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Please use this identifier to cite or link to this item: http://apo.ansto.gov.au/dspace/handle/10238/3815

Title: Validating putatively cross-dated Callitris tree-ring chronologies using bomb-pulse radiocarbon analysis
Authors: Pearson, S
Hua, Q
Allen, K
Bowman, DMJS
Keywords: Tree Rings
Carbon 14
Carbon Isotopes
New South Wales
Western Australia
Age Estimation
Issue Date: 10-Feb-2011
Publisher: CSIRO PUBLISHING
Citation: Pearson, S., Hua, Q.A., Allen, K., Bowman, D.M.J.S. (2011). Validating putatively cross-dated Callitris tree-ring chronologies using bomb-pulse radiocarbon analysis, AUSTRALIAN JOURNAL OF BOTANY, 59(1); 7-17
Abstract: Nuclear weapons testing during the 1950s generated an atmospheric pulse of the carbon isotope, (14)C. Worldwide, trees growing during that period and in subsequent decades assimilated (14)C-enriched CO(2), leaving a distinct isotopic signature that can be used to precisely date tree rings. Thirty single-ring samples were extracted for AMS (14)C analysis from cores taken from living trees of five different Callitris species [C. endlicheri (Parl.) F. M. Bailey, C. glaucophylla Joy Thomps. & L.A.S. Johnson, C. intratropica Benth., C. preissii Miq., and C. rhomboidea R.Br. ex Rich. & A. Rich] at 13 sites. The ages of individual tree rings were determined by both (14)C bomb-pulse dating and cross-dating (based on 20-30 cores from the same site) in order to (1) provide independent verification of tree-ring dates, (2) detect false or missing rings from sites with otherwise good chronologies, and (3) test whether growth rings were annual for cores from sites where cross-dating was not possible. Our approach confirmed dates on chronologies from monsoon tropical sites, provided checked chronologies in subtropical and temperate sites, and improved dating control on arid-zone ring counts. It was found that Callitris are more likely to form regular annual rings when growing in seasonally dry environments than in more arid sites with highly variable precipitation patterns. © 2011, CSIRO Publishing
URI: http://dx.doi.org/10.1071/BT10164
http://apo.ansto.gov.au/dspace/handle/10238/3815
ISSN: 0067-1924
Appears in Collections:Journal Articles

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