Marie MBOLO

Biogeographical patterns of the genera Albizia Durazz., Parkia R. Brown and Tetrapleura Bentham (Mimoseae tribe) in Cameroon

Charly Tchapda, André Njapa Mbiaha, Gislain II Mofack, Danielle Osso, Marie Mbolo

Aim : The overall objective was to conduct a biogeographical study of the genera Albizia, Parkia and Tetrapleura, in order to determine the contribution of species within these genera to the vegetation structure in Cameroon. Location : Cameroon Period : 2026. Main genera studied : Albizia, Parkia and Tetrapleura Methods : The methodology involved the production of 1°×1° grid maps (one square degree) using ArcMap ArcGIS 10.8 software, followed by their analysis and interpretation based on Cameroon’s phytogeographic units and the map of Cameroon’s ecosystems and main natural habitats. Results : It appears that species of these three genera are all present in the Guineo-Congolese Region and the transition zone between the Sudanese and Guineo-Congolese regions. Species of these three genera are sparsely present, or virtually or entirely absent, in the Sudanese Regions. The ecosystems of dense tropical rainforest, mountain forest and tropical wooded savannah have the most diverse distribution patterns for these three genera. Main conclusions : The genus Albizia may serve as a pattern group for secondary forests in the second stage of development due to its absence in the Sudanese Region. As the genus Parkia is represented in all three Regions except the Congolese Domain of the Guineo-Congolese Region, it cannot be considered a pattern group for phytogeography. The genus Tetrapleura, on the other hand, can be considered a pattern group for the Guineo-Congolese Region.

• #african botany and ecology studies
• #plant diversity and evolution
• #biological control of invasive species
• #genus

Biogeographical patterns of the genera Albizia Durazz., Parkia R. Brown and Tetrapleura Bentham (Mimoseae tribe) in Cameroon

Charly Tchapda, André Njapa Mbiaha, Gislain II Mofack, Danielle Osso, Marie Mbolo

Aim : The overall objective was to conduct a biogeographical study of the genera Albizia, Parkia and Tetrapleura, in order to determine the contribution of species within these genera to the vegetation structure in Cameroon. Location : Cameroon Period : 2026. Main genera studied : Albizia, Parkia and Tetrapleura Methods : The methodology involved the production of 1°×1° grid maps (one square degree) using ArcMap ArcGIS 10.8 software, followed by their analysis and interpretation based on Cameroon’s phytogeographic units and the map of Cameroon’s ecosystems and main natural habitats. Results : It appears that species of these three genera are all present in the Guineo-Congolese Region and the transition zone between the Sudanese and Guineo-Congolese regions. Species of these three genera are sparsely present, or virtually or entirely absent, in the Sudanese Regions. The ecosystems of dense tropical rainforest, mountain forest and tropical wooded savannah have the most diverse distribution patterns for these three genera. Main conclusions : The genus Albizia may serve as a pattern group for secondary forests in the second stage of development due to its absence in the Sudanese Region. As the genus Parkia is represented in all three Regions except the Congolese Domain of the Guineo-Congolese Region, it cannot be considered a pattern group for phytogeography. The genus Tetrapleura, on the other hand, can be considered a pattern group for the Guineo-Congolese Region.

• #african botany and ecology studies
• #plant diversity and evolution
• #biological control of invasive species
• #genus

The impact of wood cutting and of bush fires on the dynamics of the herbal strata of Sudano-Guinean Savanna

Ranava Dieudonne, Tchobsala, Ibrahima Wanie Sago, Massai Tchima Jacob, Godwé Gara JM, Ibrahima Adamou and 1 more

Zenodo (CERN European Organization for Nuclear Research)

