Stable carbon isotopes in soils as indicators of environmental change
Third-party funded project
Project title Stable carbon isotopes in soils as indicators of environmental change
Principal Investigator(s) Alewell, Christine
Co-Investigator(s) Leifeld, Jens
Organisation / Research unit Departement Umweltwissenschaften / Umweltgeowissenschaften (Alewell)
Project start 01.04.2015
Probable end 31.03.2016
Status Completed
Abstract

Peatlands act as a carbon sink in pristine status by accumulation of organic material in their water saturated soils. Peatland degradation could change a peatland from a carbon (C) sink into a carbon source due to altered decomposition processes. Our hypothesis is that stable carbon isotope depth profiles indicate peatland degradation such as drainage, climate change or land use change. Aerobic decomposition leads to an enrichment of 13C in aerated layers, whereas anaerobic conditions induce either a depletion of 13C due to an enrichment of recalcitrant material or a uniform depth trend due to very low degradation rates (Alewell et al., 2011). We took samples from ten peatlands in a transect from northern most Europe 200 km north of the polar circle down to the Black Forest in southern Germany with different degradation causes. Stable isotopes (δ13C and δ15N) as well as C and N content are analysed from peat samples. Our aim in the proposed continuation is to quantify the C loss from degraded peatland by the ash method described by Leifeld et al. (2011). Selected samples will be dated with 14C to know when the peat material was accumulated and to quantify the C loss by radiocarbon dates. Carbon accumulation rates will be calculated by peat ages and C stock in different depths of natural peatlands. With this and 14C dated peat layers in degraded sites we can estimate the C loss from the degraded peatland. Quantification of C loss by these methods will show if land use change/intensification trigger/enhance carbon loss from peatlands. Furthermore organic matter quality of peat material will be determined by infrared spectroscopy (Leifeld et al., 2012) to deduce the sensitivity of peatland C loss to organic matter quality. A comparison of stable isotope data with ash content, organic matter quality and 14C measurements will indicate if the isotope depth profiles are suitable indicators of peatland degradation.

 

Alewell, C. et al. (2011) Stable carbon isotopes as indicators for environmental change in palsa peats. Biogeosciences 8, 1769-1778.

Leifeld, J. et al. (2011) Organic matter losses from temperate ombrotrophic peatlands: an evaluation of the ash residue method. Plant and Soil 341, 349-361.

Leifeld, J. et al. (2012) Sensitivity of peatland carbon loss to organic matter quality. Geophysical Research Letters 39.

Financed by Swiss National Science Foundation (SNSF)

Published results ()

  ID Autor(en) Titel ISSN / ISBN Erschienen in Art der Publikation
2005358  Krüger, Jan Paul; Gerold, Gerhard; Beckedahl, Heinz; Jungkunst, Hermann F.  Effect of environmental conditions on methane and nitrous oxide fluxes of two South African wetlands    GEO-ÖKO  Publication: JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift) 
2204878  Krüger, Jan Paul; Beckedahl, Heinz; Gerold, Gerhard; Jungkunst, Hermann F.  Greenhouse gas emission peaks following natural rewetting of two wetlands in the southern Ukhahlamba-Drakensberg Park, South Africa  0373-6245 ; 2151-2418  South African Geographical Journal  Publication: JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift) 
3289582  Krüger, Jan Paul; Alewell, Christine  Stable isotopes as indicators of environmental change  978-87-93129-11-5  INTERACT Stories of Arctic Science  Publication: Book Item (Buchkap., Lexikonartikel, jur. Kommentierung, Beiträge in Sammelbänden etc.) 
3706896  Krüger, Jan-Paul  Peatland degradation indicated by stable isotope depth profiles and soil carbon loss      Publication: Thesis (Dissertationen, Habilitationen) 
   

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30/11/2022