ABSTRACT: Multi-centennial- to millennial-long oak (Quercus spp.) tree-ring width (TRW) chronologies from living and relict wood are frequently used for climate reconstructions, but the amount of explained hydroclimatic variation remains relatively small. Although stable carbon and oxygen isotopic ratios (δ¹³C and δ¹⁸O values) in tree rings may offer enhanced climate sensitivity, our understanding of their paleoclimatic sensitivity is still limited by the general lack of well-replicated and high-resolution datasets. Here, we assessed the temperature, precipitation, and drought signal of annual δ¹³C and δ¹⁸O values and TRW measurements from 21 oaks growing under different ecological settings in the Czech Republic. Compared to the overall low climate sensitivity of TRW, the δ¹³C and δ¹⁸O chronologies revealed significant positive and negative correlations with March-August mean temperature and hydroclimate (for the period 1901-2018), respectively. Additional tests on the effect of sample size demonstrated robust climate sensitivity of the isotopic chronologies when non-pooled alpha cellulose from the latewood of at least 6 individual oaks was used. Our study suggests that oak stable isotopes are possibly the best high-resolution paleoclimatic proxy for the Central European lowlands, as well as any other temperate habitat where oak wood has historically been used as construction timber, and where traditional tree-ring parameters, such as TRW, tend to fail.

中文翻译：

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与环宽相比，非沉池橡木（Quercus spp。）稳定同位素显示出增强的气候敏感性

摘要：从生活木材和遗留木材中提取的百年至千禧年长橡树（Quercus spp。）年轮宽度（TRW）年代常用于气候重建，但解释的水文气候变化量仍然相对较小。虽然稳定的碳和氧同位素比率（δ ¹³ C和δ ^18个在树的年轮O值）可以提供增强的气候敏感性，我们及其古气候灵敏度的理解仍然是由普遍缺乏良好的复制和高分辨率的数据集的限制。在这里，我们评估了温度，降水和年度δ的干旱信号¹³ C和δ ¹⁸捷克共和国不同生态环境下生长的21棵橡树的O值和TRW测量值。相比TRW的δ整体低气候敏感性，¹³ C和δ ¹⁸O年表分别显示与3月至8月的平均温度和水文气候（1901-2018年）显着正相关和负相关。关于样本量影响的其他测试表明，当使用至少6棵独立橡树的来自晚材的非汇集α纤维素时，同位素时序对气候的敏感性很强。我们的研究表明，橡木稳定同位素可能是中欧低地以及历史上一直使用橡木作为建筑木材以及传统树木年轮参数的任何其他温带生境的最佳高分辨率古气候代名词。 TRW，往往会失败。