29 research outputs found

    Floristic and Structural Study of the Dahliafleur Partial Nature Reserve Located in Bingerville (Côte d’Ivoire)

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    The Dahliafleur Partial Nature Reserve, located in the town of Bingerville, is part of the great Ivorian protected area network. Unfortunately, very little is known about its floristic diversity, and even less about the structure of its vegetation. This work intends to characterize its floristic and structural aspects, through 13 surface surveys and an itinerant survey carried out in the northern, central and southern zones of this area. The data analysis revealed that the Dahliafleur Partial Nature Reserve includes 135 species. These species are divided into 110 genera and 53 families. It has 26 special-status species and the highest diversity index of any urban forest. The diametric structure shows histograms in the shape of an "inverted J" for each of the areas. This pattern is typical of a forest in a good state of conservation and with good regeneration capacity

    Floristic and Structural Study of the Dahliafleur Partial Nature Reserve Located in Bingerville (Côte d’Ivoire)

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    The Dahliafleur Partial Nature Reserve, located in the town of Bingerville, is part of the great Ivorian protected area network. Unfortunately, very little is known about its floristic diversity, and even less about the structure of its vegetation. This work intends to characterize its floristic and structural aspects, through 13 surface surveys and an itinerant survey carried out in the northern, central and southern zones of this area. The data analysis revealed that the Dahliafleur Partial Nature Reserve includes 135 species. These species are divided into 110 genera and 53 families. It has 26 special-status species and the highest diversity index of any urban forest. The diametric structure shows histograms in the shape of an "inverted J" for each of the areas. This pattern is typical of a forest in a good state of conservation and with good regeneration capacity

    Floristic and Structural Study of the Dahliafleur Partial Nature Reserve Located in Bingerville (South Côte d’Ivoire)

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    The Dahliafleur Partial Nature Reserve, located in the town of Bingerville, is part of the great Ivorian protected area network. Unfortunately, very little is known about its floristic diversity, and even less about the structure of its vegetation. This work intends to characterize its floristic and structural aspects, through 13 surface surveys and an itinerant survey carried out in the northern, central, and southern zones of this area. The data analysis revealed that the Dahliafleur Partial Nature Reserve includes 135 species. These species are divided into 110 genera and 53 families. It has 26 special-status species and the highest diversity index of any urban forest. The diametric structure shows histograms in the shape of an "inverted J" for each of the areas. This pattern is typical of a forest in a good state of conservation and with good regeneration capacity. This result shows the importance of this reserve for the conservation of floristic biodiversity

    Relations entre la diversité et la biomasse aérienne des espèces arborescentes dans les agroforêts traditionnelles à base de cacaoyers: Cas de la localité de Lakota (Côte d’Ivoire)

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    En matière de gestion durable des systèmes agroforestiers à base de cacao, il serait important de trouver un compromis pour à la fois conserver la biodiversité et les stocks de carbone ; ce qui constituerait une alternative écologiquement soutenable à l’agriculture conventionnelle. En Afrique sub-saharienne, peu d’études ont mis la lumière sur les relations éventuelles entre la biomasse végétale et la diversité biologique dans ces systèmes. La présente étude a permis de tester ces relations dans des agroforêts à cacao de Lakota en Côte d’Ivoire. Des cacaoyères et des forêts ont été inventoriées selon la méthode des transects à aire variable. Plusieurs indices floristiques, ont été calculés et la biomasse aérienne a été estimée, pour les espèces arborescentes de dbh > 2,5 cm. Au total, 215 espèces ont été dénombrées dans l’ensemble des biotopes dont 57,2 % en forêts anciennes, 50,2 % en forêts secondaires et 26 à 45 % dans les plantations. La biomasse aérienne des arbres sur pied dans les forêts anciennes est plus élevée (203,7 t ha-1) que dans les plantations où la biomasse baisse jusqu’à 90,2 t ha-1. Il n’existe pas de relations significatives entre la biomasse aérienne et la diversité des espèces dans les forêts. Dans les plantations âgées de plus de 15 ans, une forte diversité spécifique peut être bénéfique à 20 % dans l’augmentation de la biomasse sur pied. Les pratiques paysannes traditionnelle sen cacao culture peuvent donc garantircon comitamment, la diversité floristique et la biomasse qui est le facteur déterminant dans la séquestration du carbone.Mots Clés: Réchauffements climatiques, système agroforestier, Côte d’Ivoire, activité anthropiqueEnglish AbstractFor sustainable management of cocoa based agroforestry systems, it is important to find a tradeoff to conserve both biodiversity and carbon stock; which would be an ecologically sustainable alternative to conventional agriculture. In Sub-Saharan Africa, few studies have tested relationships between plant biomass and biodiversity in these systems. This study analysed these relationships in Cocoa based agroforest in Lakota area in Côte d’Ivoire. Cocoa farms and forest patches were inventoried using the variable-area transect method. We considered all trees species with dbh> 2.5 cm. Pearson correlation was used to test probable links between aboveground biomass and diversity indexes. We recorded a total of 215 tree species in all habitats, of which 57.2% were in old growth forests, 50.2% in secondary forests and 26-45% in cocoa farms. Biomass stock of old growth forests was greater (203.7 t ha-1) than in plantations, where it dropped to 90.2 t ha-1. There was no significant relationship between aboveground biomass and floristic indices in forests. In old plantations of over 15 years old, high species diversity could contribute up to 20% in the aboveground biomass. The conservation of floristic diversity in cacao based agroforestry systems may represent an important factor in mitigating global warming, through the storage of large amounts of carbon.Keywords: Climate change, cocoa based agroforestry system, Côte d’Ivoire, human activitie

