Causes and consequences of Cedrela odorata invasion in West African semi-deciduous tropical forests

Van der Meersch Victor, Zo-Bi Irie Casimir, Amani Bienvenu Hippolyte K, Kassi N'dja Justin, N'Guessan Anny Estelle, Herault Bruno. 2021. Causes and consequences of Cedrela odorata invasion in West African semi-deciduous tropical forests. Biological Invasions, 23 : 537-552.

Url - éditeur : https://rdcu.be/cbuOU

Quartile : Q2, Sujet : BIODIVERSITY CONSERVATION / Quartile : Q2, Sujet : ECOLOGY

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie

Résumé : Most of the West African forests have disappeared or have been deeply fragmented. This deforestation dynamic is still ongoing under a strong demographic pressure, forests being mostly replaced by agricultural lands. On the other hand, some reforestation projects are also undertaken, in particular by planting non-native species like Cedrela odorata. To our knowledge, this study is the first to investigate the causes and consequences of Cedrela odorata spread in West African natural forests. We studied a 400ha area of natural forest where 100ha of permanent plots have been affected by a major fire in 1983. Within these permanent plots, 21,444 trees were mapped, botanically determined and their diameters at breast height were measured in 2018. Using a bayesian hierarchical framework, we modelled the causes of the spread of Cedrela odorata in the studied plots, and its consequences on aboveground biomass and tree community diversity. Regarding the causes, the occurrence of Cedrela odorata is significantly linked to the fire occurence 25 years ago, to the proximity of the forest edge and to the presence of hydromorphic soils. Regarding the consequences, Cedrela odorata invasion doesn't have any significant impact on the above-ground biomass but has a strong negative effect on the tree community diversity, as far as decreasing Simpson diversity in Hill numbers from 27 equivalent species in slightly invaded plots to 2 equivalent species in largely invaded plots. Our results highlight the long-lasting impacts of human disturbance (fire, Cedrela odorata introduction) on forest ecosystems and the need to use local species for ongoing reforestation plans in West African semi-deciduous forests.

Mots-clés Agrovoc : Cedrela odorata, espèce envahissante, forêt tropicale, biodiversité forestière, écosystème forestier, déboisement, modélisation environnementale, cartographie des fonctions de la forêt

Mots-clés géographiques Agrovoc : Afrique occidentale

Mots-clés complémentaires : Forêt semi-décidue

Mots-clés libres : Cedrela odorata, Invasive species, West Africa, Tropical semi-deciduous forest, Ecosystem services

Classification Agris : K01 - Foresterie - Considérations générales
F40 - Écologie végétale
F70 - Taxonomie végétale et phytogéographie
K70 - Dégâts causés aux forêts et leur protection

Champ stratégique Cirad : CTS 4 (2019-) - Santé des plantes, des animaux et des écosystèmes

Auteurs et affiliations

• Van der Meersch Victor, AgroParisTech (FRA)
• Zo-Bi Irie Casimir, UFHB (CIV)
• Amani Bienvenu Hippolyte K, CIRAD-ES-UPR Forêts et sociétés (CIV)
• Kassi N'dja Justin, UFHB (CIV)
• N'Guessan Anny Estelle, UFHB (CIV)
• Herault Bruno, CIRAD-ES-UPR Forêts et sociétés (CIV) ORCID: 0000-0002-6950-7286 - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/597078/)

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