Density, extractives and decay resistance variabilities within branch wood from four agroforestry hardwood species

Terrasse Florence, Brancheriau Loïc, Marchal Rémy, Boutahar Nabila, Lotte Sylvain, Guibal Daniel, Pignolet Luc, Candelier Kévin. 2021. Density, extractives and decay resistance variabilities within branch wood from four agroforestry hardwood species. Iforest, 14 (3) : 212-220.

Quartile : Q3, Sujet : FORESTRY

Résumé : Agroforestry practices like pruning trees to control the light flux to crops produce every year a large volume of branches which is valorized by farmers as mulching or energy fuel. However, according to the literature, the wood of branches shows higher rates of polyphenols than stem wood and this can open some new perspectives for branch exploitation. In this study, the wood properties (density, mechanical properties, extractive content and decay resistance) were determined on branches of different sizes from oak, chestnut, poplar and walnut trees collected in two agroforestry systems. These properties were evaluated according to the wood age and the sampling position along the radial and longitudinal axes of the branch. All samples were analyzed by NIR-Spectroscopy and a predicting model aimed to assess the branch wood properties has been developed. Wood characteristics largely vary between species and do not exactly follow the same trends from one species to another. Overall, hardwood density of branches is similar to that of trunks, the content in wood extractives follows similar evolutions, and the decay resistance of branch wood does not seem to be really impacted by its position along the branch. Reliable NIRS models were built to easily predict the wood density and extractives content of agroforestry branches. The extractives content and the decay resistance of branch hardwood appear to be substantially lower than those of trunks, which suggests a non-suitability of branch wood for developing high-valued green chemistry.

Mots-clés Agrovoc : agroforesterie, propriété du bois, densité du bois, branche, carie du bois, Quercus robur, Castanea sativa, Juglans nigra, Juglans regia, Populus, déchet d'exploitation forestière, spectroscopie infrarouge, résistance aux maladies

Mots-clés géographiques Agrovoc : France

Mots-clés complémentaires : populus generosa

Mots-clés libres : Agroforestry, Branches, NIR-Spectrometry, Wood Quality

Classification Agris : K50 - Technologie des produits forestiers
K01 - Foresterie - Considérations générales

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

Auteurs et affiliations

• Terrasse Florence, Université de Montpellier (FRA)
• Brancheriau Loïc, CIRAD-PERSYST-UPR BioWooEB (FRA) ORCID: 0000-0002-9580-7696
• Marchal Rémy, CIRAD-PERSYST-UPR BioWooEB (FRA)
• Boutahar Nabila, CIRAD-PERSYST-UPR BioWooEB (FRA)
• Lotte Sylvain, CIRAD-PERSYST-UPR BioWooEB (FRA)
• Guibal Daniel, CIRAD-PERSYST-UPR BioWooEB (FRA)
• Pignolet Luc, CIRAD-PERSYST-UPR BioWooEB (FRA)
• Candelier Kévin, CIRAD-PERSYST-UPR BioWooEB (FRA) ORCID: 0000-0002-9328-8511 - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/598189/)

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