    Etude Socio-Économique De L’exploitation Des Plantes Fourragères Dans Le District d’Abidjan (Côte d’Ivoire)

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    Forage trading in the city of Abidjan is an activity not known by the population. The objective of the study was to determine the importance of the collection of forage plants in the socio-economic life of the actors of the sector. Prospects and semi-structured interviews were conducted, and we determined the floristic composition of forages sold in the market. The results of the survey show that the forage sold by the farmers is taken free of charge in the city of Abidjan. The unit price (UP) of a bundle of forage is on an average of 50 FCFA when there are few animals on the market, and 100 FCFA or 200 FCFA in case of high affluence such as during holidays. Thus, the estimated average financial income per day of an operator during periods of low affluence of animals in the markets is 875 F CFA. On an average, it is 26250 FCFA per month and 3350 FCFA per day. Also, there is an estimated average of 100 400 FCFA in periods of abundance of animals for sale in the market. The results of investigations showed that forages species sold are composed of species such as Chloris pilosa Schumach. (Poaceae), Panicum maximum Jacq (Poaceae), Brachiaria lata (Schumach.) Hub (Poaceae), Arachis hypogea L. (Fabaceae), and Phaseolus vulgaris L (Fabaceae). In addition to being food reserves, these activities provide work for those who exploit them. It allows them to meet their daily needs and also compensate for the lack of jobs

    Domestication De Thunbergia Atacorensis Akoegninou & Lisowski (Acanthaceae) : Effet Du Type De Substrat Et Du Mode D’eclairement Sur L’aptitude A La Reprise Vegetative Des Boutures Et La Croissance Des Plants

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    We studied the possibility of producing seedlings of Thunbergia atacorensis (Acanthaceae) starting from cuttings under controlled cultivation conditions during 3 months. The objective of this work is to determine the optimal conditions for seedling production Thunbergia atacorensis by vegetative reproduction to allow its extension from professional growers and amateur (consumers). The study consisted to analyze their effect the plant growth, seedlings development, and leaves production. At the end the study, we obtained a rate of 91p.c for vegetative recovery for the cutting in shade 97p.c. for the cutting exposing to sun. However, the cuttings exposed sun clearly dissociates cuttings exposed to the shade with a shorter time of recovery. At the end of 3 months, only the sunny seedlings survive despite of the recovery rate of recovery. The study showed that the four environmental factors, the mode of exposure (sun and shade) and time (weeks) have a significant influence on the height and the number of seedlings leaves. The highest seedlings are observed in the shade from weeks 1 to 3. From week 3, only the sunny seedlings continue their growth and their development. The variation of the substrate and the frequency of watering, meanwhile, had no significant influence on the height and number of leaves. In sum, despite of lack of flowering, to produce seedlings of Thunbergia atacorensis, one should initially carry out the propagation by cutting in the shade and then to gradually intensify the light to have well developed seedlings

    Diversité Et Variabilité Du Régime Alimentaire Des Éléphants Du Parc National d’Azagny (Sud - Côte d’Ivoire)

