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Matching Dendrochronological Dates with the Southern Hemisphere 14C Bomb Curve to Confirm Annual Tree Rings in Pseudolmedia rigida from Bolivia

Published online by Cambridge University Press:  09 February 2016

Laia Andreu-Hayles
Affiliation:
Tree-Ring Laboratory, Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, USA Institut Català de Ciències del Clima (IC3), Barcelona, Catalonia, Spain
Guaciara M Santos*
Affiliation:
Department of Earth System Science, University of California, Irvine, CA, USA
David A Herrera-Ramírez
Affiliation:
Universidad Nacional de Colombia Sede Medellín, Colombia
Javier Martin-Fernández
Affiliation:
Tree-Ring Laboratory, Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, USA
Daniel Ruiz-Carrascal
Affiliation:
Escuela de Ingenieria de Antioquia, Colombia International Research Institute for Climate and Society, Columbia University, Palisades, NY, USA
Tatiana E Boza-Espinoza
Affiliation:
Universidad Nacional de San Antonio Abad del Cusco, Cusco, Perú
Alfredo F Fuentes
Affiliation:
Herbario Nacional de Bolivia, La Paz, Boliva Missouri Botanical Garden, St. Louis, MO, USA
Peter M J⊘rgensen
Affiliation:
Missouri Botanical Garden, St. Louis, MO, USA
*
Corresponding author. Email: gdossant@uci.edu.

Abstract

This study used high-precision radiocarbon bomb-pulse dating of selected wood rings to provide an independent validation of the tree growth periodicity of Pseudolmedia rigida (Klotzsch & H. Karst) Cuatrec. from the Moraceae family, collected in the Madidi National Park in Bolivia. 14C content was measured by accelerator mass spectrometry (AMS) in 10 samples from a single tree covering over 70 yr from 1939 to 2011. These preliminary calendar dates were determined by dendrochronological techniques and were also used to select the samples for 14C AMS. In order to validate these preliminary dates using the established Southern Hemisphere (SH) 14C atmospheric concentration data set, the targeted rings were selected to be formed during periods before and after the 14C bomb spike nuclear tests (i.e. 1950s–1960s). The excellent agreement of the dendrochronological dates and the 14C signatures in tree rings associated with the same dates provided by the bomb-pulse 14C atmospheric values for the SH (SHCal zone 1–2) confirms the annual periodicity of the observed growth layers, and thus the high potential of this species for tree-ring analysis. The lack of discrepancies between both data sets also suggests that there are no significant latitudinal differences between the 14C SHCal zone 1–2 curve and the 14C values obtained from the selected tree rings at this geographic location (14°33′S, 68°49′W) in South America. The annual resolution of P. rigida tree rings opens the possibility of broader applications of dendrochronological analysis for ecological and paleoclimatic studies in the Bolivian tropics, as well as the possibility of using wood samples from some tree species from this region to improve the quality of the bomb-pulse 14C SHCal curve at this latitude.

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Copyright
Copyright © 2015 by the Arizona Board of Regents on behalf of the University of Arizona 

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