Abstract Determining the response of forest growth and productivity to climate variability is crucial for understanding and modeling forest carbon sequestration in mesic temperate forests. Most tree-ring analyses have used monthly climate data. Daily climate data may be more appropriate to use in the determination of tree-ring response to climate because cell division, enlargement, and thickening occur during discrete periods of the growing season. We analyze annual tree-ring width and δ13C from Tsuga canadensis (1992–2012) at ten sites in the northeastern US to test the null hypothesis that tree-ring width and δ13C respond similarly to critical climate periods using daily climate data and linear regression. There was a significant difference in the climate response of ring width and δ13C. Precipitation predicted both δ13C and ring width with the highest r2 and greatest level of significance overall. δ13C integrated climate over longer periods of the year (and previous year) than ring width at most sites. δ13C showed a more consistent seasonal signal across sites for each climate variable than ring width. Our work provides a new perspective on the response of annual tree growth and δ13C to climatic variability that can inform ecosystem productivity, carbon cycle, and earth system models.

中文翻译：

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树木年轮中的碳同位素比率对气候变化的反应与中温带森林中的树木年轮宽度不同

摘要 确定森林生长和生产力对气候变化的响应对于理解和模拟中温带森林中的森林碳固存至关重要。大多数树轮分析都使用了月度气候数据。每日气候数据可能更适合用于确定树木年轮对气候的响应，因为细胞分裂、扩大和增厚发生在生长季节的离散时期。我们分析了美国东北部十个地点的加拿大杉 (1992-2012) 的年度树轮宽度和 δ13C，以使用每日气候数据和线性回归测试树轮宽度和 δ13C 对关键气候期的响应类似的零假设。环宽和δ13C的气候响应存在显着差异。降水预测 δ13C 和环宽度，具有最高的 r2 和最高的总体显着性水平。δ13​​C 综合气候在一年中（和前一年）比在大多数地点的环宽更长。与环宽相比，δ13C 在每个气候变量的站点间显示出更一致的季节性信号。我们的工作为年度树木生长和 δ13C 对气候变化的响应提供了新的视角，可以为生态系统生产力、碳循环和地球系统模型提供信息。