Do protected areas really work to conserve species? A case study of three vulnerable woody species in the Sudanian zone of Burkina Faso

Les facteurs climatiques et anthropiques sont à l’origine de la régression de la population de nombreuses espèces ligneuses en zone soudanienne. Anogeissus leiocarpa, Bombax costatum et Detarium microcarpum sont des espèces qui ont une importance socio-économique avérée et donc elles se révèlent être vulnérables. L’évaluation comparée de l’état des peuplements des trois espèces dans les aires protégées et non protégées suivant le gradient climatique permettra de disposer d’informations utiles pour leur gestion durable. La structure des populations a été évaluée à partir d’inventaires forestiers basés sur un échantillonnage aléatoire à travers des parcelles rectangulaires de 1000 m². Les individus dont le diamètre du tronc à 1,3 m de hauteur est supérieur ou égal à 5 cm ont été mesurés. La régénération (individus à D1,3 m < 5 cm) a été comptée par classe de hauteur dans des sous-placettes de 25 m². Les densités et les surfaces terrières des trois espèces varient significativement suivant le gradient de protection dans chaque secteur climatique. A. leiocarpa et D. microcarpum possèdent de bonnes structures démographiques dans les deux secteurs climatiques soudaniens, indépendamment du type d’utilisation de terres. Seule la densité de B. costatum montre une différence significative le long du gradient climatique entre les aires protégées. L’étude révèle l’importance des aires protégées dans la conservation de ces espèces vulnérables.Mots clés : Burkina Faso, zone soudanienne, aires protégées, aires non protégées, espèces vulnérables, conservation. Climate and land use types are mainly responsible for the decline of many woody species in Sudanian areas. Anogeissus leiocarpa, Bombax costatum and Detarium microcarpum are high-value but vulnerable species due to the anthropogenic pressure. The compared assessment of the state of the targeted species in the protected and unprotected areas along the climatic gradient will provide information that could help implementing sustainable management of these species. The population structures were evaluated from forest inventories based on a random sampling through rectangular plots of 1000 m². The adult individuals of each species with diameters ≥ 5 cm at 1.30 m of heigh were measured. The juvenile individual with diameters that were less than 5 cm were counted and classified into height classes within plots size of 25 m². The structural characteristic of the targeted species vary significantly between land uses within each climatic zone. A. leiocarpa and D. microcarpum showed a stable population structure between the two climatic sectors, irrespective of management regimes. Only density of B. costatum shows a significant difference in the PAs and along climatic gradient. The study reveals the importance of protected areas for these vulnerable species conservations.Keywords: Burkina Faso, Sudanian zone, protected areas, unprotected areas, vulnerable species, conservation.

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Woody species composition, diversity and vegetation structure of two protected areas along a climatic gradient in Burkina Faso (West Africa)

Folia Geobotanica ◽

10.1007/s12224-019-09340-9 ◽

2019 ◽

Vol 54 (3-4) ◽

pp. 163-175

Author(s):

Moussa Ganamé ◽

Philippe Bayen ◽

Issaka Ouédraogo ◽

Kangbéni Dimobe ◽

Adjima Thiombiano

Keyword(s):

West Africa ◽

Species Composition ◽

Burkina Faso ◽

Protected Areas ◽

Vegetation Structure ◽

Woody Species ◽

Climatic Gradient

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To What Extent Do Protected Areas Determine the Conservation of Native Flora? A Case Study in the Sudanian Zone of Burkina Faso

ISRN Botany ◽

10.5402/2012/168196 ◽

2012 ◽

Vol 2012 ◽

pp. 1-10 ◽

Cited By ~ 6

Author(s):

Lassina Traoré ◽

Amadé Ouédraogo ◽

Adjima Thiombiano

Keyword(s):

