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Academic literature on the topic 'Foresterie – Cameroun'
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Journal articles on the topic "Foresterie – Cameroun"
NJOUKAM, Raphaël, Pascal CUNY, Jean-Guénolé CORNET, and Jérôme MAURICE. "PROJET DE REBOISEMENT COMMUNAL UN PARISIEN, UN ARBRE AU CAMEROUN : UNE EXPÉRIENCE DE FORESTERIE PARTICIPATIVE." Revue Forestière Française, no. 6 (2013): 527. http://dx.doi.org/10.4267/2042/53987.
Full textKana, Romain, Norbert Sonne, Barthelemy Ondua, Patrick Tadjo, and Benjamin Ondo. "Améliorer la compétitivité du bois de sciage légal en provenance de la zone agroforestière au Cameroun." Afrika Focus 28, no. 2 (2015): 63–81. http://dx.doi.org/10.1163/2031356x-02802005.
Full textNgijol Baleng, Roland Dalex, Elvis Mouyakan A. Moumbock, and Mbezele Junior Yannick Ngaba. "Contribution à l’élaboration d’un plan simple de gestion d’une forêt communautaire : Cas de l’inventaire d’aménagement de la forêt d’Alati (Sud- Cameroun)." Journal of the Cameroon Academy of Sciences 16, no. 1 (2020): 53–69. http://dx.doi.org/10.4314/jcas.v16i1.5.
Full textDissertations / Theses on the topic "Foresterie – Cameroun"
Nkankeu, François. "Les forêts classées du Moungo (Cameroun) : analyse des facteurs de leur évolution et conséquences." Toulouse 2, 2003. http://www.theses.fr/2003TOU20055.
Full textThe objective of this research based on the problems posed by the conservation and the management of forest reserves in the higher agricultural coastal region of Cameroon, and that of Mbanga in particular, is to examine and analyse the various forms of ecological destruction. This study which enlightens us on land problems impairing the Mungo, aim to seek ways and means necessary to reconcile the urgent socio-economic needs of a population in rapid growth and the protection of the biodiversity. This means that the efforts of development must integrated ecological ethics which recognises the vital link between man and nature, the rupture of which would have heavy consequences. Truly, the invasion of the forest reserves in the Mungo by the population is a problem which demands to be solved, but at the same time, the natural equilibrium will not be preserved if the roots of poverty are not extirpated
Tonye, Daniel. "Évaluation de l'impact de la gestion des forêts communautaires au Cameroun." Thesis, Université Laval, 2008. http://www.theses.ulaval.ca/2008/25188/25188.pdf.
Full textFor more than a decade, Cameroon involves in its forest policy, the local communities in the conservation and the sustainable management of the national forest resources and the struggle against poverty. If the process of community forest is a source of hope for some, it could create worries to others because of the difficulties linked to its implementation. The general objective of this study was to integrate the local organizations into the evaluation of the impact of community forest management on the living conditions of local communities in Cameroon. Results of previous studies and a survey conducted in the country revealed clues knowledge of the situation. The survey was conducted to understand the difficulties linked with the acquisition of a community forest and the indicators of their impact on the living conditions of the populations. Thirty two farmers’ organizations which owned communities forests, and four resource persons of the Ministry of forest and fauna (MINFOF) were interviewed. Results showed that, the duration needed to acquire a community forest is long (4 years) for the majority of the organizations (47 %), and the related costs were high, varying between 10 000 000 fcfa and 19 999 995 fcfa, for 47% of the organizations. NGOs played key role in accompanying the organizations who have an established management comity in the process of community forest acquisition. All the interviewed organizations faced difficulties in elaborating their simple management program (SMP). Seventy five per cent (75 %) of the referees quoted the lack of expertise and financial means as main obstacles in the execution of their SMP. Problems rising within the organization are solved by the communities themselves, while those opposing the organizations and external entities are solved through an established authority. A major observation of our study is that, all the organizations agree with the ministerial decision to limit the exploitation of community forest to an artisanal one. Our study reveals also that, SMP has effects on the living conditions of the local communities. But, subsequent studies are necessary to investigate the ecological impact of community forest in Cameroon.