Few studies were carried out on the impact of wood cutting and bush fires on the dynamics of the herbal strata in savannahs of Adamawa, Cameroon. This study has as objectives to evaluate: 1. the recovery of the vegetation of shrub and grass savanna, 2. the evolution of the number of herbs with regards to time, 3. the floristic and specific contribution of the herbal specie. The inventories of herbaceous plants were carried out through quadra method in 9 sub-plots of 10 m × 10 m for each vegetal formation. The experimental design was split-plot with two (02) factors (savanna trees and shrubs), three (3) treatments (felling without fire, with fire and witness) and three (3) rehearsals/repetitions (portions). The analysis of variance (ANOVA) was used to compare means between treatments by using STATGRAPHIC XVII, and XLSAT to obtain result shown that 103 herbaceous plants divided in 73 genres and 23 families. The rate of recovery of savanna vegetation the herbs are more numerous 60% in the CSF, 50% in the CAF and 45% in witness site (wood savanna), Adversely, 30% in a witness site, 40% in the CSF and 50% in the CAF (shrub savanna). The number the species have grown from 3 to 45 in the tree’s savanna and 2 to 34 for the shrub savanna. The specific contribution of herbaceous varies according to the sites and the species.

• #african botany and ecology studies
• #agroforestry
• #geography
• #geology

Etude comparative de la productivité en pépinière de 2 variétés de cacaoyers dans la Lékié (Région du Centre au Cameroun)

P.H. Youbi, Marie Mbolo, Roger Ngoufo, F. Kaho, Edoa, F.

Zenodo (CERN European Organization for Nuclear Research)

<strong>Résumé</strong><br> Le programme de relance de la filière cacao initié par le Gouvernement camerounais afin d’accroître la production de cacao dans le but d’atteindre 600 000 tonnes à l’horizon 2020, consiste à distribuer gratuitement des plants hybrides considérés comme très productifs aux paysans. Mais la croissance de certains hybrides en pépinière reste mal connue.<br> La présente étude qui concerne un bassin de production de cacao dans la Région du Centre au Cameroun s’est déroulée de juin 2012 à novembre 2015 dans les localités du Département de la Lékié. L’objectif principal a été de comparer la croissance d’un hybride (SNK 413) à celle d’une espèce locale (Bat 1). Cette évaluation a permis d’améliorer les connaissances sur la croissance de cet hybride en pépinière.<br> La mesure de la taille et du diamètre des tiges a été effectuée tous les jours à l’aide d’un ruban gradué pour la taille et d’un pied à coulisse pour le diamètre. La variété SNK 413 présente une tige plus longue et un diamètre plus grand que Bat 1. <br> <strong>Abstract</strong><br> The cocoa project launch by the cameroonian Government to increase production of cocoa in the goal to rich 600 000 tons at 2020, consist of giving free of charge hybrid plants which are supposed very productive to farmers. But the growth of this hybrid is not well known.<br> This study which concerns the cocoa production area of the Centre Region of Cameroon started in june 2012 until november 2015 in many localities of Lékié Division. The main objective of this study was to compare the growth of the hybrid production (SNK 413) to the local specie (Bat 1). This evaluation allowed one to improve the knowledge on the growth of this hybrid in a seed-bed.<br> The measure of length and diameter of stems have been done every day using a graduated waist tape for length and vernier caliper for diameter. The SNK 413 specie has the longest stem and largest diameter compare to Bat 1.

• #agriculture and rural development research
• #geography

Densité du bois et dendrochronologie de quelques espèces forestières tropicales au Cameroun

A. Amougou, J. De Weerdt, Marie Mbolo, Hans Beeckman

• #african botany and ecology studies
• #agriculture and rural development research
• #geography
• #forestry

Impact of Wood Cutting and Bush Fire on the Dynamic of Regeneration in the Guinea Savanna of Adamawa Region

Tchobsala, Ranava Dieudonne, Ibrahima Adamou, Marie Mbolo

International Journal of Current Research in Biosciences and Plant Biology

The aim of this work was to study the impact of wood cutting and bush fire on the dynamics of regeneration of vegetation in the Guinea savanna of Adamawa. Floristic inventories were made by using quadrat method of two factors (shrubby and savanna), three treatments (logging without fire, with fire and control) and three repetitions (parcels). Within each savanna, 09 sites of 10m×10m were delimited using the pocket for both savannas. Data analyses with Xlstat software showed that the regeneration rate is very high in the savanna logging without bush fire. The vegetation structure of both savannas following the dispersal of species in «L» representing the evolution and the higher rate of the regeneration of species after wood logging. The Shannon index respectively in the tree savannas and shrubby savanna is 3.74% and 2.70% for the site cut without fire, 3.61% and 2.53%, for the site cut with fire and 3.75% and 2.80% for the control site. These Shannon indexes show that bush fire and wood cut influence the regeneration of the ligneous. Forbidden wood cut, uncontrolled fire, strict sanction and awareness of the population are the solution for a sustainable management of Guinean savannas.

