Phytogéographie du Parc national de Zakouma (Sud-Est du Tchad)

Poilecot, Pierre; Saïdi, Slim; N’Gakoutou, Etienne Bemadjim

doi:10.1684/sec.2009.0195

Cited by 9 publications

(10 citation statements)

References 5 publications

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“…Along streams in the north Benin, species such as Berlinia grandiflora, Khaya senegalensis are encountered in riparian forest of streams in Burkina Faso too. Diospyros mespiliformis, Piliostigma reticulatum, Mitragyna inermis, Acacia seyal, Anogeissus leiocarpa encountered in riparian forest along temporary rivers are encountered in riparian forests at national park of Zakouna in South East of Tchad (Poilecot et al 2009). Flora of riparian forest of rivers is more dependent of frequent floods than the flora along streams, where the surrounding vegetation greatly influences stream side vegetation (Meave et Kellman 1994;Natta 2003).…”

Section: Discussionmentioning

confidence: 99%

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Woody species composition, diversity and structure of riparian forests of four watercourses types in Burkina Faso

Sambaré

Bognounou

Wittig

et al. 2011

Journal of Forestry Research

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Riparian forests are classified as endangered ecosystems in general, particularly in sahelian countries like Burkina Faso because of human-induced alterations and civil engineering works. The modification of this important habitat is continuing, with little attention being paid to the ecological or human consequences of these changes. The objective of this study is to describe the variation of woody species diversity and dynamic in riparian forests on different type of watercourse banks along phytogeographical gradient in Burkina Faso. All woody species were systematically measured in 90 sample plots with sides of 50 m × 20 m. Density, dominance, frequency and species and family importance values were computed to characterize the species composition. Different diversity indices were calculated to examine the heterogeneity of riparian forests. A total of 196 species representing 139 genera and 51 families were recorded in the overall riparian forests. The species richness of individuals with dbh ≥ 5cm increased significantly from the North to the South along the phytogeographical gradient and varied significantly between the different types of riparian forests. Similarity in tree species composition between riparian forests was low, which indicates high beta diversity and reflects differences in habitat conditions and topography. The structural characteristics varied significantly along the phytogeographical gradient and between the different types of riparian forests. The diameter class distribution of trees in all riparian forests showed a reverse "J" shaped curve except riparian forest of stream indicating vegetation dominated by juvenile individuals. Considering the ecological Foundation project: This work was financially supported by University of Frankfurt and BIOTA West project The online version is available at Responsible editor: Chai Ruihai importance of riparian forest, there is a need to delineate and classify them along watercourses throughout the country.

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Section: Discussionmentioning

confidence: 99%

“…In savannah area of sudano-sahelian zone Combretaceae and Mimosaceae are the most important families in the ligneous strata (Ouédraogo 2006;Poilecot & al. 2009).…”

Section: Discussionmentioning

confidence: 99%

Woody species composition, diversity and structure of riparian forests of four watercourses types in Burkina Faso

Sambaré

Bognounou

Wittig

et al. 2011

Journal of Forestry Research

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“…Les relevés, distribués de manière régulière, sont espacés de 600 m selon une grille orientée nord-sud et est-ouest. Le choix de cette distance (Poilecot et al, 2009) vise essentiellement à ne pas négliger l'hétérogénéité floristique du site. Chaque relevé est ainsi géoréférencé et a pu être positionné sur l'image satellite du site (figure 3).…”

Section: Données Floristiquesunclassified

Approcher la densité des ligneux par l’indice perpendiculaire de végétation : cas d’une savane arborée au nord de la Tanzanie

Saïdi¹,

Louppe

Bel

2018

Bois for. trop.

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Le domaine de Namalok (4 500 ha), situé au nord-est de la Tanzanie, a été protégé par TPC Limited, une société sucrière privée, pour en faire une réserve privée de faune et de flore. La végétation locale est constituée de savanes arbustives à Salvadora persica, de fourrés de Suaeda monoica et de savanes arborées plus au moins denses à Acacia xanthophloea, Faidherbia albida et Acacia tortilis. Afin de répondre à un objectif de gestion suite à la réintroduction de grands herbivores, la composition floristique de ces formations ligneuses a été étudiée en association avec une approche cartographique du degré d’accessibilité des formations ligneuses par les herbivores, exprimé en classes de densité établies selon l’indice perpendiculaire de végétation (IPV). Les résultats révèlent tout d’abord une corrélation très élevée entre la densité calculée des ligneux et l’IPV (r2 = 0,96) et confirment l’intérêt de l’approche proposée d’analyse d’images satellitaires. Dans une perspective plus locale, ils montrent aussi que, sur le plan floristique, les niveaux successifs des densités cartographiées sont composés de 70 espèces végétales et relèvent d’un fond floristique d’espèces pantropicales. Ces savanes montrent également une distribution spécifique relativement équitable et très diverse, avec des fréquences spécifiques voisines les unes des autres. Les savanes arborées représentent 38 % de la surface du domaine. Par ordre croissant de densité, les savanes de moins de 100 arbres/ha couvrent 836 ha, celles comptant 100 à 200 arbres/ha occupent 654 ha et celles ayant des densités de 200 à 300 arbres/ha sont assez peu importantes et n’occupent que 206 ha. Les savanes de densité supérieure à 300 arbres/ha représentent des étendues beaucoup moins vastes, soit seulement 22 ha.

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“…savannah (covering 25.6% of the total area), Combretaceae savannah (66.7%) and herbaceous swamp savannah (7.3%) (Dejace 2002, Poilecot et al 2009). …”

Section: Location and Sampling Sitementioning

confidence: 99%

Evolution of large mammal populations and distribution in Zakouma National Park (Chad) between 2002 and 2008

Poilecot

N’Gakoutou²,

Taloua³

2010

Mamm

Self Cite

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The relatively scarcely known Zakouma National Park serves as a real sanctuary for Chad's Sudanese fauna owing to the possibility of permanent access to standing water throughout the dry season. With a density of elephants approaching an animal per square kilometre this protected area is exceptional for the species in West Africa. A census by systematic sample counts from the air in 2002 showed that the numbers of most species of large herbivore had increased from those of 1986. A new census using the same method was undertaken during the 2008 dry season with the aim of acquiring another estimate of the numbers of the large mammal species and to verify recent reports of an upsurge in elephant poaching. Comparison of the two censuses shows that large mammal populations were stable or increasing for all species except elephant that showed a drastic decline. Evidence of poaching on a large scale, including the presence of numerous recent carcasses, is enough to explain this decline. Although some species, waterbuck and topi, occupied the same areas in both censuses others, buffalo, roan antelope and hartebeest, had ranges that extended farther west in the park in 2008. (Résumé d'auteur

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Phytogéographie du Parc national de Zakouma (Sud-Est du Tchad)

Cited by 9 publications

References 5 publications

Woody species composition, diversity and structure of riparian forests of four watercourses types in Burkina Faso

Woody species composition, diversity and structure of riparian forests of four watercourses types in Burkina Faso

Approcher la densité des ligneux par l’indice perpendiculaire de végétation : cas d’une savane arborée au nord de la Tanzanie

Evolution of large mammal populations and distribution in Zakouma National Park (Chad) between 2002 and 2008

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