首页|Evaluation of the non-climatic (age-related) trends of stable oxygen and carbon isotopes in Swiss stone pine (Pinus cembra L.) tree rings from the Eastern Carpathians, Romania
Evaluation of the non-climatic (age-related) trends of stable oxygen and carbon isotopes in Swiss stone pine (Pinus cembra L.) tree rings from the Eastern Carpathians, Romania
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NSTL
Elsevier
The presence, magnitude, and duration of age and/or size-related trends in the stable isotopes in tree-ring cel-lulose time series has been a subject of scientific debate. Where present, their evaluation and removal are key to the development of robust climate calibrations and reconstructions, especially in the low-frequency domain and where sample replication levels are low. Where reported, results suggest that the age/size/height-related trend of stable oxygen (618O) and carbon (613C) isotope compositions in tree-ring cellulose may vary according to the tree species and the individual tree location. For this reason, it is important when developing long palaeoclimate reconstructions for a new species, geographical region or ecological setting to perform studies to investigate non -climatic (age-related) trends. This study evaluates the ontogenetic pattern in the 618O and 613C data in Swiss stone pine trees from the Eastern Carpathians, Romania. For this, we used a new multi-centennial dataset consisting of 5 living and 10 relict Swiss stone pine samples collected from the Eastern Carpathians, which were annually resolved for 618O and 613C composition. Age-related trends were evaluated using the conventional "slope of the mean" approach as well as the "mean of the slope" method. The results suggest that neither the traditional "slope-of-the mean" nor the "mean-of-the-slope" approach indicates a persistent linear trend in the Swiss stone pine 618O data, while for the 613C data a systematic enrichment in 13C was observed over a < 40 year-long period after germination. Despite the limited sample size of this developing dataset these findings help to inform more detailed analyses and future sampling strategies in the Eastern Carpathian Swiss stone pine stands.
Age trendTree ring?13C?18OArolla pineTimberline forestSUMMER TEMPERATURE RECONSTRUCTIONEUROPEAN ALPSCELLULOSEDELTA-C-13SERIESCHRONOLOGYSUNSHINEHYDROGENRATIOSRECORD
Kern, Zoltan、Nagavciuc, Viorica、Hatvani, Istvan Gabor、Hegyi, Istvan Norbert、Loader, Neil J.、Popa, Ionel
NSTL
Elsevier
