Department of Environmental, Biological and Pharmaceutical Sciences and Technologies, University of Campania 'L. Vanvitelli', Via Vivaldi 43, 81100, Caserta, Italy.
The Earth Institute, Tree-Ring Laboratory, Lamont-Doherty Earth Observatory of Columbia University, New York, 10964, USA.
Sci Rep. 2023 Jul 29;13(1):12294. doi: 10.1038/s41598-023-39610-8.
Intra-Annual Density Fluctuations (IADFs) are an important wood functional trait that determine trees' ability to adapt to climatic changes. Here, we use a large tree-ring database of 11 species from 89 sites across eight European countries, covering a climatic gradient from the Mediterranean to northern Europe, to analyze how climate variations drive IADF formation. We found that IADF occurrence increases nonlinearly with ring width in both gymnosperms and angiosperms and decreases with altitude and age. Recently recorded higher mean annual temperatures facilitate the formation of IADFs in almost all the studied species. Precipitation plays a significant role in inducing IADFs in species that exhibit drought tolerance capability, and a growth pattern known as bimodal growth. Our findings suggest that species with bimodal growth patterns growing in western and southern Europe will form IADFs more frequently, as an adaptation to increasing temperatures and droughts.
年内密度波动（IADFs）是一个重要的木材功能特性，决定了树木适应气候变化的能力。在这里，我们利用来自欧洲八个国家 89 个地点的 11 个树种的大型树木年轮数据库，分析气候变异如何驱动 IADF 的形成。我们发现，在裸子植物和被子植物中，IADF 的发生与轮宽呈非线性增加，而与海拔和年龄呈负相关。最近记录的较高年平均温度几乎在所有研究的物种中都有利于 IADF 的形成。降水在耐旱能力强的物种和双峰生长模式的物种中诱导 IADF 形成方面起着重要作用。我们的研究结果表明，在西欧和南欧生长的具有双峰生长模式的物种将更频繁地形成 IADF，以适应不断升高的温度和干旱。
