Statistical Methods in Agriculture and Experimental Biology.

From a vascular plant database of Cote d\'Ivoire, 8502 records regarding 758 taxa that consist of 727 species and 31 infraspecific taxa, 258 genera and 63 families of humid forest area climbers were extracted. Taxa which occur commonly in the Upper Guinea forest area of Cote d\'Ivoire including the coastal forests, the lowland evergreen forests, the semi-deciduous forests and the montane forests had been taken in account in this survey. Their biologic types and phytochories were furnished De la base de donnees sur les plantes vasculaires de la Cote d\'Ivoire, 8502 saisies relatives a 758 taxons repartis entre 727 especes et 31 taxons infraspecifiques, 258 genres et 63 familles de lianes de la zone de foret dense humide ont ete extraites. Les taxa distribues frequemment dans les forets denses de la Haute Guinee, au niveau de la Cote d\'Ivoire, constituees par les forets cotieres, les forets sempervirentes de basses altitudes, les forets denses semidecidues et les forets montagnardes ont ete pris en compte dans cette etude. Leurs types biologiques et les phytochories ont ete fournis. Keywords : climbers, taxa, Upper Guinea forest area, Cote d\'Ivoire./lianes, taxons, zone de forets de la Haute Guinee, Cote d\'Ivoire. Sciences & Nature Vol. 4 (2) 2007: pp. 149-169

Checklist of the Upper Guinea forest area climbers of Côte d\'Ivoire

This study analyses the effects of anthropogenic disturbance on trees and shrubs floristic α-diversity in two protected rain forests in southwestern Cote d’Ivoire. These forests have been under timber harvesting since their protection in 1929. The forestry service had developed plantations of indigenous timber species and teak since 1996 to increase their productivities for timbers. Additionally, they host many plantations of cash crop among which coffee, cocoa and rubber are the most important. To understand how these plantations affect the local flora, the diversity of shrubs and trees with DBH ≥ 10 cm was analyzed through the species number and diversity indices. Plots were of 20 m x 50 m size and a total of 10 per vegetation type. Highest species numbers, Shannon-Wiener’s index, Hill’s index and Pielou’s index, in both plots and vegetation types were found in natural forest and undergrowth cleared forest which had similar values of these parameters. Plot richness was ranked between 1 and 7 species whilst vegetation type richness varied from 4 to 12 species for all plantations. Yet Simpson’s diversity index showed highest values in plantations. Richness in plantation was influenced by the location of plantation site and the nature of crop but no influence was found with the combination site and crop nature.

	 

	Key words: Forest protection, cash crops, agroforestry, flora and diversity, South-West Cote d’Ivoire.

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Olivier Adje Ahimin

Papers

Floristic diversity under anthropogenic activities in the protected forests of Duekou and Scio in southwestern Cte dIvoire