2 research outputs found
Diversite floristique et valeur de conservation de la foret classee de Badenou (Korhogo, Cote dâIvoire)
La prĂ©sente Ă©tude a Ă©tĂ© initiĂ©e pour contribuer Ă la gestion durable de la forĂȘt classĂ©e de BadĂ©nou. Elle a permis dâanalyser les diversitĂ©s floristiques, la structure de la vĂ©gĂ©tation et dâestimer le stock de carbone sĂ©questrĂ© dans les diffĂ©rents biotopes le long dâune chronosĂ©quence de stades postculturaux au sein dâun systĂšme de forĂȘt claire de CĂŽte dâIvoire. Un total de 241 espĂšces a Ă©tĂ© recensĂ© dans lâensemble du massif, dont 97 espĂšces (inventoriĂ©es dans les 30 parcelles) participent Ă la chronosĂ©quence. Les 241 espĂšces Ă©taient rĂ©parties en 184 genres et 53 familles, dont les plus importantes Ă©taient les Fabaceae, les Rubiaceae et les Poaceae. La flore de cette aire protĂ©gĂ©e est aussi caractĂ©risĂ©e par la prĂ©sence des espĂšces Ă statut particulier dont une endĂ©mique ivoirienne. Ces travaux montrent Ă©galement que les paramĂštres de composition et de structures des peuplements augmentent avec lâĂąge de la jachĂšre. Le potentiel de stockage de carbone des diffĂ©rents biotopes rend compte de la participation de la forĂȘt classĂ©e de Badenou Ă la rĂ©duction du CO2 atmosphĂ©rique dans cette rĂ©gion de la CĂŽte dâIvoire. Malheureuse, la forĂȘt classĂ©e de Badenou subit encore dâĂ©normes pressions anthropiques. Les efforts de conservation des espĂšces endĂ©miques, rares et menacĂ©es dâextinction et de la forĂȘt classĂ©e elle-mĂȘme doivent ĂȘtre une prioritĂ©.
Mots-clĂ©s : ForĂȘt claire, JachĂšres, BiodiversitĂ©, Changement climatique, Badenou
English Title: Floristic diversity and conservation value of the Badenou Classified Forest (Korhogo, Cote dIivoire)
This study was initiated to contribute to the sustainable management of the Badénou classified forest. It allowed to analyze the floristic diversities, the structure of the vegetation and estimate the carbon stock sequestered in the various biotopes along a chronosequence of post-cultural stages within a system of clear forest of Ivory Coast. A total of 241 species have been identified throughout the massif, of which 97 species (inventoried in the 30 plots) participate in the chronosequence. The 241 species were divided into 184 genus and 53 families, the most important of its were Fabaceae, Rubiaceae and Poaceae. The flora of this protected area is also characterized by the presence of special status species including an endemic Ivorian. This study also show that the parameters of stand composition and structure increase with the age of the fallow. The carbon storage potential of the different biotopes accounts for the participation of the Badénou classified forest in the reduction of atmospheric CO2 in this region of Ivory Coast. Unfortunately, the Badénou classified forest is still under enormous human pressure. Conservation efforts for endemic species, rare and endangered species and the classified forest itself must be a priority.
Keys words: Clear forest, Fallows, Biodiversity, Climate change, Badeno
Co-limitation towards lower latitudes shapes global forest diversity gradients
The latitudinal diversity gradient (LDG) is one of the most recognized global patterns of species richness exhibited across a wide range of taxa. Numerous hypotheses have been proposed in the past two centuries to explain LDG, but rigorous tests of the drivers of LDGs have been limited by a lack of high-quality global species richness data. Here we produce a high-resolution (0.025°âĂâ0.025°) map of local tree species richness using a global forest inventory database with individual tree information and local biophysical characteristics from ~1.3 million sample plots. We then quantify drivers of local tree species richness patterns across latitudes. Generally, annual mean temperature was a dominant predictor of tree species richness, which is most consistent with the metabolic theory of biodiversity (MTB). However, MTB underestimated LDG in the tropics, where high species richness was also moderated by topographic, soil and anthropogenic factors operating at local scales. Given that local landscape variables operate synergistically with bioclimatic factors in shaping the global LDG pattern, we suggest that MTB be extended to account for co-limitation by subordinate drivers