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Increasing tree size across Amazonia
School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham, United Kingdom; Birmingham Institute of Forest Research (BIFoR), Stafford, United Kingdom; Department of Plant Sciences, University of Cambridge, Cambridge, United Kingdom; School of Geography, University of Leeds, Leeds, United Kingdom.
School of Geography, University of Leeds, Leeds, United Kingdom; School of Biological Sciences, University of Bristol, Bristol, United Kingdom.
School of Geography, University of Leeds, Leeds, United Kingdom.
School of Geography, University of Leeds, Leeds, United Kingdom.
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2025 (English)In: Nature Plants, ISSN 2055-026X, E-ISSN 2055-0278, Vol. 11, p. 2016-2025Article in journal (Refereed) Published
Abstract [en]

Climate change and increasing availability of resources such as carbon dioxide are modifying forest functioning worldwide, but the effects of these changes on forest structure are unclear. As additional resources become available, for example, through CO2 fertilization or nitrogen deposition, large trees, with greater access to light, may be expected to gain further advantages. Conversely, smaller light-suppressed trees might benefit more if their light compensation point changes, while bigger trees may be the most negatively impacted by increasing heat and drought. We assessed recent changes in the structure of Earth’s largest tropical forest by analysing 30 years of Amazonian tree records across 188 mature forest plots. We find that, at a stand level, trees have become larger over time, with mean tree basal area increasing by 3.3% per decade (95% CI 2.4; 4.1). Larger trees have increased in both number and size, yet we observed similar rates of relative size gain in large and small trees. This evidence is consistent with a resource-driven boost for larger trees but also a reduction in suppression among smaller trees. These results, especially the persistence and consistency of tree size increases across Amazonian forest plots, communities and regions, indicate that any negative impacts of climate change on forests and large trees here have so far been mitigated by the positive effects of increased resources.
Place, publisher, year, edition, pages
Springer Nature, 2025. Vol. 11, p. 2016-2025
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Environmental Sciences
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URN: urn:nbn:se:umu:diva-244869DOI: 10.1038/s41477-025-02097-4PubMedID: 40999006Scopus ID: 2-s2.0-105017063319OAI: oai:DiVA.org:umu-244869DiVA, id: diva2:2002873
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EU Sixth Framework Programme for ResearchEU, FP7, Seventh Framework ProgrammeAvailable from: 2025-10-02 Created: 2025-10-02 Last updated: 2025-12-10Bibliographically approved

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Huaraca Huasco, Walter

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