Spatial variation of wood density for Eucalyptus grandis by near infra red hyperspectral imaging combined with X-ray analysis

Chambi Legoas Roger, Tomazello Filho Mario, Gorretta Nathalie, Pasquini Célio, Vidal Cristiane, Roger Jean-Michel, Chaix Gilles. 2019. Spatial variation of wood density for Eucalyptus grandis by near infra red hyperspectral imaging combined with X-ray analysis. Pesquisa Florestal Brasileira, 39, n.spéc., Résumé : pp. 175-176. IUFRO World Congress 2019 "Forest Research and Cooperation for Sustainable Development". 25, Curitiba, Brésil, 29 September 2019/5 October 2019.

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Abstract : Most near-infrared spectroscopy (NIRS) studies for wood density use multiple spectral acquisitions taken manually at several points from pith to bark. Recently the use of near-infrared hyperspectral imaging (NIR- HSI) has shown good performance in predictions of wood properties allowing build high spatial resolution predictive images. The combined use of NIR-HSI and X-ray microdensity imaging (X-ray MDI) could be more practical for evaluation of spatial variation of wood density. The aim was to develop a wood density calibration model for NIR-HSI (625 µm pixel size) from X-ray MDI (30 µm pixel size) and evaluate the spatial variation of wood density along stem cross-section in Eucalyptus grandis trees. Wood discs were collected from 18 trees of 6 years old, submitted to two different water availability, located in Sao Paulo. Brazil. The challenge here was to match the pixels of X-ray MDI to pixels of NIR-HSI (in 2 mm width radial region) to transfer accurate values of wood density to each, pixel of NIR-HSI. The R2 of the model was 0. 72, while the root mean squared error was and 4.8 x 10-2 g cm-3 for the validation group. The prediction model allows comparing their spatial distributions according to the growth conditions. Trees with higher water stress showed higher wood density. Treatments showed a similar spatial variation or wood density. increasing from pith to bark. In perspective, these data will allow evaluating the spatial distribution of wood density inter and intra-tree rings in relation to meteorological variability.

Mots-clés Agrovoc : Eucalyptus grandis, Spectroscopie infrarouge, Spectroscopie aux rayons x, Cerne, Stress dû à la sécheresse, Conditions météorologiques, Modèle de simulation

Mots-clés géographiques Agrovoc : Brésil

Mots-clés complémentaires : Densité du bois

Classification Agris : K10 - Forestry production
K50 - Processing of forest products

Champ stratégique Cirad : CTS 7 (2019-) - Hors champs stratégiques

Auteurs et affiliations

  • Chambi Legoas Roger, CIRAD-BIOS-UMR AGAP (FRA)
  • Tomazello Filho Mario, Universidade de São Paulo (BRA)
  • Gorretta Nathalie, IRSTEA (FRA)
  • Pasquini Célio, UNICAMP (BRA)
  • Vidal Cristiane, UNICAMP (BRA)
  • Roger Jean-Michel, IRSTEA (FRA)
  • Chaix Gilles, CIRAD-BIOS-UMR AGAP (FRA)

Source : Cirad-Agritrop (

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