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Communication Dans Un Congrès Année : 2008

Wood anatomical variations in a ring porous species and application on a fossil wood study

Anais A Boura
Dario De Franceschi

Résumé

Wood anatomy is an excellent indicator of trees growing environment. Growth rings record the physical and meteorological events and thus constitute a very important information source in various topics, such as, palaeoenvironment researches, dendrochronology and forest management. The interpretation of archaeological and fossil wood has led to an extensive network of chronologies and information about past climates. Although wood structure is very complex and multidimensional, these data are almost entirely derived from a single wood parameter: tree-ring width. In order to get a better comprehension of past climates and probably an accurate vision of them at a sub-annual resolution, we have to take into account other parameters in addition to annual ring width. The sensibility of other wood anatomical characters to geographical distribution has already been shown, but today the intraspecific answer of tree to climate is still nearly unknown. In this study, we explored wood anatomy variations in the temperate species, Castanea sativa, along a geographic gradient from Northern Spain to Northern France. Thanks to Image J, a medical image treatment software, we studied more particularly two groups of wood characters related to productivity (growth ring length) and porosity (vessels density, mean vessel area, maximal vessel area, and total porosity surface. This preliminary study, allowed distinguishing, among other, a few correlations between some wood anatomical variables, and a strong link between wood porosity and minimal winter temperature. Moreover, several profiles among growth rings could be described. In order to explain these groups, we introduced climatic variables as descriptive variable in a principal component analysis. This study constitutes an outline project for the global understanding of ring formation and quantitative wood anatomy character variations, as well as their climatic determinism. It thus brings knowledge about potential varying characters, and methods which could potentially be applied on fossil wood deposit so as to better decipher the huge records that fossil wood constitute. We applied the same methodology to samples of Castanoxylon bavaricum, from the upper Miocene of Cantal (South of France) in order to test this last point.
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Dates et versions

hal-03665590 , version 1 (11-05-2022)

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  • HAL Id : hal-03665590 , version 1

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Anais A Boura, Dario De Franceschi. Wood anatomical variations in a ring porous species and application on a fossil wood study. 8th International Organisation of Palaeobotany Conference IOPC, Sep 2008, Bonn, Germany. ⟨hal-03665590⟩
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