COMPARISON OF THE DISTRIBUTION AND STRUCTURAL PARAMETERS OF FIVE CHARACTERISTIC SPECIES FROM CAMEROON COASTAL ECOSYSTEMS : DOUALA AND KRIBI
|Nnanga Jeanne Flore1, Priso Richard Jules1*, Ndongo Din1, Kamdem Jean Paul1 and Amougou Akoa2
|Corresponding Author: Priso Richard Jules, E-mail: [email protected]|
|Received: 14 June 2012 Accepted: 19 June 2012|
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This study aimed at determining the diversity of 5 non-timber forest products (NTFPs) and their structural parameters in the Douala and Kribi forests ecosytems. All individuals of Diameter at breast height (dbh) ≥ 5 cm were censured and their diameters measured. The coefficients of abundance-dominance were also determined. In Kribi, specie diversity H'1 was 3.34 with H'1max = 3.89, evenness R1= 0.85. For herbaceous and woody species, H'2 = 3.73 with H'2max = 4.07; the evenness R2 = 0.91. In Douala, H'1 = 2.33 with H'1max = 3.89, evenness R1= 0.59. For woody and herbaceous, H'2 = 2.90 with H'2max = 3.25; the evenness R2 = 0.89. For the diversity of both cities, there was no significant difference (P = 0.59, df = 2). In Kribi, the number of individuals of Baillonella toxisperma was 2; Coula edulis, 32; Irvingia gabonensis, 10; Ricinodendron heudelotii , 8 and Scorodophleus zenkeri, 14 while in Douala, number of individuals of: B. toxisperma was 1; C. edulis, 12; I. gabonensis, 7; R. heudelotii , 7 and S. zenkeri, 0. There was no significant difference in the distribution of species in the study areas (Kribi: df = 8, P = 0.59 > 0.05; Douala: df = 6, P = 0.127 > 0, 05). The diversity of the study areas was fairly high despite the low number of species. The determination of structural parameters showed a vegetation with virtual absence of individuals of very small diameter.