Fire history of a giant African baobab evinced by radiocarbon dating

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2010-08Author
Patrut, Adrian
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Mayne, Diana H.
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von Reden, Karl F.
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Lowy, Daniel A.
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Van Pelt, Robert
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McNichol, Ann P.
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Roberts, Mark L.
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Margineanu, Dragos
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https://hdl.handle.net/1912/4374Abstract
The article reports the first radiocarbon dating of a live African baobab (Adansonia digitata L.), by investigating
wood samples collected from 2 inner cavities of the very large 2-stemmed Platland tree of South Africa. Some 16 segments
extracted from determined positions of the samples, which correspond to a depth of up to 15–20 cm in the wood, were
processed and analyzed by accelerator mass spectrometry (AMS). Calibrated ages of segments are not correlated with their
positions in the stems of the tree. Dating results indicate that the segments originate from new growth layers, with a thickness
of several centimeters, which cover the original old wood. Four new growth layers were dated before the reference year AD
1950 and 2 layers were dated post-AD 1950, in the post-bomb period. Formation of these layers was triggered by major damage
inside the cavities. Fire episodes are the only possible explanation for such successive major wounds over large areas or
over the entire area of the inner cavities of the Platland tree, able to trigger regrowth.
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Author Posting. © Arizona Board of Regents on behalf of the University of Arizona, 2010. This article is posted here by permission of Dept. of Geosciences, University of Arizona for personal use, not for redistribution. The definitive version was published in Radiocarbon 52 (2010): 717-726.
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