Biological invasions have many impacts on the composition of flora and soil chemistry. In this study, we analyzed the impacts of an invasive exotic plant, Chromolaena odorata on the floristic diversity and the physico-chemical composition of the soil of the Banco National Park. For this, we compared the floristic and physicochemical parameters of 4 biotopes: forests, ruderal zones without C. odorata, ruderal zones with a young C. odorata invasion and ruderal zones with an old invasion of C. odorata. Floristic inventories and soil samples of 0-20 cm depth were made in quadrats of 4 m2 (2 m x 2 m) of each biotope. A total of 36 quadrats were placed due to 9 repetitions per biotope. The results showed that: Floristically, the ruderal areas with an old invasion of C. odorata had a low floristic richness and a low floristic diversity. In addition, the abundance of native species in these areas was reduced. At soil level, 5 chemical minerals showed significant differences. There are: organic carbon, hydrogen, exchangeable potassium, exchangeable sodium and humus. Our results also showed that areas invaded by C. odorata consume exchangeable potassium as they increase the exchangeable sodium concentrations in soils. Consequently, these two minerals could play an important role in the growth and colonization of environments by C. odorata to the detriment of native plants. Furthermore, ruderal areas with old C. odorata invasion were rich in chemical minerals unlike other biotopes.

Flora of North Cote d

Tropical forests contain large amounts of carbon. Facing the intensive deforestation and degradation of remaining forests, policies developed reforestation programs often including invasive alien species. We analyzed the diversity of plant species in the forest of Angu

After an Environmental and Social Impact Assessment of operating the Agbaou gold mine work, the company ENDEAVOUR MINING agreed to create a refuge area for biodiversity, its gold site. The present study was conducted to assess the plant diversity of this site, and its value for the conservation of flora. Floristic inventories were made in plots of 200 m2 where the presence / absence of all plant species were noted. Circumferences of tree species with dbh ? 5 cm were measured. The particular status species have been identified. Diversity indices were calculated as well as the importance values for tree species. The inventory has identified 358 species of which 31 are among those classified as rare, threatened or having different levels of endemism. These are species such as Cola lorougnonis and Drypetes singroboensis considered by national botanists as missing ivorian flora. The most important tree species are Celtis zenkeri, Pterygota macrocarpa, Mansonia altissima, Ricinodendron heudelotii, Ceiba pentandra and Nesogordonia papaverifera. All these timber species are very popular in the area because overexploitation. Shannon index varies from 1.3 to 3.57 showing a variation in level of plots degradation. The example of the Forest reserve D