This study was carried out at Ibi on the Batéké Plateau in the Democratic Republic of Congo, with the aim of investigating the vegetation dynamics of a savannah subjected to anthropogenic action and burnt every year (protected savannah), in contrast to a savannah put out to pasture, both separated by a transition zone (ecotone or edge) which has not been regularly burnt like the first. To study vegetation dynamics, 30 floristic inventory plots were set up, with 10 plots per savanna type. The sampling plan for our data collection was designed in two periods, in April 2022 during the rainy season and in July of the same year during the dry season. A total of 144 plant species, divided into 23 genera and 40 families, were inventoried. Of the three experimental zones, the edge had the highest biodiversity, with 73 species (50.3%). The protected savannah totaled 36 species, representing 24.8%, compared with 35 species (24.1%) in the protected savannah. It should be noted that the control savannah is dominated by herbaceous plants (Poaceae), since it burns every year. On the other hand, the protected savannah and the fringe, separated from the control savannah by the fact that they have been protected from bush fires, have evolved differently. In both areas, shrub and tree strata dominate, with the presence of gallery forest species such as Alchornea cordifolia, Allophylus africanus, Anthocleista schweinfurthii, Chaetocarpus africanus, Millettia laurentii and others. These strata increase biomass storage capacity through the diameter, height and density of shrub stems.

This study was conducted in Democratic Republic of Congo, in the province of Kwango, chiefdom of Pelende Nord in order to inventory the floristic diversity of forest islands. To study the vegetation, 15 transects 5 meters wide and 60 meters long were set up at random, with 5 transects per forest island. The inventoried plant species were identified using the combination of various identification keys, the botanical classification taking into account Angiosperm Phylogeny Group (APG IV). The results obtained reveal 129 plant species divided into 35 families including 48 species with an average of 25.5 ± 14.4 in the first forest island, 39 species with an average of 20 ± 11.4 in the second forest island and 42 species with an average of 21.5±12.3 in the third forest island. The most represented families are those of Rubiaceae with 45.7%, Euphorbiaceae come second with 42.9% and Fabaceae in third position with 28.6%. This floristic richness shows that if these forest islands are well preserved, they can evolve into forest ecosystems by providing the same ecosystem services.