碳-14炸弹峰值作为热带地区树木年代学的转折点：文献综述和对针叶Araucaria angustifolia的研究

IF 2.7 3区农林科学 Q1 FORESTRY

Dendrochronologia Pub Date : 2025-02-28 DOI:10.1016/j.dendro.2025.126310

Cláudia Fontana , Milena Godoy-Veiga , Lidio López , Luiz Carlos Pessenda , Bruna Hornink , Gabriel Assis-Pereira , Marcelo Callegari Scipioni , Francisco William da Cruz , Mario Tomazello-Filho , Ricardo Villalba

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引用次数: 0

摘要

在热带地区建立可靠的树木年轮年表仍然是一个挑战，然而，可以通过结合直接和间接方法来减轻这一挑战。本研究探讨了经典树木年代学和放射性碳（¹⁴C）测年之间的协同作用。为此，我们制定了巴西南部阿劳卡亚（Araucaria angustifolia）的初步年代学，并汇编了¹⁴C在巴西树木年代学中的应用。我们使用经典的树木年代学方法对三棵树的样本进行了树木生长的同步性测试。对选定的树木年轮，特别是在碳弹峰值期间形成的年轮进行放射性碳分析，证实了年轮的年轮性质，并验证了我们的经典定年方法的准确性。虽然观察到最初的年代差异，但通过考虑该物种形成层活动开始的可变性，这些差异得到了解决。分析调整前（r = 0.366）和调整后（r = 0.423）树木生长变异（样本数n = 3,1930 ~ 2018年）的同向性后，平均序列相关增加。我们的研究结果表明，结合经典的树木年代学和碳定年来建立可靠的年代学是有效的，特别是对于热带和亚热带物种，如A. angustifolia，这些物种的年代学存在挑战。这一初步年表为建立一个更全面、更容易复制的巴西热带刺叶年表提供了有力的参考。此外，文献综述表明，巴西的放射性碳测年研究虽然仍然相对较少（21项研究）且地理分布不均匀，但在过去5年中取得了显著进展。我们的案例研究强调了¹⁴C分析在巴西树木年轮研究中日益增长的重要性，并强调需要进一步研究以完善南半球的¹⁴C校准曲线。

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The carbon-14 bomb peak as a turning point in dendrochronology in tropics: A literature review and case study with Araucaria angustifolia

Establishing reliable tree-ring chronologies in the tropics remains a challenge, however, it can be mitigated by combining direct and indirect methods. This study investigates the synergy between classical dendrochronology and radiocarbon (¹⁴C) dating. For this purpose, we developed a preliminary chronology for Araucaria angustifolia in southern Brazil and a compilation of ¹⁴C applications in Brazilian dendrochronology. We tested the synchronicity of tree growth using classical dendrochronological methods on samples from three trees. Radiocarbon analysis of selected tree rings, specifically those formed during the ¹⁴C bomb peak, confirmed the annual nature of growth rings and validated the accuracy of our classical dating. While initial dating discrepancies were observed, these were resolved by considering the variability in the onset of cambial activity for this species. The mean series intercorrelation increased after analyzing the synchronicity in tree growth variability (number of samples n = 3, period 1930–2018) before (r = 0.366) and after (r = 0.423) the adjustments. Our findings demonstrate the effectiveness of combining classical dendrochronology and ¹⁴C dating to establish robust chronologies, particularly for tropical and subtropical species such as A. angustifolia that present dating challenges. This preliminary chronology provides a robust reference for developing a more comprehensive and well-replicated A. angustifolia chronology for subtropical Brazil. Additionally, the literature review showed that radiocarbon dating studies in Brazil, while still relatively scarce (21 studies) and with an uneven geographic distribution, have significantly advanced over the past 5 years. Our case study highlights the growing importance of ¹⁴C analysis in tree-ring research in Brazil and emphasizes the need for further studies to refine ¹⁴C calibration curves for the Southern Hemisphere.

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来源期刊

Dendrochronologia FORESTRY-GEOGRAPHY, PHYSICAL

CiteScore

5.50

自引率

13.30%

发文量

审稿时长

22.8 weeks

期刊介绍： Dendrochronologia is a peer-reviewed international scholarly journal that presents high-quality research related to growth rings of woody plants, i.e., trees and shrubs, and the application of tree-ring studies. The areas covered by the journal include, but are not limited to: Archaeology Botany Climatology Ecology Forestry Geology Hydrology Original research articles, reviews, communications, technical notes and personal notes are considered for publication.