Ngo, Youmba-Batana Friede-Magloire. ""Manger la forêt" Jè lipan, ou la construction sociale de la foresterie en Pays Babimbi au sud du Cameroun." Stuttgart Ibidem-Verl, 2006. http://deposit.d-nb.de/cgi-bin/dokserv?id=2923365&prov=M&dok_var=1&dok_ext=htm.
Full textNgo, Youmba-Batana Friede-Magloire. ""Manger la forêt" : Jè lipan, ou la construction sociale de la foresterie en Pays Babimbi au sud du Cameroun /." Stuttgart : ibidem, 2007. http://deposit.d-nb.de/cgi-bin/dokserv?id=2923365&prov=M&dok_var=1&dok_ext=htm.
Full textDjeugap, Fovo Joseph. "Contraintes de germination et diagnostic moléculaire des champignons associés aux maladies chez Ricinodendron heudelotii au Cameroun." Thesis, Université Laval, 2013. http://www.theses.ulaval.ca/2013/30016/30016.pdf.
Full textThe work described in this thesis was conducted in order to identify the fungal species that are associated with infected organs of Ricinodendron heudelotii (Baill.) Pierre ex Heckel in Cameroon in the perspective of agroforestry. Specifically, objectives were to: 1) identify the advantages and constraints of R. heudelotii for agroforestry in Cameroon and suggest some future research topics for this species; 2) identify germination constraints of R. heudelotii and provide solutions; 3) characterize morphocultural parameters of some suspected pathogenic fungi of R. heudelotii; 4) verify Koch’s postulates for these suspected pathogens; and 5) test the efficacy of four synthetic fungicides against foliar diseases of R. heudelotii seedlings in nurseries. Seed coat dormancy, duration of storage and diseases were the major factors that affected germination in R. heudelotii. Research in the public databases using the BLAST algorithm (Basic Local Alignment Search Tool) and cloned rDNA sequences of isolated fungi (350 isolates) showed that several fungi of phytopathological interest colonized infected organs of R. heudelotii in Cameroon. Culture medium and temperature affected the phenotypic characteristics (pigmentation of the mycelium, growth rate and conidia concentrations) of suspected pathogenic fungi of R. heudelotii, namely Pestalotiopsis microspora, Lasiodiplodia theobromae and three species of the taxon Fusarium oxysporum (F. oxysporum ZB049F, F. oxysporum ZB164T and F. oxysporum ZH121F). These five fungi were pathogenic on detached organs and seedlings of R. heudelotii under laboratory conditions; their aggressiveness on the host varied from one fungal species to another. Fungicides such as Plantomil 72WP (60% copper oxide and 12% metalaxyl) and Nordox 75WG (86% copper oxide) were effective against foliar diseases caused by P. microspora and L. theobromae. Given the great diversity of species in the taxon F. oxysporum and the phytopathological importance of F. solani, further and complete identification of individuals of those species based on molecular markers should be considered.
Nlend, V. Georges Boniface. "Analyse sociologique des causes de la marginalisation des communautés locales et examen des conditions et conséquences de leur capacitation dans la gouvernance forestière au Cameroun." Doctoral thesis, Université Laval, 2018. http://hdl.handle.net/20.500.11794/33430.
Full textAtangana, Alain Rene. "Phenotypic diversity in fruit and seed traits, and neutral genetic diversity in Allanblackia Floribunda." Thesis, Université Laval, 2010. http://www.theses.ulaval.ca/2010/27171/27171.pdf.
