The Bingerville Botanical Garden is an urban green space which can contribute to the quality of the living environment and to attractivity of tourists in Abidjan city. Its floristic diversity and socio-economic and ecological benefits remain still unknown. The present study was conducted to assess botanical species diversity and the reduction of CO 2 emissions in this space. Trees species with dbh ≥ 10 cm were recorded in 41 plots of 500 m² surveyed in four types of biotopes: two arboretums with 20 and 100 years old, one secondary forest with more than 100 years and a fallow of 20 years old. Floristic indices and aboveground biomass (AGB) were determined for each biotope. A total of 742 trees with dbh ≥ 10 were counted: 127 species. Preponderance species are Cassia siamea, Terminalia mantaly, Milicia excelsa and Ceiba pentandra in arboretums, Pentadesma butyracea and Acacia mangium in the secondary forest, Ficus exasperata and Borassus aethiopum in the fallow. Arboretums are richest (96 species), and they have more AGB (566.7 t/ha). The secondary forest has 71 species with an aboveground equal to 381.4 t/ha. The fallow is less rich (13 species) with an AGB of 21 t/ha. This study has shown the importance of Bingerville Botanical Garden in plant and fighting against climate change. RésuméLe Jardin Botanique de Bingerville (JBB) est un espace vert urbain qui peut contribuer à la qualité du cadre de vie et à l'attractivité des touristes dans la ville d'Abidjan. Ses caractéristiques floristiques et ses bienfaits socio-économiques et écologiques demeurent encore mal connus. La présente étude a été menée pour mettre en exergue le rôle que peut jouer cet espace dans la conservation des espèces végétales et la réduction des émissions de CO 2 . Des inventaires d'espèces arborescentes de dbh ≥ 10 cm, ont été réalisés dans 41 placettes de 500 m² mises en place dans quatre types de biotopes: deux arboretums âgés de 20 et 100 ans, une forêt secondaire de plus de 100 ans et une jachère de 20 ans. Des indices de diversité et la composition floristiques ainsi que la biomasse végétale aérienne ont été déterminés pour chacun de ces biotopes. Au total 742 arbres de dbh ≥ 10 cm ont été recensés. Ils se répartissent entre 127 espèces dont les plus prépondérantes sont Cassia siamea, Terminalia mantaly, Milicia excelsa et Ceiba pentandra dans les arboretums, Pentadesma butyracea et Acacia mangium dans la forêt secondaire, Ficus exasperata et Borassus aethiopum dans la jachère. Les arboretums sont les plus riches (96 espèces); ils présentent la plus forte biomasse aérienne (566,7 t/ha). La forêt secondaire avec 71 espèces, a une biomasse de 381,4 t/ha. La jachère a la plus faible richesse (13 espèces) avec une biomasse aérienne de 21 t/ha. Cette étude démontre l'importance du Jardin Botanique de Bingerville dans la conservation de la diversité arborée et la séquestration du carbone atmosphérique.
The public and private green spaces of the communes of Cocody and Plateau of Abidjan city are deteriorating because of lack of financial means for their maintenance. The overall objective of this study is to demonstrate the importance of payments for ecosystem services (PES) in their self-financing. To carry out this study, a survey was conducted among users of 3 public gardens in the Plateau and private garden owners in Cocody. It aimed to identify the willingness to pay (CAP) of users of public gardens for their management and to identify incentives for the creation of private gardens in their own concessions. Analysis of the data reveals a PAC in the form of visiting tax or voluntary donation ranging from 100 FCFA (0.15 €) to 2000 FCFA (3.07 €). Respondents who declare a visiting tax between 100 FCFA and 500 FCFA are the most numerous with a percentage of 92.95. Students, students and unemployed visitors are on the sidelines of visitors who refuse to pay for the management of public gardens. If we stick to the visit fees proposed by the majority of the interviewees, it would be possible to collect 79,800 FCFA (122.76 €) per day for 339,000 FCFA (521.53 €) for all 3 public gardens. With regard to the creation of private gardens, a financial subsidy mechanism could motivate the population. This study demonstrates that the introduction of payments for ecosystem services could be an incentive for the development of green spaces in urban areas.
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