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European Journal of Scientific Research ISSN 1450-216X Vol.20 No.2 (2008), pp.406-418 © EuroJournals Publishing, Inc. 2008 http://www.eurojournals.com/ejsr.htm Diversity of a Mosaic Ecosystem in the Surroundings of the Téné Classified Forest (Oumé), Western Center of Côte D'ivoire N'guessan K. Edouard Centre National de Floristique UFR Biosciences, 22 BP 582 Abidjan 22 E-mail: k_nguessan@yahoo.fr Kouassi K. Edouard Centre National de Floristique UFR Biosciences, 22 BP 582 Abidjan 22 Sangne Y. Charles Centre National de Floristique UFR Biosciences, 22 BP 582 Abidjan 22 Abstract The area of Oumé is localised in the Western Center of the Côte d'Ivoire in West Africa. The Botanic inventories carried out on a device called grid, gave 463 vegetable species. This device was established on a field made up of 8 biotopes, in which the anthropic actions are various levels. These surroundings are the primary forests, the secondary forests, the Teak reforestations planted in 1994, the Teak reforestations planted in 2000, the reforestations planted with several Woody species, the cocoa-trees plantations, the food crops and the fallow. Among these biotopes, the most diversified are the secondary forests, on the other hand the least diversified are the Teak 1994 reforestations. The analyses showed that the more the surrounding is exploited, the less it is diversified. But as soon as this anthropic pressure disappears diversity recovers to increase to the disturbed forests, before stabilizing itself in the primary forests. Keywords: Richness, diversity, Biotopes, Oumé and Côte d'Ivoire 1. Introduction The ivoiriens forests formations are constantly subjected to various anthropic pressures of which the most significant are the forestry running and agriculture. These human activities, which largely contributed to the development of the country, also involved a strong degradation and a destruction of the dense forests. Thus, we noted that surfaces of the majority of the primary clump forest decrease regularly with the profit of those of the secondary or degraded forests, of the perennial cultures (coffee, cocoa) and food crops. The zone of study installed on ecological agro units given according to the intensity and of the type of human activity. These units are made up of the primary forest, the secondary forest, the cocoa plantations, the food crops, the fallow and the reforestations. Those various biotopes have each one a particular vegetation and a characteristic flora. That is good to know the flora of these environments and to determine the similarities between them. It is also important to determine the floristic diversity of these ecosystems.
Diversity of a Mosaic Ecosystem in the Surroundings of the Téné Classified Forest (Oumé), Western Center of Côte D'ivoire 407 2. Material and methods 2.1. Zone of study The Classified Forest of Téné is located in the sub-prefecture of Oumé, in the Mid-west of Côte.d'Ivoire (figure 1). The site of the study is a square grid of 2 km side, localised in part in the classified forest and the rural field with its immediate periphery. At the scale of figure 1, the site is materialized by a point whose, the co-ordinates are 6°31' of Northern latitude and 5°30' of Western longitude. According to the phytogeographical subdivisions, this zone belongs to the sub-equatorial climate with an Attien feature. It is characterized by a great raining season from Mars to June, with a maximum of rain in April (203 mm on average); and a great dry season from November to February with a minimum of rain in December (30,2 mm on average). The temperatures vary between 24,1° and 26,7° on average (MIELLOT, J & BERTAULD, J.G., 1980). The vegetation is a semi deciduous forest, witch is characterized by an association of Celtis spp. and Triplochiton scleroxylon (GUILLAUMET & ADJANOHOUN 1971). 2.2. Material Figure 1: Situation of the study area The material used to make up this study includes: • Cards of botanical survey for the establishment of the lists. • Plastic sachets for harvests of plants.
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