Caractérisation de la structure démographique des ligneux dans les parcs agroforestiers du terroir de Dan Saga (Aguié, Niger)

Abstract

Tree assisted natural regeneration is a preserving technique of woody plants in the agroforestry parklands which is practiced by the population of Dan Saga village for over 20 years. Its impact on structural and ecological characteristics is not determined. This study aims at characterizing the agroforestry parklands of Dan Saga village, to determine the demographic structure of the woody stands. It is also aimed at determining the most dominant and used woody species by the populations. To do this, a forest census was conducted in 80 plots of 2500 m2 (50 m * 50 m) each. Tree natural regeneration was evaluated in smaller plots of 25 m2. The demographic structure built was adjusted to Weibull model with 3 parameters. Results revealed that three different agroforestry parklands were identified namely the Tamarindus indica and Grewia tenax one, the Annona senegalensis and Faidherbia ablida one, and the Albizia knighthood and Cassia singuena one. Structure in diameter of the tree stands and of the dominant species, is characterized by a high density of individual trees in the small diameter classes. These data are useful to plan a sustainable management of these parklands.