European Journal of Scientific Research - EuroJournals

408 N'guessan K. Edouard, Kouassi K. Edouard and Sangne Y. Charles
• Two cameras, to photograph plants
The flora of HUTCHINSON and DALZIEL (1954-1972), the works of LEBRUN and STORK
(1991, 1992, 1995, 1997) and the flora of AKÉ ASSI (2001, 2002) were used to name taxa in this
peace of writing.
2.3. Mode of sampling and data processing
2.3.1. Sampling
The botanical surveys were made on a square surface of 2 km side called "grid" (figure 2). In this grid,
it was open 10 tailboards in the East-West direction. On the tailboards, at each 200 meters, parcels of
land with 10 m width and 20 m long were posed. The floristic inventories are carried out on these
surfaces called "points" and on the tailboards connecting the points.
In the points, all the vegetable species are identified and their names noted on the cards of
survey without taking account of their abundance and their frequency. Eight principal types of biotopes
were considered according to types' of vegetation. It is: primary forests, secondary forests, fallow,
reforestations multispecific, cocoa plantations and food crops, the teak reforestation on different dates
(2000, 1994). In the grid, there was only 6 points inventory in primary forest. Thus, in all the other
environments, we chose in a random way, 6 focal points to carry out the analyses of comparison.
Figure 2: Sampling system
2.3.2. Analyze data
2.3.2.1 Floristic diversity
Floristic richness
The floristic richness of a territory is measured by the number of the species listed inside its limits,
taking into account its surface (O.R.S.T.O.M., 1983). Many methods make it possible to evaluate the
floristic diversity of a territory. The floristic richness represents the simplest floristic characteristic of a
territory. Thus, for each type of vegetation considered, we drew up the corresponding floristic list.