• #african botany and ecology studies
• #ecology and vegetation dynamics studies
• #agriculture and rural development research
• #quadrat

Population structure and natural regeneration of Allanblackia floribunda oliv. (Clusiaceae) in a forest concession of East Cameroon

Jean Louis Fobane, Elvis Nsoh Ndam, Marie Mbolo

Allanblackia floribunda Oliv. a plant known for its nutritional, economic, industrial and therapeutic qualities is less studied in research centres. Apart from primary studies already carried out, the population structure and natural regeneration arouse much questioning. The follow up of species into FMU 10 044 and on the farmland was realized with the aim of bringing out an in-depth knowledge on the diameter structure, phenology of defoliation, flowering and fructification as well as the dissemination of the diasporas. This study was carried out in a natural forest and cultivated area revealed that A. floribunda is an evergreen species, its foliage is always present independent of the climatic seasons; the size of fruits does not restrain the species to barochory; other chorology types such as zoochory and anthropochory were observed; blossom and fructification take place once a year; flower and fruit outgrowth is different at the level of the branches, trees and population; the distribution of trees by diameter classes revealed that the species regenerates easily under the wood but the follow up of the individuals is weak.

• #african botany and ecology studies
• #botanical research and applications
• #plant diversity and evolution
• #fructification

Impact of wood cuts on the structure and floristic diversity of vegetation in the peri-urban zone of Ngaoundere, Cameroon

Tchobsala, Amougou Akoa, Marie Mbolo

Journal of Ecology and the Natural Environment

The main objective of this paper was to study the impact of various wood cuts on the structure and the floristic diversity of the savannas, and to seek for durable solutions against deforestation during a four year investigation. An inventory of the woody layer on 120 sites areas of 50 × 50 m showed that savannas have structures in L. This structure translate the state of the degradation of the vegetation. The floristic diversity showed that the characteristic species of the degradation of the shrubby savannas area are Hymenocardia acida, Piliostigma thonningii and Annona senegalensis, and those of the wooded savannas are Daniellia oliveri and Cesalpinia sp. It was also shown that highest wood cuts are depressive for the stability of the savannas and for the disappearance of the vegetable biodiversity. Consequently, they are responsible for the acceleration of the degradation and the alarming installation of the desert in wet savannas of Ngaoundere. A measure of co-administration between the government and the bordering population must be therefore encouraged to protect and safeguard the anthropized vegetation.   Key words: Wood cuts, structure, floristic diversity, degradation, reconstitution, Cameroon.

• #historical and environmental studies
• #plant diversity and evolution
• #african botany and ecology studies
• #floristics

PROCESS IN THE HIGH CONSERVATION VALUE (HCV) CONCEPT WITHIN COMMUNITY-MANAGED FORESTS: CASE STUDY OF COPAL AND BB COMMUNITY FORESTS IN CAMEROON

Adje Olivier Ahimin, Marie Mbolo

Journal of Environmental Assessment Policy and Management

The concept of "High Conservation Value" which was initially used by the Forest Stewardship Council, now plays an increasingly important role in several areas, and most significantly in the design and implementation of development projects. Within the framework of certification of community forests in Cameroon, this concept has been implemented in close collaboration with interested communities. Based on the activities conducted, it is worth noting that the consideration of informal management methods appear to result in better protection of biodiversity. Several categories of High Conservation Values were identified in 2 community-managed forests (Coopérative des Paysans de la Lékié &amp; Bimbia Bonadikombo Community Forests) in Cameroon. Rare or endangered ecosystems, more than 300 plant species and more than 20 wildlife species, including endemic, rare, threatened or endangered species were found. Traditional conservation methods based on culture, as well as some ancestral practices and beliefs help to achieve this protection. Decision-makers and academics should learn from this empirical knowledge for protection programmes and projects of biodiversity.

