Abstract. A recent analysis of stable isotopes of the Alpine Holocene Tree-Ring Dataset, consisting of samples from 192 larch and cembran pine trees, revealed that δD and δ¹⁸O exhibit no trends in adult trees, but evidence trends in the juvenile period of the first 100 years of cambial age. In this work we applied the Spearman statistical analysis on different cambial age classes to verify if these changes were correlated with tree-ring width values, that are known to show age trends. The results prove a significant correlation between tree-ring-width (TRW) and both hydrogen and oxygen stable isotopes before 100 year of cambial age, but not afterwards, in both larch and cembran pine. A trend in the correlation values was also found between the two water isotopes, while no trend was found in correlations involving δ¹³C. We hypothesized the δD and δ¹⁸O values reflect the higher xylogenesis activity of the juvenile period, that is associated with reduced atom exchanges of photosynthates with xylem water. The result indicates that the climate response of δD and δ¹⁸O may differ in the juvenile and mature period of tree life at treeline.

中文翻译：

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树线型针叶树木材样品中稳定同位素与树轮宽度的冈比亚年龄相关性

摘要。稳定的最近的分析同位素高山全新世树木年轮数据集，其中包括来自192落叶松和瑞士五松树样本，揭示了δD和δ ¹⁸O在成年树上没有显示趋势，但是在冈比亚年龄的前100年的少年时期有明显趋势。在这项工作中，我们将Spearman统计分析应用于不同的冈比亚年龄类别，以验证这些变化是否与已知可显示年龄趋势的年轮宽度值相关。结果证明在落叶松和天柏松中，树龄宽度（TRW）与成年年龄之前的100年的氢和氧稳定同位素之间存在显着相关性，但此后则没有。在相关值的一个趋势也两个水同位素之间发现，虽然没有趋势在涉及δ相关性发现¹³ C.我们假设的δD和δ ¹⁸O值反映了幼年期较高的木糖生成活性，这与光合产物与木质部水的原子交换减少有关。结果表明，δD的气候响应和δ ¹⁸ O可能会在少年不同，并且在树线成熟树生命的时期。