Climate signal age effects in Pinus uncinata tree-ring density data from the Spanish Pyrenees

IF 2.1 3区农林科学 Q2 FORESTRY Trees Pub Date : 2025-01-15 DOI:10.1007/s00468-024-02598-3

Sophie Spelsberg, Ulf Büntgen, Inga K. Homfeld, Marcel Kunz, Edurne Martinez del Castillo, Ernesto Tejedor, Max Torbenson, Emanuele Ziaco, Jan Esper

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Key message

The temperature sensitivity of maximum latewood density measurements in pine trees from a high-elevation site in the Spanish Pyrenees increases with tree age. Detrending modulates the intensity of the effect.

Abstract

Tree-rings are the prime archive for high-resolution climate information over the past two millennia. However, the accuracy of annually resolved reconstructions from tree-rings can be constrained by what is known as climate signal age effects (CSAE), encompassing changes in the sensitivity of tree growth to climate over their lifespans. Here, we evaluate CSAE in Pinus uncinata from an upper tree line site in the Spanish central Pyrenees, Lake Gerber, which became a key location for reconstructing western Mediterranean summer temperatures at annual resolution. We use tree-ring width (TRW) and maximum latewood density (MXD) measurements from 50 pine trees with individual ages ranging from 7 to 406 years. For MXD, temperature sensitivity increases significantly (p < 0.01) with tree age from r = 0.31 in juvenile rings with a cambial age < 100 years to r = 0.49 in adult rings > 100 years. Similar CSAE are not detected in TRW, likely affected by the overall lower temperature signal (r_TRW = 0.45 vs. r_MXD = 0.81 from 1951 to 2020). The severity of CSAE is influenced by the approach used to remove ontogenetic trends, highlighting the need to assess and consider potential biases during tree-ring standardization. Our findings reveal CSAE to add uncertainty in MXD-based climate reconstructions in the Mediterranean. We recommend studying CSAE by sampling diverse age classes in dendroclimatic field campaigns.

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西班牙比利牛斯山黑松年轮密度数据的气候信号年龄效应

在西班牙比利牛斯山脉的一个高海拔地点测量的松树最大后期木材密度的温度敏感性随着树龄的增加而增加。去趋势调节效应的强度。摘要树木年轮是过去两千年来高分辨率气候信息的主要档案。然而，树木年轮的年度分辨率重建的准确性可能受到所谓的气候信号年龄效应（CSAE）的限制，该效应包括树木生长对其寿命期间气候敏感性的变化。在这里，我们评估了来自西班牙比利牛斯山脉中部Gerber湖上树线站点的uncinata松的CSAE，该站点成为以年分辨率重建地中海西部夏季温度的关键地点。我们利用50棵松树的年轮宽度（TRW）和最大迟木密度（MXD）测量数据，这些松树的树龄从7年到406年不等。对于MXD，随着树龄的增加，温度敏感性显著增加（p < 0.01），从形成层树龄为<； 100年的幼年轮r = 0.31增加到>； 100年的成年轮r = 0.49。在TRW中没有检测到类似的CSAE，可能受到整体较低温度信号的影响（从1951年到2020年，rTRW = 0.45, rMXD = 0.81）。CSAE的严重程度受到用于消除个体发生趋势的方法的影响，这突出了在树轮标准化过程中评估和考虑潜在偏差的必要性。我们的研究结果表明，CSAE在基于mxd的地中海气候重建中增加了不确定性。我们建议通过采样不同年龄段的树木气候野外活动来研究CSAE。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Trees 农林科学-林学

CiteScore

4.50

自引率

4.30%

发文量

113

审稿时长

3.8 months

期刊介绍： Trees - Structure and Function publishes original articles on the physiology, biochemistry, functional anatomy, structure and ecology of trees and other woody plants. Also presented are articles concerned with pathology and technological problems, when they contribute to the basic understanding of structure and function of trees. In addition to original articles and short communications, the journal publishes reviews on selected topics concerning the structure and function of trees.