利用 14C 测年和树环分析了解巴西坚果树(Bertholletia excelsa)的生长、年轮形成和最大树龄

IF 2 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Radiocarbon Pub Date : 2024-04-29 DOI:10.1017/rdc.2024.39
Victor L Caetano Andrade, Charles R Clement, David Herrera-Ramírez, Thomas Larsen, Flavia Durgante, Nicole Boivin, Jochen Schöngart, Susan Trumbore, Patrick Roberts
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引用次数: 0

摘要

巴西坚果树(Bertholletia excelsa,Lecythidaceae)是南美洲具有重要历史、经济和生态意义的树种。放射性碳测年表明,有些个体的寿命可达数百年到 1000 多年,这意味着它们有可能重建从殖民前到现在的深层生长模式及其与人为管理或气候变化的关系。然而,用不同方法(如树环分析、放射性碳年代测定和重复直径测量)测定的树木年龄估计值差异很大。在此,我们使用两种测年方法(树环计数法和放射性碳测年法)对生长在巴西亚马逊地区四个不同区域的巴西坚果树进行了分析。我们的研究结果表明,这两种方法的吻合程度因地区而异,其中亚马孙河流域特费遗址的吻合程度最高。该地区的考古遗址以人为的 Terra Preta 土壤为特色,并以长期的人类森林管理而闻名。这种管理可能提高了光照和养分的可用性,从而使树木以更高的速度生长并形成年轮。我们的研究结果突出表明,在生态研究中需要更好地了解巴西坚果树的生长过程,同时也需要了解树木年代学在探索亚马逊流域气候变化和人类与森林相互作用方面的潜力。
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Insights into growth, ring formation and maximum ages of Brazil nut trees (Bertholletia excelsa) using 14C dating and tree-ring analysis

The Brazil Nut tree (Bertholletia excelsa, Lecythidaceae) is a species of considerable historical, economic and ecological importance in South America. Radiocarbon dating indicates some individuals can live from hundreds to more than 1000 years, which means they have the potential to reconstruct deep time growth patterns and their relationship to anthropogenic management or climate change from pre-colonial to present times. However, age estimates vary considerably amongst trees dated with different methods (i.e. tree-ring analysis, radiocarbon-dating, and repeated diameter measurements). Here we analyze living Brazil Nut trees growing in four distinct regions across the Brazilian Amazon using two dating methods: tree-ring counting and radiocarbon dating. Our results show that the congruence between the two methods varies amongst regions, and the highest congruence is found at the site of Tefé, Amazonas. This region features archaeological sites with anthropogenic Terra Preta soils, and is known for its long-term human forest management. This management likely enhanced light and nutrient availability, which possibly enabled the trees to grow at higher rates and form annual rings. Our findings highlight the need for better understanding of the growth of Brazil Nut trees for ecological research, but also the potential of dendrochronology for exploring climate change and human-forest interactions in the Amazon Basin.

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来源期刊
Radiocarbon
Radiocarbon 地学-地球化学与地球物理
CiteScore
16.20
自引率
6.00%
发文量
85
审稿时长
6-12 weeks
期刊介绍: Radiocarbon serves as the leading international journal for technical and interpretive articles, date lists, and advancements in 14C and other radioisotopes relevant to archaeological, geophysical, oceanographic, and related dating methods. Established in 1959, it has published numerous seminal works and hosts the triennial International Radiocarbon Conference proceedings. The journal also features occasional special issues. Submissions encompass regular articles such as research reports, technical descriptions, and date lists, along with comments, letters to the editor, book reviews, and laboratory lists.
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