Fractionation of hydrogen, oxygen and carbon isotopes in n-alkanes and cellulose of three Sphagnum species

Brader, A.V.; Winden, Julia F. van; Bohncke, S.J.P.; Beets, C.; Reichart, Gert‐Jan; Leeuw, J.W. de

doi:10.1016/j.orggeochem.2010.09.006

Cited by 39 publications

(23 citation statements)

References 37 publications

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“…In modern bogs, the C 23 n-alkane can be depleted in 13 C (~5-10‰) relative to high molecular weight (C 29 -C 33 ) n-alkanes (Brader et al, 2010;Huang et al, 2014), suggesting incorporation of 13 C-depleted, CH 4 -derived CO 2 associated with aerobic methanotrophy . However, in other ombrotrophic bogs, the C 23 n-alkane does not exhibit 13 C-depleted values (− 30‰ to − 33‰; .…”

Section: Insights Into the Biogeochemistry Of Paleogene Ombrotrophic mentioning

confidence: 99%

Ecological and biogeochemical change in an early Paleogene peat-forming environment: Linking biomarkers and palynology

Inglis

Collinson

Riegel

et al. 2015

Palaeogeography, Palaeoclimatology, Palaeoecology

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Sphagnum moss is the dominant plant type in modern boreal and (sub)arctic ombrotrophic bogs and is of particular interest due to its sensitivity to climate and its important role in wetland biogeochemistry. Here we reconstruct the occurrence of Sphagnum moss -and associated biogeochemical change -within a thermally immature, early Paleogene (~55 Ma) lignite from Schöningen, NW Germany using a high-resolution, multi-proxy approach. Changes in the abundance of Sphagnum-type spores and the C 23 /C 31 n-alkane ratio indicate the expansion of Sphagnum moss within the top of the lignite seam. This Sphagnum moss expansion is associated with the development of waterlogged conditions, analogous to what has been observed within modern ombrotrophic bogs. The similarity between biomarkers and palynology also indicates that the C 23 /C 31 n-alkane ratio may be a reliable chemotaxonomic indicator for Sphagnum during the early Paleogene. The δ 13 C value of bacterial hopanes and mid-chain n-alkanes indicates that a rise in water table is not associated with a substantial increase in aerobic methanotrophy. The absence of very low δ 13 C values within the top of the seam could reflect either less methanogenesis or less efficient methane oxidation under waterlogged sulphate-rich conditions.

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Section: Insights Into the Biogeochemistry Of Paleogene Ombrotrophic mentioning

confidence: 99%

Ecological and biogeochemical change in an early Paleogene peat-forming environment: Linking biomarkers and palynology

Inglis

Collinson

Riegel

et al. 2015

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…3). Several authors had studied factors that might influence δ 13 C values such as vegetation speciesspecific pattern and photosynthetic fractionation (Smith and Epstein, 1971;Brader et al, 2010), but also the peat water content and temperature (Ménot and Burns, 2001), the nature of the microbial communities (Andrews et al, 2000) and the metabolic OM transformation (Blair et al, 1985). No OTC effect having been observed on plant communities, no impact of plant species and/or photosynthetic fractionation was to be expected.…”

Section: Otc-induced Warming Affects the Dynamics Of Water-extractablmentioning

confidence: 99%

Effects of short-term ecosystem experimental warming on water-extractable organic matter in an ombrotrophic Sphagnum peatland (Le Forbonnet, France)

Delarue

Laggoun‐Défarge

Buttler

et al. 2011

Organic Geochemistry

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International audienceIn a future warmer world, peatlands may change from a carbon sink function to a carbon source function. This study tracks changes in water-extractable organic matter (WEOM) after one year of in situ experimental warming using open top chambers (OTCs). WEOM was studied in the upper peat layers (0-10 cm) through analysis of water-extractable organic carbon (WEOC), stable C isotopic composition (δ13C), specific UV absorbance at 280 nm and sugar composition of cores taken from an open bog (DRY sites) and a transitional poor fen (WET sites). At the DRY sites, the impact of OTCs was weak with respect to WEOM parameters, whereas at the WET sites, the air warming treatment led to a decrease in peat water content, suggesting that the supply of heat by OTCs was used mainly for evapotranspiration. OTCs at the WET sites also induced a relative enrichment at the surface (0 to 5 cm depth) of aliphatic and/or aromatic compounds with concomitant decrease in WEOC, as a result of decomposition. On the contrary, WEOC and sugar content increased in the deeper peat layer (7.5-10 cm depth) probably as a result of increased leaching of phenolic compounds by roots, which then inhibits microbial activity. The different response to experimental warming at DRY and WET sites suggests that the spatial variability of moisture in is critical for understanding of the impact of global warming on the fate of OM and the carbon cycle in peatlands

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“…A faster temperature ramp rate could save analytical time, but a slower GC ramp rate could provide more efficient separation . In practice, researchers use different ramp rates in hydrogen isotope analysis . However, in recent experiments, we found that compound‐specific δ 2 H values could be varied by changing the ramp rate.…”

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confidence: 93%

Variation of compound‐specific hydrogen isotope ratios under changing temperature program in gas chromatography/thermal conversion/isotope ratio mass spectrometry

Liu

Zheng

Cui

et al. 2012

Rapid Comm Mass Spectrometry

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Higher pyrolysis efficiency could reduce the tailing of the H(2) peak and the related isotopic variations at increased GC temperature ramp rates. In addition, too slow a temperature ramp rate could broaden the peak width and thus increase the background effect and possible isotopic fractionations in the split interface; this could also influence the hydrogen isotope values. We therefore suggest that the appropriate temperature ramp rate is an important factor in improving the precision in analyzing compound-specific hydrogen isotopes.

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Fractionation of hydrogen, oxygen and carbon isotopes in n-alkanes and cellulose of three Sphagnum species

Cited by 39 publications

References 37 publications

Ecological and biogeochemical change in an early Paleogene peat-forming environment: Linking biomarkers and palynology

Ecological and biogeochemical change in an early Paleogene peat-forming environment: Linking biomarkers and palynology

Effects of short-term ecosystem experimental warming on water-extractable organic matter in an ombrotrophic Sphagnum peatland (Le Forbonnet, France)

Variation of compound‐specific hydrogen isotope ratios under changing temperature program in gas chromatography/thermal conversion/isotope ratio mass spectrometry

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