Diversité et structure des espaces végétalisés urbains de la ville de Ziguinchor, Sénégal
| Autor: | Mohamed Mahamoud Charahabil, Malaïny Diatta, Bassène Cesar, Baldé Hamadou, Seydou Ndiaye |
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| Rok vydání: | 2018 |
| Předmět: |
Geography
biology Common species Biodiversity Species diversity Ficus Forestry Species richness flore typologie urbanisation zone sacrée Ziguinchor Casamance flora typology urbanization sacred areas Ziguinchor Casamance biology.organism_classification Adansonia digitata Borassus aethiopum Floristics |
| Zdroj: | International Journal of Biological and Chemical Sciences; Vol 12, No 4 (2018); 1650-1666 |
| ISSN: | 1997-342X 1991-8631 |
| DOI: | 10.4314/ijbcs.v12i4.12 |
| Popis: | Dans les pays en developpement les deux tiers de la croissance demographique sont absorbes par les villes. Ce phenomene entraine, et souvent de maniere irreversible, une erosion de la biodiversite vegetale dans les espaces urbains et periurbains. Ce travail, qui constitue une premiere contribution a l’etude des Espaces Vegetalises Urbains (EVU) de la ville de Ziguinchor, a pour objet de mettre en evidence la diversite et l’organisation du peuplement vegetal dans cette ville a urbanisation galopante. Il a ete realise a partir d’inventaires floristiques itinerants realises entre 2014 et 2016. Les resultats presentent la composition floristique des arbres de la ville, leur statut geographique et ainsi que leur organisation spatiale. La diversite floristique montre une richesse de 132 especes reunies dans 95 genres et 32 familles. Les Quatre (4) familles les plus dominantes sont les Fabaceae (19 especes), les Moraceae (18 especes), les Euphorbiaceae (13 especes) et les Apocynaceae (11 especes). Les cinq (5) especes les plus frequentes sont Azadirachta indica avec une frequence relative de 90% suivie de Mangifera indica (69%), d’ Elaeis guineensis (55 %), de Adansonia digitata (52%) et Borassus aethiopum (45%). La typologie des habitats et de la vegetation realisee a partir d’une Analyse Factorielle des Correspondances (AFC) a mis en evidence des zones sacrees pour les populations urbaines tels que les cimetieres et les bois sacres qui conservent des especes rares et menacees tels Cassia sieberiana , Ficus basarensis , Ficus ottoniaefolia , Ficus ovata et Ficus platyphyla . Comparee a la flore des autres villes africaines, la ville de Ziguinchor conserve encore une diversite vegetale originale qui merite plus de regard pour les biens et services non negligeables qu’elle peut apporter aux populations urbaines et periurbaines. © 2018 International Formulae Group. All rights reserved. Mots cles: flore, typologie, urbanisation, zone sacree, Ziguinchor, Casamance English Title: Diversity and structure of urban plant areas of the town of Ziguinchor, Senegal English Abstract In developing countries two-thirds of population growth is absorbed by cities. This phenomenon leads, and often irreversibly, to an erosion of plant biodiversity in urban and peri-urban areas. This work, which is a first contribution to the study of Urban Vegetated Spaces (EVU) of the city of Ziguinchor, aims to highlight the diversity and organization of plant populations in this city with galloping urbanization. It was carried out between 2014 and 2016 through itinerant floristic inventories. The results present the floristic composition of the trees in city, their geographical status and as well as their spatial distribution. The floristic diversity is rich of 132 species distributed in 95 genera and 32 families. The four (4) most dominant families are Fabaceae (19 species), Moraceae (18 species), Euphorbiaceae (13 species) and Apocynaceae (11 species). The five (5) most common species are Azadirachta indica with a relative frequency of 90% followed by Mangifera indica (69%), Elaeis guineensis (55%), Adansonia digitata (52%) and Borassus aethiopum (45%). ). The typology of habitats and vegetation based on a Correspondence Factor Analysis (AFC) has highlighted sacred areas for urban populations such as cemeteries and sacred groves that conserve rare and endangered species such as Cassia sieberiana , Ficus basarensis , Ficus ottoniaefolia , Ficus ovata and Ficus platyphyla . Compared with the flora of other African cities, the city of Ziguinchor still retains an original plant diversity that deserves more attention for the significant goods and services it can bring to urban and peri-urban populations. © 2018 International Formulae Group. All rights reserved. Keywords: flora, typology, urbanization, sacred areas, Ziguinchor, Casamance |
| Databáze: | OpenAIRE |
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