ABSTRACT
δ13C and δ18O values from sapwood of a single Pinus uncinata tree, from a high elevation site in the Spanish Pyrenees, were determined to evaluate the differences between whole wood and resin-free whole wood. This issue is addressed for the first time with P. uncinata over a 38-year long period. Results are also compared with published isotope values of α-cellulose samples from the same tree. The differences in δ13C and δ18O between whole wood and resin-free whole wood vary within the analytical uncertainty of 0.3 and 0.5 ‰, respectively, indicating that resin extraction is not necessary for sapwood of P. uncinata. Mean differences between cellulose and whole wood are 0.9 ‰ (δ13C) and 5.0 ‰ (δ18O), respectively. However, further analyses of different species and other sites are needed to evaluate whether the findings reported here are coherent more generally.
Acknowledgements
We would like to thank B. Müller for the δ13C analyses, M. Kochbeck, J. Helms, L. Klippel, and P. Römer for sample preparation and laboratory work.
Disclosure statement
No potential conflict of interest was reported by the authors.
Notes
* The topic of this manuscript was presented as part of an oral presentation on the Annual Meeting of the German Association for Stable Isotope Research (GASIR), 28–30 September 2015, Heidelberg, Germany.