Publications Scientifiques

[ Article ] Wound reaction after bark harvesting: microscopic and macroscopic phenomena in ten medicinal tree species (Benin)

Date de soumission: 15-04-2017
Année de Publication: 2010
Entité/Laboratoire Laboratoire d'Ecologie Appliquée (LEA)
Document type : Article
Discipline(s) : Sciences Environnement &Ecologie
Titre Wound reaction after bark harvesting: microscopic and macroscopic phenomena in ten medicinal tree species (Benin)
Auteurs DELVAUX Claire [1], SINSIN Brice [2], Van Damme Patrick [3], BEECKMAN Hans [4],
Journal: Trees
Catégorie Journal: Internationale
Impact factor: 0
Volume Journal: 24
Resume In Africa, little is known about how the vascular anatomy of medicinal tree species is influenced by bark harvesting, and the ability of species to react against debarking needs to be better understood. This study aims to evaluate the temporal and spatial impact of bark harvesting on wood anatomy and to determine the extent to which a tree’s ability to close the wound after bark harvesting is affected by anatomical changes in the wood. We harvested bark from ten medicinal tree species located in an Isoberlinia doka woodland in Central Benin. Two years after debarking, the wound closure was measured and one tree per species was cut at the wound level to collect a stem disc. On the cross section of each disc, vessel features (area, density and specific conductive area) were measured in the radial direction (before and after wounding) and on three locations around the disc surface. We found that during early wound healing, all species produced vessels with a smaller area than in unaffected wood and this significantly decreased the specific conductive area in eight of the investigated species. However, after 2 years, only six trees had restored their specific conductive area. In addition, a significant positive correlation (r = 0.64, P\0.005) confirmed the relationship between the specific conductive area and tissue production to close the wound and delineated the study group into two groups of trees. Therefore, we concluded that vessels appeared to be very good anatomical indicators of the tree’s reactions to debarking.
Mots clés Bark harvesting, Specific conductive area, Re-growth dynamics, Vessel features, Wood anatomy
Pages 941 - 951

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