Isotope composition of bulk carbon in replicated Sphagnum peat cores from three Central European high-elevation wetlands

Novák, Martin; Zemanova, Leona; Jačková, Ivana; Bůzek, František; Adamová, Marie

doi:10.2343/geochemj.1.0026

Cited by 6 publications

(6 citation statements)

References 22 publications

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“…Similar results were reported by Loisel et al (2009Loisel et al ( , 2010. The complex relationship between environmental conditions (e.g., water level and additional CO 2 resulting from organic matter decomposition by bacterial activity) could explain partly these results (Loisel et al, 2009;Novak et al, 2009;Markel et al, 2010). While the environmental controls on carbon isotope fractionation in peat moss is not well understood (Loisel et al, 2009), the peat bog d 13 C proxy may be used regionally in cross correlations.…”

Section: Samplesupporting

confidence: 79%

A Late Holocene environmental history of a bat guano deposit from Romania: an isotopic, pollen and microcharcoal study

Forray

Onac

Tanţău

et al. 2015

Quaternary Science Reviews

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Section: Samplesupporting

confidence: 79%

A Late Holocene environmental history of a bat guano deposit from Romania: an isotopic, pollen and microcharcoal study

Forray

Onac

Tanţău

et al. 2015

Quaternary Science Reviews

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“…The Holocene 24(1) represent an archive of the past environmental variations (Akagi et al, 2004;Alewell et al, 2011;Jędrysek and Skrzypek, 2005;Novak et al, 2009;Skrzypek et al, 2008).…”

Section: Research Paper 16mentioning

confidence: 99%

“…During the last decade, several studies have demonstrated the potential of stable isotopes (δ 18 O, δ 13 C, δ 2 H, δ 15 N, δ 34 S) in peat bogs as proxies for climatic change, such as temperature, humidity, and/or precipitation shifts, and to reconstruct Holocene climate at various timescales (Daley et al, 2009; Loader et al, 2007; Loisel et al, 2009, 2010; McClymont et al, 2010; Ménot and Burns, 2001; Ménot-Combes et al, 2002; Moschen et al, 2009; Pancost et al, 2003; Price et al, 1997). It was shown that the original isotope composition of plants are in general preserved in the peat, especially in cold climate and acidic environments, and represent an archive of the past environmental variations (Akagi et al, 2004; Alewell et al, 2011; Jędrysek and Skrzypek, 2005; Novak et al, 2009; Skrzypek et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

“…A number of studies focused on bulk peat material to infer environmental and/or climatic changes over time (Akagi et al, 2004; Alewell et al, 2011; Esmeijer-Liu, 2012; Jędrysek and Skrzypek, 2005; Novak et al, 1999, 2009; Pancost et al, 2003). Carbon isotopic measurements of bulk peat could be problematic because several components (sedges, mosses, etc.)…”

Section: Introductionmentioning

confidence: 99%

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Carbon isotope composition as indicator for climatic changes during the middle and late Holocene in a peat bog from Maramureş Mountains (Romania)

et al. 2013

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The main goal of this study was to use stable carbon isotopic composition of bulk peat sampled in Tăul Mare-Bardău peat bog, Maramureş Mountains, as a tool to provide paleoclimatic information over the middle and late Holocene in this region. A peat core of 3.60 m was sampled for δ13C analysis, and bulk peat samples were analyzed by isotope ratio mass spectrometry (IRMS) method. δ13C values reveal a maximum variation of 4.69‰ along a 3.6-m-long peat core. We examined the vertical variation of δ13C bulk peat and concluded that several factors could contribute to up core trends of δ13C. Four intervals of climatic variability could be related with variations of δ13C values between ~6800 cal. yr BP and present: two wet periods (around 2800 and 545 cal. yr BP) and two dry periods (6760 and 1430 cal. yr BP). We concluded that variability in the δ13C of bulk peat profile could be influenced most heavily by the water availability, which in turn is related to the amount of precipitation at the time. Four intervals of δ13C variations of the peat sequence between 225 and 25 cm can be related with generally accepted intervals of climatic variability that have occurred within the last 2000–2500 years (‘Roman Warm Period’ (RWP), ‘Dark Age Cold Period’ (DACP), ‘Medieval Warm Period’ (MWP) and ‘Little Ice Age’ (LIA)). The climate was probably of warm–cold alternations, as revealed in our peat core by δ13C variations between 2800 cal. yr BP and present. The δ13C values of the peat profile showed two positive signals at 40 and 225 cm depth and two negative signals at 105 and 350 cm depth. We suggest that these could also represent a change in vegetation at the time.

