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Woodlands vegetation in Chad have been severely degraded due to climatic deterioration and high anthropogenic pressure which occurred in recent decades, causing significant reduction in plant cover and woody resources. The aim of this study was to evaluate the floristic diversity of the woody species in sudanian parklands H. MBAIYETOM et al. / Int. J. Biol. Chem. Sci. 15(1): 68-80, 2021 69 in the Nya Division (Southern Chad) and to characterize their ecological parameters. The floristic data were collected on 174 floristic surveys’ plots of 2500 m2 each. A total of 29 woody species belonging to 29 genera and 18 families were recorded. The average density was 28,528 stems/ ha and the average basal area for standing stems was of 4,077 m2/ha. The Shannon diversity index was 3,043 and Pielou evenness index was 0,626. The most dominant families were Fabaceae, Sapotaceae and Anacardiaceae. Diameter structures showed a predominance of adult trees over small-diameter stems (4.60%). The chorology of the flora is characterized by the predominance of Sudano-Zambesian species (37.93%). The spectrum of detailed biological forms for the phanerophyte’ subtypes shows a predominance of mesophanerophytes (65.51%) and microphanerophytes (31.03%). These results can be used as a baseline for monitoring the dynamics of the vegetation in savanna woodland areas subject to climatic and anthropogenic pressures. © 2020 International Formulae Group. All rights reserved.

Diversité floristique et structure de la végétation ligneuse des parcs arborés de la zone soudanienne du Tchad