The precise demarcation and cross-dating of tree rings in Aspidosperma tomentosum Mart., a valuable timber species in the tropical dry forests of South America, were used to develop the first well-replicated chronology covering the period 1843–2015. A. tomentosum Mart. tree growth is strongly regulated by soil water availability prior to and during the current growing season. In the context of increased drought severity due to climate change, determining of climate influences on A. tomentosum Mart. radial growth is necessary to establish appropriate guidelines for the management, conservation and restoration of this species, currently affected by extreme weather events, extensive fires and deforestation in the Chiquitania forests, Bolivia. Tropical forest ecosystems play a critical role in the functioning of the Earth; thus, a better understanding of the influences of climate on tree growth is needed to estimate changes in forest productivity and consequently in carbon sink variations at regional and global scales. In the context of global environmental changes, our study aimed at using the growth rings of A. tomentosum Mart. to establish the relationships between radial growth and climatic variations. The anatomical characterization of the wood elements facilitated the precise annual band delimitation and the rejection of samples with false rings and growth anomalies. A tree-ring chronology was developed using traditional dendrochronological methods and the relationships with climate determined using correlation functions. The chronology is based on 20 individuals and covers the period 1843–2015. Tree-ring statistics indicate an important common signal in growth variations between trees (R-bar = 0.31, EPS = 0.90). Interannual variations in A. tomentosum Mart. are directly related to total annual precipitation (r = 0.76) and inversely to mean annual temperature (r = − 0.44). These relationships are similar to those documented for other commercial species (Centrolobium microchaete, Schinopsis brasiliensis) from tropical dry forests in South America, suggesting a consistent climatic influence on tree growth at a regional scale. The strong dependence of tree growth on climate variability is a major concern, as climate change scenarios for tropical dry forests in South America predict an increase in the frequency and intensity of droughts, which in turn would reduce the A. tomentosum Mart. growth during the twenty-first century.

中文翻译：

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Aspidosperma tomentosum Mart 的气候-生长关系。在南美热带干燥森林

Aspidosperma tomentosum Mart. 是南美洲热带干燥森林中的一种有价值的木材品种，其树轮的精确划分和交叉测年被用于制定涵盖 1843 年至 2015 年期间的第一个复制良好的年表。A. tomentosum Mart。在当前生长季节之前和期间，树木的生长受到土壤水分可用性的强烈调节。在气候变化导致干旱严重程度增加的背景下，确定气候对 A. tomentosum Mart 的影响。径向生长对于为该物种的管理、保护和恢复制定适当的指导方针是必要的，该物种目前受到玻利维亚奇基塔尼亚森林的极端天气事件、大面积火灾和森林砍伐的影响。热带森林生态系统在地球运转中发挥着关键作用；因此，需要更好地了解气候对树木生长的影响，以估计森林生产力的变化，从而估计区域和全球范围内碳汇的变化。在全球环境变化的背景下，我们的研究旨在利用 A. tomentosum Mart 的年轮。建立径向生长和气候变化之间的关系。木材元素的解剖学特征有助于精确的年度带定界和拒绝具有假环和生长异常的样品。树轮年表是使用传统的树木年代学方法开发的，并使用相关函数确定与气候的关系。年表基于 20 个人，涵盖 1843 年至 2015 年期间。年轮统计表明树木之间的生长变化是一个重要的共同信号（R-bar = 0.31，EPS = 0.90）。A. tomentosum Mart 的年际变化。与年总降水量直接相关 (r = 0.76)，与年平均气温成反比 (r = − 0.44)。这些关系与来自南美洲热带干燥森林的其他商业物种（Centrolobium microchaete、Schinopsis brasiliensis）所记录的关系相似，表明气候对区域范围内树木生长的影响是一致的。树木生长对气候变率的强烈依赖是一个主要问题，因为南美洲热带干旱森林的气候变化情景预测干旱的频率和强度会增加，这反过来会减少 A. tomentosum Mart。二十一世纪的增长。