Stable carbon isotopic composition of peat columns, subsoil and vegetation on natural and forestry-drained boreal peatlands

Nykänen, Hannu; Mpamah, Promise; Rissanen, Antti J.

doi:10.1080/10256016.2018.1523158

Cited by 4 publications

(7 citation statements)

References 48 publications

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“…In Rahesuo, δ 13 C of the missing C from the layer above the synchronous ash layer was lower (δ 13 C, −30‰) than peat δ 13 C on the undrained site and clearly lower than the atmospheric CO 2 (δ 13 C,~−8 ‰, Rubino et al 2013). Thus, when respiration increases, the amount of 13 C-depleted CO 2 released from decaying peat increases in photosynthesis compared to atmospheric CO 2 (δ 13 C~− 8‰), leading to further 13 C-depletion of vegetation and surface peat (Nykänen et al 2018). However, this effect was not visible in Rahesuo.…”

Section: Effect Of Artificially Lowered Water Table On Peatmentioning

confidence: 87%

“…Using peat δ 13 C values as an indicator of changed environmental conditions Andersson et al (2012) and Esmeijer-Liu et al (2012) studied the δ 13 C stratigraphy of natural peatlands connected to different climatic periods or peatland development stages. The effect of water table lowering on the δ 13 C profiles has been studied on peatlands where the water table was lowered due to peat uplifting caused by permafrost formation (Krüger et al 2014), drainage for agriculture (Krüger et al 2015) and forestry (Krüger et al 2016;Nykänen et al 2018). A new approach in this study was the calculation of the absolute amounts of 13 C and 12 C by the same methods used earlier in C balance calculations (Minkkinen et al 1999;Pitkänen et al 2013;Krüger et al 2016).…”

Section: Discussionmentioning

confidence: 99%

“…A certified birch leaf standard (Elementar Microanalysis, UK) was used as a reference for C% and N% and also as an internal isotopic standard on Lsvec -LSB-19 scale (Coplen et al 2006). Peat samples were not acidified based on Nykänen et al (2018), where acidification did not change the peat δ 13 C values. The birch leaf standard was analyzed for δ 13 C, C% and N% after each 5 peat samples to correct for the analyzer drift, while linearity was checked in every run with variable concentration of C and N in standards corresponding to C and N amount of the samples.…”

Section: Peat Samplingmentioning

confidence: 99%

“…In addition to the primary atmospheric CO 2 source, secondary CO 2 sources also affect peat 13 C/ 12 C ratios (denoted as δ 13 C). Reuse of 13 Cdepleted respired CO 2 will deplete the fresh biomass (Jones et al 2014;Nykänen et al 2018). The same way, 13 C-depleted CO 2 derived from methane oxidation by methanotrophic symbionts in Sphagnum mosses leads to the formation of 13 C-depleted peat C (Raghoebarsing et al 2005, Larmola et al 2010.…”

Section: Introductionmentioning

confidence: 99%

“…The water and nutrient sources of bog vegetation depend on the precipitation and snow, leading to Sphagnum dominance. Sphagnum peat dominated bogs are 13 C-enriched compared to fens, where vascular plants dominate (Andersson et al 2012;Krüger et al 2016;Nykänen et al 2018). In addition to the primary atmospheric CO 2 source, secondary CO 2 sources also affect peat 13 C/ 12 C ratios (denoted as δ 13 C).…”

Section: Introductionmentioning

confidence: 99%

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Carbon storage change and δ13C transitions of peat columns in a partially forestry-drained boreal bog

et al. 2019

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Background and aims In forestry-drained peatlands, drying leads to changes in C cycling which could affect peat δ 13 C. Furthermore, the δ 13 C profile of the entire peat column may reveal effects of earlier climatic periods. Methods We measured peat δ 13 C and C inventories in adjacent peat profiles, two collected from undrained and two from the drained side of a bog that was partially ditch-drained 37 years earlier. The cores were sliced into 10-cm subsamples for analyses; matching of the profiles based on surface levelling, peat stratigraphic correlation and a horizontal ash layer found in both profiles. Results Surface subsidence of 30 cm was observed in the dried site and the uppermost 160 cm in the undrained site contained an excess of 5.9 kg m −2 of C compared with the corresponding strata of the ditch-drained site. The δ 13 C values increased but markedly only in the thin surface layer of the drained site, indicating low δ 13 C of the missing C (ca.-30‰). In the deeper strata, dating to Mid-Holocene, high dry bulk density, C%, N%, humification index and low C/N ratio were connected to low δ 13 C of peat. Conclusions Drainage of 37 years increased δ 13 C values in the upper peat profile of the drained bog and led to the selective loss of 13 C depleted C. Results indicate that C balance studies can be aided by C isotope analyses. Low δ 13 C values in the peat profile indicate the existence of a wet fen stage during the moist and warm period during Mid-Holocene.

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Section: Effect Of Artificially Lowered Water Table On Peatmentioning

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Section: Peat Samplingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Carbon storage change and δ13C transitions of peat columns in a partially forestry-drained boreal bog

et al. 2019

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Soil physico-chemical changes half a century after drainage and cultivation of the former Antela lake (Galicia, NW Spain)

González-Prieto

Romero-Estonllo²

2022

CATENA

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Falkland Island peatland development processes and the pervasive presence of fire

Mauquoy

Payne

Babeshko

et al. 2020

Quaternary Science Reviews

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Palaeoecological analyses of Falkland Island peat profiles have largely been confined to pollen analyses. In order to improve understanding of long-term Falkland Island peat development processes, the plant macrofossil and stable isotope stratigraphy of an 11,550 year Falkland Island Cortaderia pilosa ('whitegrass') peat profile was investigated. The peatland developed into an acid, whitegrass peatland via a poor fen stage. Macrofossil charcoal indicate that local fires have frequently occurred throughout the development of the peatland. Raman spectroscopy analyses indicate changes in the intensity of burning which are likely to be related to changes in fuel types, abundance of fine fuels due to reduced evapotranspiration/higher rainfall (under weaker Southern Westerly Winds), peat moisture and human disturbance. Stable isotope and thermogravimetric analyses were used to identify a period of enhanced decomposition of the peat matrices dating from ~7020 cal yr BP, which possibly reflects increasing strength of the Southern Westerly winds. The application of Raman spectroscopy and thermogravimetric analyses to the Falkland Island peat profile identified changes in fire intensity and decomposition which were not detectable using the techniques of macrofossil charcoal and plant macrofossil analyses.

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Stable carbon isotopic composition of peat columns, subsoil and vegetation on natural and forestry-drained boreal peatlands

Abstract: Stable carbon isotopic composition of peat columns, subsoiland vegetation on natural and forestry-drained boreal peatlands

Cited by 4 publications

References 48 publications

Carbon storage change and δ13C transitions of peat columns in a partially forestry-drained boreal bog

Carbon storage change and δ13C transitions of peat columns in a partially forestry-drained boreal bog

Soil physico-chemical changes half a century after drainage and cultivation of the former Antela lake (Galicia, NW Spain)

Falkland Island peatland development processes and the pervasive presence of fire

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