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Updated: Aug 7, 2025
09:33
A Technical Perspective in Modern Tree-ring Research - How to Overcome Dendroecological and Wood Anatomical Challenges
Published on: March 5, 2015
29.2K
Radiocarbon and wood anatomy as complementary tools for generating tree-ring records in Bolivia
Arturo Pacheco-Solana1, Rose Oelkers1, Rosanne D'Arrigo1
1Tree Ring Laboratory at LDEO, Columbia University, New York City, NY, United States.
Frontiers in Plant Science
|March 13, 2023
Summary
This study establishes accurate tree-ring dating for Neltuma alba in the tropical Andes. Combining wood anatomy and radiocarbon analysis, it overcomes challenges in dating tropical species for climate research.
Area of Science:
- Tropical Dendrochronology
- Paleoclimatology
- Wood Anatomy
Background:
- Dendrochronology is expanding into tropical regions previously considered unsuitable for tree-ring dating.
- Accurate tree-ring chronologies are crucial for reconstructing past climate and ecological conditions.
- Neltuma alba (algarrobo blanco) is a new species for dendrochronological studies in the Bolivian Andes.
Purpose of the Study:
- To develop the first verified annual tree-ring chronology for Neltuma alba.
- To validate annual periodicity using radiocarbon (14C) analysis and wood microsectioning.
- To assess the potential of Neltuma alba for paleoclimatic and ecological studies in South America.
Main Methods:
- Generated a preliminary chronology using traditional cross-dating techniques on six Neltuma alba trees.
- Measured 14C content in tree rings and compared with Southern Hemisphere (SH) atmospheric 14C curves.
- Analyzed wood anatomical microsections to identify challenging tree-ring boundaries and verify annual rings.
Main Results:
- Radiocarbon analysis revealed discrepancies (5 and 12-year offsets) in the initial chronology, indicating missing rings.
- Wood microsections identified narrow terminal parenchyma, defining previously unseen annual rings within the sapwood.
- Corrected chronology showed perfect agreement between dendrochronological calendar years and 14C dating.
- Confirmed a strong legacy effect of prior climate conditions on Neltuma alba growth.
Conclusions:
- Wood anatomical methods and 14C analysis effectively complement traditional dendrochronology for species with difficult-to-discern tree rings.
- Neltuma alba can be accurately dated, providing a valuable new proxy for reconstructing past climate and ecological dynamics in tropical and subtropical South America.
- This study demonstrates the potential for expanding dendrochronology into new tropical regions and species.
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