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Propriétés radiatives des couronnes de Noyers (Juglans nigra x J. regia) et croissance des pousses annuelles - Influence de la géométrie du feuillage, de la position des pousses et de leur climat radiatif

Abstract : Modelling tree architectural development according to environmental factors is an emerging field of
research thanks to the development of adequate computational methods. However, modelling virtual
plants is greatly constrained by the difficulty in collecting the architectural and geometric data of woody
architecture and foliage. Moreover, partial understanding of functional processes that drive shoot growth
limits the analysis and the modelling of the processes involved. Cross-fertilization of insights into
architectural and morphological variability of Walnut tree on the one hand, and into growth physiology on
the other hand, enables to better understand crown development. Thanks to 3-dimensional measurements
of topology and geometry made on 7 to 9 years-old Walnut trees, we have analysed the impact on light
interception of variables required for virtual plant modelling that are tedious to measure and that render
extrapolation methods necessary. Secondly, we quantified the part of variance of growth variables which
can be explained by radiation intercepted by comparison with other factors such as topological position.
Our results point out the limitations of using allometric relationships and statistical laws for the
reconstruction of 3D canopies. Leaf clumping inside the crown, including the clumping of leaflets at leaf
scale, strongly determines the radiative properties of reconstructed crowns. Thanks to an approach based
on correlations and statistics, an effect of light intercepted by mother shoots on the growth of daughter
shoots was established. Strong correlations between shoot vigour (quantified by an index) and the length
of the pathway between the collar and shoots on the one hand and shoot growth on the other hand
suggest an effect of hydraulic architecture.
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https://tel.archives-ouvertes.fr/tel-00087909
Contributor : Yannick Brohard <>
Submitted on : Thursday, July 27, 2006 - 4:57:31 PM
Last modification on : Thursday, July 2, 2020 - 2:01:13 PM
Long-term archiving on: : Monday, April 5, 2010 - 10:18:21 PM

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  • HAL Id : tel-00087909, version 1
  • PRODINRA : 252404

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Citation

Claude-Eric Parveaud. Propriétés radiatives des couronnes de Noyers (Juglans nigra x J. regia) et croissance des pousses annuelles - Influence de la géométrie du feuillage, de la position des pousses et de leur climat radiatif. Ecologie, Environnement. Université Montpellier II - Sciences et Techniques du Languedoc, 2006. Français. ⟨tel-00087909⟩

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