Abstract
The general objective of this study is to describe the demographic structure and distribution according to topographic units of two woody species, <i>Boscia senegalensis</i> (Pers.) Lam. Ex Poir and <i>Sclerocarya birrea</i> (A. Rich) Hoscht in Widou Thiengoly (Ferlo) in northern Senegal. Stratified random sampling was used to carry out the study taking into consideration the topographic units (low background, pouring and tray). The ligneous inventory method consisted in carrying out vegetation surveys using a dendrometric approach with a minimum area of 2500 m<sup>2</sup>. The results obtained indicate that in the study area, the population of <i>B. senegalensis</i> is denser (42 ± 7.3 ind/ha) compared to that of <i>S. birrea</i> (6.1 ± 3.4 ind/ha). Topographic variability has a great influence on the life of the species. The study of the structure of individuals in diameter and height classes has shown that the population of <i>B. senegalensis</i> is shrubby and is generally renewed itself well, unlike that of <i>S. birrea</i>, which is more mature and whose lack of regeneration seems to compromise the renewal of the population. Given the total lack of regeneration of the species, this population, therefore requires more effective conservation strategies for its restoration.
Highlights
Since the adoption of the idea of building the Great Green Wall (GMV), the need to share knowledge on the functioning of Sahelian ecosystems, constitutes a crucial step guaranteeing the maximum of chances program success [1, 2]
This study describes the current state of the populations of Boscia senegalensis and Sclerocarya birrea whose evolutionary dynamics are almost opposite in this environment
The results showed that Boscia senegalensis regenerates better in the low background with a rate of (0.68%) followed by the pouring (0.52%) and on the tray the rate is (0.47%)
Summary
Since the adoption of the idea of building the Great Green Wall (GMV), the need to share knowledge on the functioning of Sahelian ecosystems, constitutes a crucial step guaranteeing the maximum of chances program success [1, 2]. Journal of Plant Sciences 2020; 8(5): 167-176 by the creation of permanent water points by borehole [5]. This period is abundantly commented by the mapping and characterization of the Ferlo landscapes in the 1950 [6]. This study allowed to realize modifications induced by drought series on the Ferlo ecosystems. This evolution can be read through the floristic composition, the chorology of the species encountered in the different types of landscapes of Ferlo [7]
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