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Exploring the 14C Bomb Peak with Tree Rings of Tropical Species from the Amazon Forest

Published online by Cambridge University Press:  28 April 2017

R Linares ,
H C Santos ,
A F N Brandes ,
C F Barros ,
C S Lisi ,
F C Balieiro  and
S M de Faria
R Linares*
Affiliation:
Instituto de Física, Universidade Federal Fluminense, 24210-340, Niterói, RJ, Brazil
H C Santos
Affiliation:
INFN, Laboratori Nazionali del Sud, Via S. Sofia, 62, 95123, Catania, Italy
A F N Brandes
Affiliation:
Instituto de Biologia, Universidade Federal Fluminense, 24020-141, Niterói, RJ, Brazil
C F Barros
Affiliation:
Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, 22460-030, Rio de Janeiro, RJ, Brazil
C S Lisi
Affiliation:
Centro de Ciências Biológicas e da Saúde, Universidade Federal de Sergipe, 49100-000, São Cristovão, SE, Brazil
F C Balieiro
Affiliation:
Centro Nacional de Pesquisa de Agrobiologia, Empresa Brasileira de Pesquisa Agropecuária, 23890-000, Seropédica, RJ, Brazil
S M de Faria
Affiliation:
Centro Nacional de Pesquisa de Agrobiologia, Empresa Brasileira de Pesquisa Agropecuária, 23890-000, Seropédica, RJ, Brazil
*
*Corresponding author. Email: [email protected].
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Abstract

In this work we explore the radiocarbon (14C) signal as an independent tool to assess the year of formation of individual tree rings of tropical species in northern Brazil. Three different species were analyzed in this work: Dipteryx magnifica, Enterolobium maximum, and Hymenolobium petraeum. The studied samples are from the stem of only one individual of each species, all cut down in 2008 in Porto Trombetas, Pará, Brazil. Individual tree rings were identified based on wood anatomy and they were counted from bark to pith. Several rings were selected for 14C analysis in order to cover the overall shape of the 14C atmospheric bomb peak (after 1955). The 14C content was measured at Laboratory of Radiocarbon, Universidade Federal Fluminense (LAC-UFF). Results are compared with the Southern Hemisphere 14C atmospheric calibration curves. For E. maximum and H. petraeum the 14C signal exhibits an overall good match with the SH zone 3 and suggests annual seasonality in the growth-ring formation. These species offer suitable characteristics for dendrochronology. The D. magnifica shows mismatches in the 14C measurements that are likely a result of difficulties in identifying ring boundaries with certainty. Additional techniques may be helpful to disentangle the origin of this discrepancy.

Keywords

radiocarbondendrochronologytropical species
Type
Rapid Event in the Natural Atmospheric 14C Content
Information
Radiocarbon , Volume 59 , Special Issue 2: Proceedings of the 22nd International Radiocarbon Conference (Part 1 of 2) , April 2017 , pp. 303 - 313
Copyright
© 2017 by the Arizona Board of Regents on behalf of the University of Arizona 

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Footnotes

Selected Papers from the 2015 Radiocarbon Conference, Dakar, Senegal, 16–20 November 2015

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