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    In CĂ´te d'Ivoire, Azagny National Park has a small forest elephants population, described as isolated, self-contained and whose survival depends on the diversity of local biological resources. A study was undertaken to assess the diversity of the plant species consumed and the feeding preference of this large mammal. Pedestrian surveys were carried out in the different biotopes traveled by the elephants during one year, in search of fresh and old traces of nutrition and droppings. As a result of these inventories, six organs of 282 plant species have been identified has consumed by elephant. In this plant species list, three families are the most represented: the Apocynaceae, the Euphorbiaceae and the Rubiaceae. Among the elephant diet, five species appear to be the most consumed: Aframomum melegueta (1.45%), Aframomum sceptrum (1.45%), Sacoglottis gabonensis (1.27%), Echinochloa pyramidalis (1.2%) and Albizia adianthifolia (1.2%). Considering the number and type of organs harvested from plants, the study reveals that they varied from one species to another well. In general, leaves (256 species 90.8%) and fruits (95 species or 33.7%) have emerged as the most consumed organs of elephants. In view of this diet importance in elephant survival in the park, it would be important to identify the type of species consumed seasonally and to assess their availability in each of the biotopes traveled

    Technique de Multiplication Végétative par Bouturage de Macaranga beillei Prain (Euphorbiaceae)

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    Macaranga beillei Prain, est une espèce de la famille des Euphorbiaceae. Elle est vulnerable selon l’UICN, endĂ©mique Ă  la CĂ´te d’Ivoire et surtout utilisĂ©e en mĂ©decine traditionnelle. Cette Ă©tude a pour objectif de contribuer Ă  la conservation de cette espèce. De façon spĂ©cifique, il s’agit de faire une analyse floristique, de vĂ©rifier la disponibilitĂ© actuelle de cette espèce et de faire un essai de multiplication vĂ©gĂ©tative de Macaranga beillei afin de permettre sa vulgarisation auprès des utilisateurs. Pour ce faire, des boutures de Macaranga beillei et trois types de substrats (sol en provenance de l’ilot forestier de l’UniversitĂ© Nangui Abrogoua (TfUNA), sol en provenance de la jachère de l’UniversitĂ© Nangui Abrogoua (TjUNA) et sol compostĂ© (Tc) rĂ©alisĂ© Ă  partir des fientes de caille et de coupeaux de bois) ont Ă©tĂ© utilisĂ©s. Il ressort que sur l’ensemble du territoire ivoirien, seulement 72 Ă©chantillons de Macaranga beillei ont Ă©tĂ© rĂ©coltĂ©s. Aussi, sur les 72 Ă©chantillonnĂ©e, 38 soit un taux de 52,77% ont Ă©tĂ© rĂ©coltĂ©s dans le Parc National du Banco. Quant Ă  l’analyse de la disponibilitĂ© actuelle, elle rĂ©vĂ©lĂ© une disparition Ă©minente de l’espèce. Alors que le Parc National du Banco a Ă©tĂ© plĂ©biscitĂ© zone de refuge de Macaranga beillei, cependant, sur les 38 Ă©chantillons rĂ©coltĂ©s par AkĂ© Assi et ses collaborateurs de 1905 Ă  2002, seulement 4 Ă©chantillons ont Ă©tĂ© retrouvĂ©s. Pour ce qui concerne l’essai de multiplication vĂ©gĂ©tative, elle a Ă©tĂ© un succès avec un taux moyen de reprise vĂ©gĂ©tative des boutures de 66,66% contre 33,33% de taux moyen de mortalitĂ©. La valeur de l’indice du risque de vulnĂ©rabilitĂ© de l’espèce (IV), calculĂ© au sujet de Macaranga beillei est de 2,46 ce qui confirme sa vulnĂ©rabilitĂ©. Les plants ont Ă©tĂ© introduits dans la forĂŞt de l’UniversitĂ© Nangui Abrogoua et dans l’arboretum du Centre National de Floristique (CNF) de l’UniversitĂ© HouphouĂ«t Boigny de Cocody.   Macaranga beillei Prain, is a species of the Euphorbiaceae family. It is vulnerable according to the IUCN, endemic to CĂ´te d'Ivoire and mainly used in traditional medicine. This study aims to contribute to the conservation of this species. Specifically, it is a question of carrying out a floristic analysis, checking the current availability of this species and carrying out a vegetative propagation test of Macaranga beillei in order to allow its popularization among users. To do this, cuttings of Macaranga beillei and three types of substrate (soil from the forest island of Nangui Abrogoua University (TfUNA), soil from the fallow land of Nangui Abrogoua University (TjUNA) and soil compost (Tc) made from quail droppings and wood chips) were used. It appears that on the whole of the Ivorian territory, only 72 samples of Macaranga beillei were collected. Also, out of the 72 sampled, 38, representing a rate of 52.77%, were collected in the Banco National Park. As for the analysis of the current availability, it revealed an eminent disappearance of the species. While the Banco National Park was the preferred refuge area of Macaranga beillei, however, of the 38 samples collected by AkĂ© Assi and his collaborators from 1905 to 2002, only 4 samples were found. As for the vegetative propagation test, it was a success with an average rate of vegetative recovery of cuttings of 66.66% against 33.33% average mortality rate. The value of the index of the risk of vulnerability of the species (IV), calculated about Macaranga beillei is 2.46 which confirms its vulnerability. The plants were introduced into the Nangui Abrogoua University forest and into the arboretum of the Center National de Floristique (CNF) of the HouphouĂ«t Boigny University of Cocody