• #agriculture and rural development research
• #conservation, biodiversity, and resource management
• #french urban and social studies
• #stewardship (theology)

Performances productives des elevages caprins et ovins au Liban

G. Srour, Marie Mbolo, S. Abi Saab

HAL (Le Centre pour la Communication Scientifique Directe)

International audience

• #rangeland management and livestock ecology
• #animal diversity and health studies
• #agriculture and rural development research
• #geography

Projet d'appui à la mise à jour de la formation en aménagement forestier et la gestion des concessions forestières dans les écoles forestières d'Afrique centrale. Rapport technique no 1 : Etude des besoins en formation dans le domaine de l'aménagement forestier en Afrique centrale

Marie Mbolo, Daniel Ngantou, Cléto Ndikumagenge, Martin ter Heegde

• #agriculture and rural development research
• #french urban and social studies
• #political science
• #geography

Projet d'appui à la mise à jour de la formation en aménagement forestier et la gestion des concessions forestières dans les écoles forestières d'Afrique centrale. Rapport technique no. 2 : Programme de formation de référence en aménagement forestier pour l'Afrique centrale

Marie Mbolo, Emmanuel Ze Meka, Cléto Ndikumagenge, Martin ter Heegde

• #agriculture and rural development research
• #french urban and social studies
• #political science
• #geography

La collecte et l'analyse des donnees statistiques sur les produits forestiers non ligneux. Une etude pilote au Cameroun

Marie Mbolo, Rome . Dept. des Forets fre Fao, Scott T. Walter, Jeffrey T. LeJeune

• #agriculture and rural development research
• #african botany and ecology studies
• #geography
• #political science

Etat de la recherche botanique et floristique dans la Reserve de la Biosphere du Dja

Amougou Akoa, Marie Mbolo

Systematics and Geography of Plants

Amougou Akoa, Marie Mbolo, Etat de la recherche botanique et floristique dans la Réserve de la Biosphère du Dja, Systematics and Geography of Plants, Vol. 71, No. 2, Plant Systematics and Phytogeography for the Understanding of African Biodiversity (2001), pp. 296-300

• #botany and plant ecology studies
• #diverse scientific research in ukraine
• #geography
• #forestry

La cartographie de la végétation au service de la gestion des écosystèmes forestiers. Cas de la réserve de la biosphère du Dja

Marie Mbolo, A. Amougou, G.S. Ramagazon

Agritrop (Cirad)

• #african botany and ecology studies
• #agriculture and rural development research
• #geography

Régénération du Moabi et du Mukulungu au Cameroun. Perspectives pour l'aménagement

Laurent Debroux, Marie Mbolo, W. Delvingt, Amougou Akoa

BOIS & FORETS DES TROPIQUES

Le moabi (Baillonella toxisperma Pierre) et le mukulungu [Autranella congolensis (De Wild.) A. Chev.] sont deux arbres dominants de la forêt dense humide du Cameroun, de la famille des Sapotacées. Cet article présente les résultats d'essais de germination en pépinière et du suivi de la croissance des plantules pendant 18 mois, au Cameroun. Ces résultats illustrent clairement que les deux espèces ont adopté des schémas de germination très différents. Pour le moabi, la durée de vie latente est courte, le taux de germination très élevé et la croissance des plantules rapide. Au contraire, le mukulungu présente une forte dormance tégumentaire, un faible taux de germination et une croissance lente. Dans l'optique d'un aménagement extensif, on envisage la contribution de ce type de données au fonctionnement d'un modèle démographique qui viserait à contrôler la dynamique de population des essences commerciales. Par ailleurs, on s'interroge sur la possibilité de constituer des groupes d'espèces d'affinité écologique, dans un but sylvicole. Enfin, on examine l'utilisation éventuelle de ces deux espèces en régénération artificielle de complément.

• #agriculture and rural development research
• #geography
• #political science