NIR‑hyperspectral camera analyses for differencing agroforestry and forestry poplar woods

Heim Lucie, Brancheriau Loïc, Marchal Rémy, Boutahar Nabila, Denaud Louis, Badel Eric, Meghar Karima, Candelier Kévin. 2023. NIR‑hyperspectral camera analyses for differencing agroforestry and forestry poplar woods. Agroforestry Systems, 97 : 1557-1569.

Résumé : Wood characteristics of trees grown in agroforestry systems are still little studied, while their growth conditions are different from conventional stands. This work focused on the impact of the agroforestry system on the lignin/cellulose ratio of hybrid poplar trees. One disk sample was harvested on 6 agroforestry (AF) and 6 forest control (FC) poplar trees, at breast height ground level (1.30 m). Every disk was analyzed by Near Infrared Hyperspectral imaging using a Specim FX17 (Specim, Spectral Imaging Ltd.). Images from hyperspectral camera analyses corresponding to absorbance spectra were collected at the wavelength of 1450 nm, attributed to first overtone O–H stretching vibration of lignin/extractives compounds, in order to clearly observe the chemical difference between AF and FC poplar woods. The results indicated significant difference between the chemical composition, based on estimated lignin content, of AF and FC poplar woods. According to the results from NIR-hyperspectral images analyses, the lignin content appeared to be lower in AF poplar wood (9.8 ± 1.1 pixels/mm2) than in FC poplar wood (16.1 ± 3.8 pixels/mm2). These results could be explained by the different tree growing conditions between the both systems. AF poplar tended to produce more tension wood and more juvenile wood than FC poplar, which resulted in a lower concentration in lignin.

Mots-clés Agrovoc : agroforesterie, analyse spectrale, Populus, modèle de croissance forestière

Mots-clés libres : Cellulose, Flexure wood, Growing conditions, Lignin, Populus deltoïde × Populus nigra, Koster, NIR-hyperspectral imaging

Classification Agris : F08 - Systèmes et modes de culture
F40 - Écologie végétale
U30 - Méthodes de recherche

Champ stratégique Cirad : CTS 2 (2019-) - Transitions agroécologiques

Auteurs et affiliations

• Heim Lucie, CIRAD-PERSYST-UPR BioWooEB (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)
• Denaud Louis, Arts et Metiers Institute of Technology (FRA)
• Badel Eric, INRAE (FRA)
• Meghar Karima, CIRAD-PERSYST-UMR Qualisud (FRA)
• Candelier Kévin, CIRAD-PERSYST-UPR BioWooEB (FRA) ORCID: 0000-0002-9328-8511 - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/605739/)

Métriques

[ Page générée et mise en cache le 2024-01-29 ]