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Impact de la pollution sur les propriétés du bois de palétuviers de mangrove de l’Estuaire du Gabon : cas pratiques de Rhizophora racemosa et d’Avicennia germinans

Abstract : Mangrove mangroves are plants that grow between land and sea in tropical climates. This interface position gives mangroves an important ecological and socio-economic role. Among other things, they serve to protect biodiversity, protect the coasts against erosion of the littoral, and sequester significant quantities of carbon dioxide. In Gabon, however, mangroves face urban pollution. This pollution includes heavy metals (ETM), polycyclic aromatic hydrocarbons (PAHs) and many other wastes depending on their location. Thanks to its developed root system, especially for the species R. racemosa and A. germinans, these mangroves absorb pollutants and concentrate them in the roots and trunk. The objective of this study was to show the impact of pollution on the properties of mangrove wood. The wood from the PAH-polluted site showed undifferentiated sapwood, reduced extractives content and low durability to fungal attack. The wood from the ETM polluted site had a higher natural durability than the wood collected from the unpolluted sites. These results were compared with samples of beech (Fagus sylvatica) impregnated with ETM at the laboratories which showed the same higher durability to fungi.
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File URL :
https://docnum.univ-lorraine.fr/ulprive/DDOC_T_2020_0251_MABICKA_IWANGOU.pdf
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https://hal.univ-lorraine.fr/tel-03428205
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Submitted on : Monday, November 15, 2021 - 9:36:50 AM
Last modification on : Tuesday, November 16, 2021 - 3:21:09 AM

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  • HAL Id : tel-03428205, version 1

Citation

Saint Bickolard Mabicka Iwangou. Impact de la pollution sur les propriétés du bois de palétuviers de mangrove de l’Estuaire du Gabon : cas pratiques de Rhizophora racemosa et d’Avicennia germinans. Biologie végétale. Université de Lorraine; École doctorale des grandes écoles (Libreville, Gabon), 2020. Français. ⟨NNT : 2020LORR0251⟩. ⟨tel-03428205⟩

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