gaseous C concentrations and fluxes occurred at the driest site under high sea spray input, which was accompanied by a higher degree of decomposition. Isotope fractionation factors αc ranged from 1.047 to 1.077 and suggested a predominance of hydrogenotrophic methanogenesis. The lower CH4 concentrations at one particular site may have been caused by a number of processes but isotope mass balances indicated a preferential loss of CH4 at all sites, especially at the site of lowest CH4 concentrations. Low CH4 concentrations were found under a high sea spray input and higher sulfate and reduced inorganic sulfur contents, suggesting a potential for attenuation of methanogenesis by sulfate reduction. All sites were characterized by very low Nickel concentrations of mostly <15 nmol L−1 and low concentrations of other essential trace elements that may further inhibit methanogenesis but also methanotrophy. The Patagonian sites fell within the reported range of CO2 and CH4 concentrations and depth patterns, and isotopic composition of the gases at northern sites despite different vegetation composition and seemingly lower surface fluxes. Fairly high sulfate and low trace element concentrations due to differences in atmospheric deposition may locally modify the decomposition patterns. © 2014, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83567
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: Limnological Research Station and Department of Hydrology, University of Bayreuth, Bayreuth, Germany; Geochemistry Group, Institute for Geoecology, TU Braunschweig, Braunschweig, Germany; School of Environmental Sciences, University of Guelph, Guelph, ON, Canada; Hydrology Group, Institute of Landscape Ecology, FB 14 Geosciences, University of Münster, Münster, Germany
Recommended Citation:
Broder T.,Blodau C.,Biester H.,et al. Sea spray, trace elements, and decomposition patterns as possible constraints on the evolution of CH4 and CO2 concentrations and isotopic signatures in oceanic ombrotrophic bogs[J]. Biogeochemistry,2015-01-01,122(2018-02-03)