Burkina Faso ◽

Protected Areas ◽

Vegetation Type ◽

Structural Characteristics ◽

Tree Species Composition ◽

Native Flora ◽

The North ◽

Efficient Management ◽

Protected Forests ◽

Sudanian Zone

Natural vegetation contributes significantly to the daily needs of local people especially in the developing countries. This exerts a high pressure on freely accessible natural savannas and jeopardizes the conservation of protected areas. In Burkina Faso, conservation measures, such as the creation of protected forests, have been taken to safeguard the remaining indigenous vegetation. However, little is known about the effectiveness of these protected areas in conserving biodiversity. This study compared the diversity and structural characteristics of the vegetation communities in protected and unprotected areas in the Sudanian zone of Burkina Faso. A total of 208 species representing 41 families and 145 genera were found. Significant differences were found between the species richness in the north Sudanian sector for tree savannas and in the south Sudanian sector for the shrub savannas, tree savannas, savanna woodlands, and the woodlands of land use types. All tree size-class distributions in each vegetation type formed a reverse J-shaped curve, indicating vegetation dominated by juvenile individuals. Similarity in tree species composition between management regimes was found to be low, which reflects differences in habitat conditions, disturbance, and topography. Urgent measures are needed to ensure effective and efficient management and conservation of biodiversity in the protected areas of Burkina Faso.

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Facteurs socio-économiques influençant la biodiversité ligneuse des parcs agroforestiers de deux villages du plateau central du Burkina Faso | Influence of socioeconomic factors on the biodiversity of woody species in agroforestry parkland systems: A case study in two villages in the central plateau of Burkina Faso

Schweizerische Zeitschrift fur Forstwesen ◽

10.3188/szf.2006.0017 ◽

2006 ◽

Vol 157 (1) ◽

pp. 17-23 ◽

Cited By ~ 2

Author(s):

Christoph Abegg ◽

Jules Bayala ◽

Mamounata Belem ◽

Antoine Kalinganire

Keyword(s):

Land Use ◽

Burkina Faso ◽

Woody Species ◽

Central Plateau ◽

Agroforestry Parkland ◽

Plateau Central ◽

Parkland Systems ◽

The Village ◽

Participatory Analysis

Agroforestry parklands face strong pressure from the increasing population of the region. The World Agroforestry Centre (ICRAF Sahel) started a biodiversity project with the objective of developing methods to conserve biodiversity and to improve the situation of the poor rural population. In this context the present study examined the influence of land use unit and the prosperity classes of farmers on the biodiversity of woody species. A wealth ranking classification was carried out and applied to the households of two villages in the central plateau of Burkina Faso using the "Participatory Analysis of Poverty and Livelihood Dynamics" (PAPoLD) method. Thirty farmers of different prosperity classes were chosen and inventories carried out on their different land use units. Statistical analyses show an increase in biodiversity from the village housings. However, no significant influence on biodiversity was observed in connection with a farmer's prosperity class.

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Effects of Piliostigma reticulatum on the Vegetation Dynamic in Sudanian Zone of Burkina Faso

Journal of Plant Studies ◽

10.5539/jps.v6n2p77 ◽

2017 ◽

Vol 6 (2) ◽

pp. 77 ◽

Cited By ~ 1

Author(s):

Yelemou Barthelemy ◽

Abdoulaye Tyano ◽

Babou Andre Bationo ◽

Bassiaka Ouattara ◽

Jonas Koala ◽

...

Keyword(s):

Species Diversity ◽

Burkina Faso ◽

Woody Species ◽

Herbaceous Species ◽

Vegetation Dynamic ◽

Quadrat Method ◽

Shrub Canopy ◽

Point Quadrat ◽

Sudanian Zone ◽

Vegetation Regeneration

This study aims at identifying the effect of P. reticulatum on the vegetation regeneration dynamic in Sudanian fallows of Burkina Faso. Two fallows of about twenty years old have been considered. The point quadrat method was used for herbaceous inventory. Aboveground biomass has been estimated. Moreover, effect of P. reticulatum on the regeneration of others woody species has been studied under, at the limit and out of the shrub canopy. In north Sudanian zone, inventory recorded 39 herbaceous species of which 23 species under the canopy and 16 in open grassland, distributed in 12 families and 22 genera. In south Sudanian zone, species diversity is 41 species from which 23 under the canopy and 18 out of, spread in 16 families and 26 genera. Species higher than 80 cm have been observed only under P. reticulatum canopy in south and north Sudanian zone. In addition, no species of striga met in open sunlight has been observed under the shrub canopy. East and West directions recorded the important proportions of species with individuals belonging to the stratum superior to 100 cm (3.13 and 4.81 % in north direction, 1.47 and 1.73% in south directions).

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