    Technique de Multiplication Végétative par Bouturage de Macaranga beillei Prain (Euphorbiaceae) à Abidjan, Côte d’Ivoire

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    Macaranga beillei Prain, est une espèce de la famille des Euphorbiaceae. Elle est vulnerable selon l’UICN, endémique à la Côte d’Ivoire et surtout utilisée en médecine traditionnelle. Cette étude a pour objectif de contribuer à la conservation de cette espèce en Côte d’Ivoire. De façon spécifique, il s’agit de faire une analyse floristique, de vérifier la disponibilité actuelle de cette espèce et de faire un essai de multiplication végétative de Macaranga beillei afin de permettre sa vulgarisation auprès des utilisateurs. Pour ce faire, des boutures de Macaranga beillei ont été cultivées dans trois types de substrats, à savoir le sol issu de l’ilot forestier de l’Université Nangui Abrogoua (TfUNA), le sol de la jachère de l’Université Nangui Abrogoua (TjUNA) et le sol composté réalisé à partir des fientes de caille et de coupeaux de bois (Tc). Un échantillonnage de 72 individus de l’espèce Macaranga beillei ont été récoltés. Il ressort que 38 sur 72 individus de Macaranga beillei ont été récoltés dans le Parc National du Banco, soit un taux de 52,77%. Quant à l’analyse de la disponibilité actuelle, elle a révélé une disparition éminente de l’espèce. Alors que le Parc National du Banco a été plébiscité zone de refuge de Macaranga beillei, cependant, sur les 38 échantillons récoltés de 1905 à 2002, seulement 4 échantillons ont été retrouvés. Pour ce qui concerne l’essai de multiplication végétative, elle a été un succès avec un taux moyen de reprise végétative des boutures de 66,66% contre 33,33% de taux moyen de mortalité. La valeur de l’indice du risque de vulnérabilité de l’espèce (IV), calculé au sujet de Macaranga beillei est de 2,46 ce qui confirme sa vulnérabilité. Les plants pourraient être introduits dans la forêt de l’Université Nangui Abrogoua et dans l’arboretum du Centre National de Floristique (CNF) de l’Université Houphouët-Boigny de Cocody. Macaranga beillei Prain, is a species of the Euphorbiaceae family. It is vulnerable according to the IUCN, endemic to Côte d'Ivoire, and mainly used in traditional medicine. This paper focuses on contributing to the conservation of this species in Côte d’Ivoire. It includes carrying out a floristic analysis, checking the current availability of this species, and implementing a vegetative propagation test of Macaranga beillei in order to allow its popularization among users. To do this, cuttings of Macaranga beillei were grown in three types of substrates, namely the soil from the forest island of Nangui Abrogoua University (TfUNA), the soil from the fallow land of Nangui Abrogoua University (TjUNA), and composted soil made from quail droppings and wood shavings (Tc). A sampling of 72 individuals of the Macaranga beillei species were collected. It appears that 38 out of 72 individuals of Macaranga beillei were harvested in the Banco National Park, a rate of 52.77%. The Banco National Park was the preferred refuge area of Macaranga beillei. Although 38 samples were collected from 1905 to 2002, only 4 samples were found. As for the vegetative propagation test, it was a success with an average rate of vegetative recovery of cuttings of 66.66% against 33.33% average mortality rate. The value of the index of the risk of vulnerability of the species (IV) is 2.46 which confirms its vulnerability. The plants could be introduced into the Nangui Abrogoua University forest and into the arboretum of the Center National de Floristique (CNF) of the Houphouët-Boigny University of Cocody

