Using multispecies NIRS calibration for predicting chemical properties of eucalypts wood

Razafimahatratra Andriambelo Radonirina, Ramananantoandro Tahiana, Nourissier Sophie, Mevanarivo Zo Elia, Tomazello Filho Mario, Makouanzi Garel, Clément-Vidal Anne, Rodrigues José, Chaix Gilles. 2018. Using multispecies NIRS calibration for predicting chemical properties of eucalypts wood. In : Eucalyptus 2018: Managing Eucalyptus plantation under global changes. Abstracts book. CIRAD, IUFRO, MUSE. Montpellier : CIRAD, Résumé, p. 32. ISBN 978-2-87614-743-0 Eucalyptus 2018, Montpellier, France, 17 September 2018/21 September 2018.

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Abstract : Breeding programs in Africa are generally based on growth criteria and rarely on wood chemical properties. Indeed, chemical analysis are often expensive, time-consuming and require several replicates. Then, using NIRS to predict these properties is a relevant solution. The research question focuses on the possibility of using multispecies models to predict properties of different species. This study considers 7 chemical properties (extractives, Klason lignin, acidosoluble lignin ASL, SG ratio, holocellulose, alphacellulose, hemicelluloses) based on 367 samples from 4 countries, belonging to 5 eucalypt species with hybrids (E. robusta, camaldulensis, urophylla, uropellita, urograndis). Established models were validated by cross- and test-set validation. Results shows that all R2CV are greater than 0.73, and all %RMSECV are less than 8.3% except for extractives and ASL. Prediction errors (%RMSEP) are always less than 9.5% except for these 2 properties, with respectively 23.6% and 18.1%. Prediction errors are always less than the double of the error of laboratory (%SEL). This study shows that multispecies NIRS models can be used to predict chemical properties, there is no significant difference between measurement error obtained with standardized method and %RMSEP. This method is particularly well-suited for a rapid wood phenotyping of multiple samples belonging to different species.

Mots-clés libres : Eucalyptus, Sustainability, Ecosystem services, Abiotic stresses, Biotic stresses, Plantation project

Auteurs et affiliations

  • Razafimahatratra Andriambelo Radonirina, ESSA (MDG)
  • Ramananantoandro Tahiana, ESSA (MDG)
  • Nourissier Sophie, CIRAD-BIOS-UMR AGAP (FRA)
  • Mevanarivo Zo Elia, ESSA (MDG)
  • Tomazello Filho Mario, ESALQ (BRA)
  • Makouanzi Garel, Université Marien Ngouabi (COG)
  • Clément-Vidal Anne, CIRAD-BIOS-UMR AGAP (FRA)
  • Rodrigues José, ISA [Instituto Superior de Agronomia] (PRT)
  • Chaix Gilles, CIRAD-BIOS-UMR AGAP (FRA) ORCID: 0000-0003-2015-0551

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