In search of the forest in Côte d'Ivoire, parts 1 & 2
2015
Aubréville, André
Until 1935, tracts of virgin forest could still be seen when travelling along the roads of Côte d'Ivoire. Since then, with the un¬bridled expansion of coffee and rain-fed rice crops, runaway forest clearing has been the rule. Farmers fleeing the depre¬dations of the agouti, or of parasitic fam¬ily members, move away to clear more distant forests. By 1957, an expedition was needed to search for primary forests. A new road would destroy a forest within ten years, and loggers would only come through once. With the disappearance of Africa's dense humid forests, the dry sea¬son in its Sudano-Sahelian regions has grown longer. It is also important to map the areas of primary forest before they disappear altogether. The study presented here aimed to classify the vegetation of Côte d'Ivoire's forests on the basis of 12 transects in dense humid forests, since the phytosociological approach is not robust enough to produce such an analysis. Two groups characterised by specific botani¬cal families were identified: “dense humid semi-deciduous forests with Malvaceae and Ulmaceae”, and “dense humid forests with evergreen leguminous species”. How¬ever, some species with high dispersal po-tential, which are abundant in secondary forests, especially Triplochiton and Termi¬nalia, do not fit into this classification. The fact that the areas of distribution of cer¬tain species are discontinuous may be ac¬counted for by seed dispersal, but also by the palaeohistory of the flora and climate. Similarly, the ecological area concept can¬not be applied to rare or locally endemic species. This study also discusses sev¬eral indigenous invasive species, such as Scaphopetalum amoemum and Chidlowia sanguinea, whose growth prevents forest regeneration. Finally, it discusses the pres¬ence within humid forests of patches of sa¬vannah, which are always of edaphic and not anthropic origin. Abstract adapted by the editorial team. (Résumé d'auteur)
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