    Technique de Multiplication Végétative par Bouturage de Macaranga beillei Prain (Euphorbiaceae)

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    Macaranga beillei Prain, est une espèce de la famille des Euphorbiaceae. Elle est vulnerable selon l’UICN, endĂ©mique Ă  la CĂ´te d’Ivoire et surtout utilisĂ©e en mĂ©decine traditionnelle. Cette Ă©tude a pour objectif de contribuer Ă  la conservation de cette espèce. De façon spĂ©cifique, il s’agit de faire une analyse floristique, de vĂ©rifier la disponibilitĂ© actuelle de cette espèce et de faire un essai de multiplication vĂ©gĂ©tative de Macaranga beillei afin de permettre sa vulgarisation auprès des utilisateurs. Pour ce faire, des boutures de Macaranga beillei et trois types de substrats (sol en provenance de l’ilot forestier de l’UniversitĂ© Nangui Abrogoua (TfUNA), sol en provenance de la jachère de l’UniversitĂ© Nangui Abrogoua (TjUNA) et sol compostĂ© (Tc) rĂ©alisĂ© Ă  partir des fientes de caille et de coupeaux de bois) ont Ă©tĂ© utilisĂ©s. Il ressort que sur l’ensemble du territoire ivoirien, seulement 72 Ă©chantillons de Macaranga beillei ont Ă©tĂ© rĂ©coltĂ©s. Aussi, sur les 72 Ă©chantillonnĂ©e, 38 soit un taux de 52,77% ont Ă©tĂ© rĂ©coltĂ©s dans le Parc National du Banco. Quant Ă  l’analyse de la disponibilitĂ© actuelle, elle rĂ©vĂ©lĂ© une disparition Ă©minente de l’espèce. Alors que le Parc National du Banco a Ă©tĂ© plĂ©biscitĂ© zone de refuge de Macaranga beillei, cependant, sur les 38 Ă©chantillons rĂ©coltĂ©s par AkĂ© Assi et ses collaborateurs de 1905 Ă  2002, seulement 4 Ă©chantillons ont Ă©tĂ© retrouvĂ©s. Pour ce qui concerne l’essai de multiplication vĂ©gĂ©tative, elle a Ă©tĂ© un succès avec un taux moyen de reprise vĂ©gĂ©tative des boutures de 66,66% contre 33,33% de taux moyen de mortalitĂ©. La valeur de l’indice du risque de vulnĂ©rabilitĂ© de l’espèce (IV), calculĂ© au sujet de Macaranga beillei est de 2,46 ce qui confirme sa vulnĂ©rabilitĂ©. Les plants ont Ă©tĂ© introduits dans la forĂŞt de l’UniversitĂ© Nangui Abrogoua et dans l’arboretum du Centre National de Floristique (CNF) de l’UniversitĂ© HouphouĂ«t Boigny de Cocody.   Macaranga beillei Prain, is a species of the Euphorbiaceae family. It is vulnerable according to the IUCN, endemic to CĂ´te d'Ivoire and mainly used in traditional medicine. This study aims to contribute to the conservation of this species. Specifically, it is a question of carrying out a floristic analysis, checking the current availability of this species and carrying out a vegetative propagation test of Macaranga beillei in order to allow its popularization among users. To do this, cuttings of Macaranga beillei and three types of substrate (soil from the forest island of Nangui Abrogoua University (TfUNA), soil from the fallow land of Nangui Abrogoua University (TjUNA) and soil compost (Tc) made from quail droppings and wood chips) were used. It appears that on the whole of the Ivorian territory, only 72 samples of Macaranga beillei were collected. Also, out of the 72 sampled, 38, representing a rate of 52.77%, were collected in the Banco National Park. As for the analysis of the current availability, it revealed an eminent disappearance of the species. While the Banco National Park was the preferred refuge area of Macaranga beillei, however, of the 38 samples collected by AkĂ© Assi and his collaborators from 1905 to 2002, only 4 samples were found. As for the vegetative propagation test, it was a success with an average rate of vegetative recovery of cuttings of 66.66% against 33.33% average mortality rate. The value of the index of the risk of vulnerability of the species (IV), calculated about Macaranga beillei is 2.46 which confirms its vulnerability. The plants were introduced into the Nangui Abrogoua University forest and into the arboretum of the Center National de Floristique (CNF) of the HouphouĂ«t Boigny University of Cocody
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