Staff Publications

Staff Publications

  • external user (warningwarning)
  • Log in as
  • language uk
  • About

    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

    We have a manual that explains all the features 

Record number 541019
Title Environmental and taxonomic controls of carbon and oxygen stable isotope composition in Sphagnum across broad climatic and geographic ranges
Author(s) Granath, Gustaf; Rydin, Håkan; Baltzer, Jennifer L.; Bengtsson, Fia; Boncek, Nicholas; Bragazza, Luca; Bu, Zhao Jun; Caporn, Simon J.M.; Dorrepaal, Ellen; Galanina, Olga; GaÅka, Mariusz; Ganeva, Anna; Gillikin, David P.; Goia, Irina; Goncharova, Nadezhda; Hájek, Michal; Haraguchi, Akira; Harris, Lorna I.; Humphreys, Elyn; Jiroušek, Martin; KajukaÅo, Katarzyna; Karofeld, Edgar; Koronatova, Natalia G.; Kosykh, Natalia P.; Lamentowicz, Mariusz; Lapshina, Elena; Limpens, Juul; Linkosalmi, Maiju; Ma, Jin Ze; Mauritz, Marguerite; Munir, Tariq M.; Natali, Susan M.; Natcheva, Rayna; Noskova, Maria; Payne, Richard J.; Pilkington, Kyle; Robinson, Sean; Robroek, Bjorn J.M.; Rochefort, Line; Singer, David; Stenøien, Hans K.; Tuittila, Eeva Stiina; Vellak, Kai; Verheyden, Anouk; Michael Waddington, James; Rice, Steven K.
Source Biogeosciences 15 (2018)16. - ISSN 1726-4170 - p. 5189 - 5202.
DOI https://doi.org/10.5194/bg-15-5189-2018
Department(s) Nature Conservation and Plant Ecology
WIMEK
Publication type Refereed Article in a scientific journal
Publication year 2018
Abstract

Rain-fed peatlands are dominated by peat mosses (Sphagnum sp.), which for their growth depend on nutrients, water and CO2 uptake from the atmosphere. As the isotopic composition of carbon (12,13C) and oxygen (16,18O) of these Sphagnum mosses are affected by environmental conditions, Sphagnum tissue accumulated in peat constitutes a potential long-term archive that can be used for climate reconstruction. However, there is inadequate understanding of how isotope values are influenced by environmental conditions, which restricts their current use as environmental and palaeoenvironmental indicators. Here we tested (i) to what extent C and O isotopic variation in living tissue of Sphagnum is species-specific and associated with local hydrological gradients, climatic gradients (evapotranspiration, temperature, precipitation) and elevation; (ii) whether the C isotopic signature can be a proxy for net primary productivity (NPP) of Sphagnum; and (iii) to what extent Sphagnum tissue δ18O tracks the δ18O isotope signature of precipitation. In total, we analysed 337 samples from 93 sites across North America and Eurasia using two important peat-forming Sphagnum species (S. magellanicum, S. fuscum) common to the Holarctic realm. There were differences in δ13C values between species. For S. magellanicum δ13C decreased with increasing height above the water table (HWT, R2 =17%) and was positively correlated to productivity (R2 = 7%). Together these two variables explained 46% of the between-site variation in δ13C values. For S. fuscum, productivity was the only significant predictor of δ13C but had low explanatory power (total R2 = 6%). For δ18O values, approximately 90% of the variation was found between sites. Globally modelled annual δ18O values in precipitation explained 69% of the between-site variation in tissue δ18O. S. magellanicum showed lower δ18O enrichment than S. fuscum (-0.83 ‰ lower). Elevation and climatic variables were weak predictors of tissue δ18O values after controlling for δ18O values of the precipitation. To summarize, our study provides evidence for (a) good predictability of tissue δ18O values from modelled annual δ18O values in precipitation, and (b) the possibility of relating tissue δ13C values to HWT and NPP, but this appears to be species-dependent. These results suggest that isotope composition can be used on a large scale for climatic reconstructions but that such models should be species-specific.

Comments
There are no comments yet. You can post the first one!
Post a comment
 
Please log in to use this service. Login as Wageningen University & Research user or guest user in upper right hand corner of this page.