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“…Biogeochemical processes at UHL have been studied by Novak et al (2005), Sanda and Cislerova (2009), Bohdalkova et al (2014), Marx et al (2017), Oulehle et al (2017Oulehle et al ( , 2021a, and Vitvar et al (2022). Further information on MMJ is given in Novak et al (2003Novak et al ( , 2009. (Novak et al, 2015b).…”

Section: Study Sitesmentioning

confidence: 99%

Contrasting potential for biological N₂ fixation at three polluted central European Sphagnum peat bogs: combining the ¹⁵N₂-tracer and natural-abundance isotope approaches

Stepanova,

Novak,

Cejkova

et al. 2023

SOIL

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Abstract. Availability of reactive nitrogen (Nr) is a key control on carbon (C) sequestration in wetlands. To complement the metabolic demands of Sphagnum in pristine rain-fed bogs, diazotrophs supply additional Nr via biological nitrogen fixation (BNF). As breaking the triple bond of atmospheric N2 is energy-intensive, it is reasonable to assume that increasing inputs of pollutant Nr will lead to BNF downregulation. However, recent studies have also documented measurable BNF rates in Sphagnum-dominated bogs in polluted regions, indicating the adaptation of N2 fixers to changing N deposition. Our aim was to quantify BNF in high-elevation peatlands located in industrialized central Europe. A 15N2-tracer experiment was combined with a natural-abundance N-isotope study at three Sphagnum-dominated peat bogs in the northern Czech Republic in an attempt to assess the roles of individual BNF drivers. High short-term BNF rates (8.2 ± 4.6 g N m2 d−1) were observed at Malé mechové jezírko, which receives ∼ 17 kg Nr ha−1 yr−1. The remaining two peat bogs, whose recent atmospheric Nr inputs differed from Malé mechové jezírko by only 1–2 kg ha−1 yr−1 (Uhlír̆ská and Brumiště), showed zero BNF. The following parameters were investigated to elucidate the BNF difference: the NH4+-N / NO3--N ratio, temperature, wetness, Sphagnum species, organic-N availability, possible P limitation, possible molybdenum (Mo) limitation, SO42- deposition, and pH. At Malé mechové jezírko and Uhlír̆ská, the same moss species (S. girgensohnii) was used for the 15N2 experiment; therefore, the host identity could not explain the difference in BNF at these sites. Temperature and moisture were also identical in all incubations and could not explain the between-site differences in BNF. The N : P stoichiometry in peat and bog water indicated that Brumiště may have lacked BNF due to P limitation, whereas non-detectable BNF at Uhlír̆ská may have been related to the 70-fold higher SO42- concentration in bog water. Across the sites, the mean natural-abundance δ15N values increased in the following order: atmospheric deposition (−5.3 ± 0.3 ‰) < Sphagnum (−4.3 ± 0.1 ‰) < bog water (−3.9 ± 0.4 ‰) < atmospheric N2 (0.0 ‰). Only at Brumiště was N in Sphagnum significantly isotopically heavier than in atmospheric deposition, possibly indicating a longer-term BNF effect. Collectively, our data highlight spatial heterogeneity in BNF rates under high Nr inputs as well as the importance of environmental parameters other than atmospheric Nr pollution in regulating BNF.

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Isotope composition of bulk carbon in replicated Sphagnum peat cores from three Central European high-elevation wetlands

Cited by 6 publications

References 22 publications

A Late Holocene environmental history of a bat guano deposit from Romania: an isotopic, pollen and microcharcoal study

A Late Holocene environmental history of a bat guano deposit from Romania: an isotopic, pollen and microcharcoal study

Carbon isotope composition as indicator for climatic changes during the middle and late Holocene in a peat bog from Maramureş Mountains (Romania)

Contrasting potential for biological N₂ fixation at three polluted central European Sphagnum peat bogs: combining the ¹⁵N₂-tracer and natural-abundance isotope approaches

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Isotope composition of bulk carbon in replicated Sphagnum peat cores from three Central European high-elevation wetlands

Cited by 6 publications

References 22 publications

A Late Holocene environmental history of a bat guano deposit from Romania: an isotopic, pollen and microcharcoal study

A Late Holocene environmental history of a bat guano deposit from Romania: an isotopic, pollen and microcharcoal study

Carbon isotope composition as indicator for climatic changes during the middle and late Holocene in a peat bog from Maramureş Mountains (Romania)

Contrasting potential for biological N2 fixation at three polluted central European Sphagnum peat bogs: combining the 15N2-tracer and natural-abundance isotope approaches

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Contrasting potential for biological N₂ fixation at three polluted central European Sphagnum peat bogs: combining the ¹⁵N₂-tracer and natural-abundance isotope approaches