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Environmental and taxonomic controls of carbon and oxygen stable isotope composition in Sphagnum across broad climatic and geographic ranges

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GRANATH Gustaf RYDIN Hakan BALTZER J.L. BENGTSSON F. BONCEK N. BRAGAZZA L. BU Z.J. CAPORN S.J.M DORREPAAL E. GALANINA O. GAŁKA M. GANEVA A. GILLIKIN D.P. GOIA I. GONCHAROVA N. HÁJEK Michal HARAGUCHI A. HARRIS L.I. HUMPHREYS E. JIROUŠEK Martin KAJUKAŁO K. KAROFELD E. KORONATOVA N.G KOSYKH N.P. LAMENTOWICZ Mariusz Grzegorz LAPSHINA E. LIMPENS J. LINKOSALMI M. JIN-ZE Ma MAURITZ M. MUNIR T.M. NATALI S.M. NATCHEVA R. NOSKOVA M. PAYNE R.J. PILKINGTON K. ROBINSON S. ROBROEK B.J.M. ROCHEFORT L. SINGER D. STENOIEN H.K. TUITTILA E.S. VELLAK K. VERHEYDEN A. WADDINGTON J.M. RICE S.K.

Rok publikování 2018
Druh Článek v odborném periodiku
Časopis / Zdroj Biogeosciences
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
Doi http://dx.doi.org/10.5194/bg-15-5189-2018
Klíčová slova MIXED-EFFECTS MODELS; WATER-CONTENT; TESTATE AMEBAS; FUSCUM PEAT; PHOTOSYNTHESIS; CELLULOSE; MOSS; DISCRIMINATION; FRACTIONATION; VARIABILITY
Popis We analysed two important peat-forming Sphagnum species (S. magellanicum, S. fuscum) samples from 93 sites across North America and Eurasia. There were differences in delta13C values between species. For S. magellanicum delta13C decreased with increasing height above the water table and was positively correlated to productivity. Together these two variables explained 46% of the between-site variation in delta13C values. For S. fuscum, productivity was the only significant predictor of delta13C but had low explanatory power. For delta18O values, approximately 90% of the variation was found between sites. Globally modelled annual delta18O values in precipitation explained 69% of the between-site variation in tissue delta18O. S. magellanicum showed lower delta18O enrichment than S. fuscum. Elevation and climatic variables were weak predictors of tissue delta18O values after controlling for delta18O values of the precipitation. To summarize, our study provides evidence for (a) good predictability of tissue delta18O values from modelled annual delta18O values in precipitation, and (b) the possibility of relating tissue delta13C 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.

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