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[ Article ] Population structure of the widespread species, Anogeissus leiocarpa (DC.) Guill. & Perr. across the climatic gradient in West Africa semi-arid area

Date de soumission: 23-09-2016
Année de Publication: 2013
Entité/Laboratoire Laboratoire de Biomathématiques et d'Estimations Forestières (LABEF)
Document type : Article
Discipline(s) : Sciences Environnement &Ecologie
Titre Population structure of the widespread species, Anogeissus leiocarpa (DC.) Guill. & Perr. across the climatic gradient in West Africa semi-arid area
Auteurs
Journal: South African Journal of Botany
Catégorie Journal: Africaine
Impact factor: 0.978
Volume Journal: 88
DOI: 10.1016/j.sajb.2013.07.029
Resume In the climate change context, widely distributed plant species can serve as relevant barometers of ecosystems' sensitivity or resilience to disturbances. This study aimed at assessing the population structure and individual morphological traits of Anogeissus leiocarpa, a widespread tree species, across a broad strip of land, from the north to the south of Burkina Faso. We compared stands in four phytogeographical zones in order to analyze mor- phological variations in trees and recruits density, individual size and their spatial structure. Our results showed significant increase of tree density from the Sahel (77.1 trees/ha) to the South-Sudanian (166 trees/ha) while di- ameter, height and basal area had an opposite trend. No recruits were found in the Sahel stands, while their den- sity increased from the Sub-Sahel (5.17 individuals/ha) to the South-Sudanian (6.46 individuals/ha). Tree diameters revealed positive asymmetric distributions in the Sudanian and Sub-Sahel whereas the Sahel stands showed a symmetric distribution. Height structure of saplings revealed “J reverse” shape in Sudanian stands while Sub-Sahelian ones exhibited Gaussian shape. Height–diameter relationships revealed thin trees towards the south-Sudanian. The spatial structure of trees indicated random distributions in all zones whereas recruits presented aggregative distribution trend in the Sudanian zones. A. leiocarpa's trees have a good ability to support broad climatic fluctuations but the populations' rejuvenation is unpredictable in the extreme harsh conditions. The species is fairly resilient to anthropogenic disturbances in Sub-Sahel and Sudanian zones. However, manag- ing issues should pay attention to the species communities by considering its demographic behavior in the health state appreciation of ecosystems.
Mots clés Anogeissus leiocarpa, Latitudinal variation, Population structure, Recruitment, Spatial distribution, Burkina Faso
Pages 286 - 295
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