Diversité végétale de la Forêt Classée de Yaya au Sud-Est de la Côte d’Ivoire

Cette étude a été conduite afin de contribuer à une meilleure connaissance de la diversité floristique ligneuse de la forêt classée de Yaya. Au total, 50 placettes de 200 m2 ont été disposées dans les différents types d’occupation du sol. Dans chacun des rectangles, tous les individus ligneux de diamètre à hauteur de poitrine (DHP) supérieur ou égale à 10 cm ont été identifiés, comptés et mesurés. Ces Relevés de surfaces couplés aux inventaires itinérants ont permis d’inventorier 167 espèces rangées dans 134 genres que se partagent 47 familles. Les familles les plus importantes dans l’ordre étaient : les Fabaceae, les Euphorbiaceae et les Malvaceae. Les Mésophanerophytes et les mégaphanerophytes étaient dominants avec les pourcentages respectifs de 43% et 35%. L’endozochorie était le mode de dissémination le plus rependu avec un taux de 79%. 14% des espèces recensées dans cette forêt étaient des espèces à statut particulier. Les valeurs moyennes des densités et aires basales des différents biotopes n’étaient pas statistiquement différents, qui indiquent une bonne conservation de la forêt. Ces résultats étaient donc suffisants pour justifier sa protection.   English title: Plant diversity of the Yaya Classified Forest in South-eastern Côte d'Ivoire This study was conducted to contribute to a better knowledge of the woody floristic diversity of the Yaya classified forest. A total of 50 plots of 200 m2 were set up in the different land-use types. In each of the rectangles, all woody individuals with a diameter at breast height (DBH) greater than or equal to 10 cm were identified, counted and measured. These area surveys coupled with the roving surveys resulted in 167 species in 134 genera shared by 47 families. The most important families in order were: Fabaceae, Euphorbiaceae and Malvaceae. Mesophanerophytes and megaphanerophytes were dominant with the respective percentages of 43% and 35%. Endozory was the most common mode of spread with a rate of 79%. 14% of the species recorded in this forest were special status species. The mean values of the densities and basal areas of the different biotopes were not statistically different, which indicates a good conservation of the forest. These results were therefore sufficient to justify its protection

Impact d’une jachère améliorée et du calendrier cultural sur le rendement du maïs dans le Sud de la Côte d’Ivoire

Dans le cadre de la restitution des terres fortement exploités, la jachère améliorée à base de Légumineuses arborées est l’une des techniques agroforestières utilisées. L’objectif de ce travail est d’utiliser le maïs pour tester l’effet d’une jachère à Acacias australiens et du calendrier cultural sur son rendement. Par la méthode de semis à une densité de 25 000 poquets/ha et de 3 grains de maïs par poquet, les résultats suivants ont été obtenus. Sur les parcelles issues de la jachère à légumineuses, le rendement du maïs grains a été estimé à 1240 kg/hectare, le taux de germination des graines est de 84,03% et la vitesse de croissance des plants de maïs enregistrée est de 14,01 cm/semaine. Quant aux parcelles témoins, le rendement a été évalué à 710 kg/hectare, le taux de germination des graines est de 71,18% et la vitesse de croissance des plants de maïs enregistrée est de 9,5 cm/semaine. Les résultats statistiques indiquent trois groupes homogènes pour le rendement du maïs : les PASPMSN ayant enregistré le meilleur rendement ; les PSASPMSN et les PAPMSN ont indiqué un rendement moyen ; les PAPMST sont les moins productives (90 kg/hectare). Les résultats obtenus indiquent un meilleur rendement du maïs sur la jachère à Légumineuses et semé dans le respect du calendrier cultural.© 2015 International Formulae Group. All rights reserved.Mots clés: Maïs, jachère, Acacias, calendrier cultural, rendementEnglish AbstractIn the context of the de la restoration of hardly exploited ground, the improved fallow of leguminous trees is one of agroforestry techniques used. The objective of this work was to use maize to test the effect of one Australian acacias fallow and of the farming calendar on its yield. Using sowing method with a density of 25 000 seed holes/ha and of 3 corn seeds per hole, the following results were obtained. In leguminous fallow plots the corn seeds yield was estimated at 1240 kg/hectare, the seeds germination rate was 84.03% and the recorded growth speed was 14.01 cm/week. As for control plots, the yield was estimated at 710 kg/hectare, the seeds germination rate was 71.18% and the recorded seedlings growth speed was 9,5 cm/week. Statistics results showed three homogeneous groups of maize yield: PASPMSN recorded the best yield; PSASPMSN and PAPMSN indicated the average yield; PAPMST are less productive (90 kg/hectare). The results show a better yield in leguminous fallows and also when farming calendar is respected.© 2015 International Formulae Group. All rights reserved.Keywords: Maize, fallow, acacias, farming calendar, yiel

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

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)

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

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

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

AGRICULTURE AND BIOLOGY JOURNAL OF NORTH AMERICA Variability of production out of fruits of Shea trees

ABSTRACT Vitellaria paradoxa, generally known under the name of shea tree is an endemic fruit tree of sudanese zone of Africa. This tree provides to local populations, tasty fruits, medical products, wood resisting and especially butter, the shea butter, universally known. The activities of research concentrated on the lightening of the constraints of treatment of butter. Thus, in spite of its many uses and its economic importance, the shea tree remains still an entirely wild resource. Its production out of fruits is irregular from one year to another. The irregularity of the production out of fruits makes difficult the industrial exploitation of the plant. The causes of this interannual variability of the production out of fruits were not explained yet. The present study, carried out in the North of Côte d'Ivoire, is an attempt at explanation of the interannual variability of the production out of fruits of the species. It made it possible to highlight, of trees with good regular production beside others with irregular production. The presence of producing good trees in the settlements of shea tree shows that the genetic improvement of the species is possible