Full textAllanblackia floribunda or tallow tree is a tropical forest-tree species that is valued for its seeds, which are rich in hard fat consisting mostly of stearic and oleic acids, reported to lower plasma cholesterol levels, thus reducing the risks of heart attack. Owing to this fat profile, Allanblackia oil is used for margarine production and in soap and ointments manufacture, and seeds extracted from Allanblackia fruits by local communities are traded. We determined whether the species could be genetically improved for fruit/seed production by sampling 17 to 40 fruits from each of 70 trees that were distributed among four sites in wild stands. Fat was extracted from the seeds, and stearic and oleic acid content of the fat was estimated using methods developed in this study. Phenotypic variation in fruit/seed traits was assessed within- and among-trees, and among sites. Repeatabilities were estimated for measured characters, and relationships between these characters investigated. Twenty “plus trees” were selected for breeding, and implications for improvement discussed. Then we isolated and characterized ten microsatellite primer pairs for A. floribunda. Seven of these microsatellite loci were polymorph for both Allanblackia gabonensis and Allanblackia stanerana species as well. Using eight informative microsatellite loci, we have characterized the genetic structure of A. floribunda natural populations from Cameroon, and inferred the recent history of rainforests from Central Africa. No significant difference was identified in genetic parameters between wild stands and the breeding population, indicating that breeding A. floribunda from 20 trees would not reduce nuclear genetic diversity. However, a slight increase in inbreeding was observed in the breeding population, and recommendations for genetic diversity conservation during tree improvement in the species are made.
Seka, Julien Moselly, and Julien Moselly Seka. "Tarifs de cubage et régénération naturelle de Cylicodiscus gabunensis (Okan) au sud Cameroun." Doctoral thesis, Université Laval, 2019. http://hdl.handle.net/20.500.11794/37175.
Full textLa recherche des bois aux propriétés désirées soumet les forêts du bassin du Congo (BC) à une exploitation sélective. La pratique dans le BC est d’utiliser la possibilité et la rotation comme paramètres déterminants de la gestion durable. Cette exploitation se fait avec pour hypothèse que le respect des règles de gestion garantit le maintien en bon état de ces espaces forestiers. L’Okan est une espèce commerciale de bois à haute valeur, endémique des forêts du BC. Il s’agit de la seule espèce du genre Cylicodiscus. Il y a quelques années, l’espèce était peu connue des marchés du bois. L’objectif général de l’étude a été de contribuer à l’aménagement de l’Okan. Cette contribution est reflétée par de meilleures connaissances sur : (i) le prélèvement et (ii) la reconstitution du potentiel ligneux de l’espèce. Le prélèvement a porté sur l’estimation des volumes de bois bruts et commerciaux. La reconstitution a fait l’objet d’intérêt à travers la régénération naturelle au pied de ses semenciers, d’une part et dans ses trouées d’autre part. Des tiges d’Okan ont été mesurées pour produire des tarifs de cubage et des inventaires de régénération ont été effectués au pied des semenciers d’Okan et dans ses trouées. Les résultats sont les suivants : 1) Les tarifs de cubage utilisés au Cameroun pour l’Okan devraient être révisés et complétés. Les tarifs à deux et trois entrées [V=f(DHP, H)], [V=f(DHP, Dx)], [V=f(DHP, H, Dx)] ont de meilleurs R², AIC et RSE que ceux à une entrée. Ces tarifs fournissent un gain de précision même lorsque les méthodes et instruments utilisés sont sujets à des erreurs de mesure, normalement distribuées, de la longueur du fût (écart type ≤ 1,8 m) et du deuxième diamètre (écart type ≤ 3,25 cm). 2) La modélisation de la proportion des rebuts, bien qu’aboutissant à un faible R², est mieux décrite en considérant la longueur du fût et la classe de qualité. En plus de la possibilité d’utiliser des paramètres quantitatifs mesurés sur les fûts, les volumes commerciaux d’Okan sont estimés par : (i) la proportion des rebuts, (ii) l’utilisation d’un classement de qualité (ONADEF, 1992) et (iii) la mesure des longueurs commerciales des fûts. Ces équations peuvent améliorer les estimations des volumes commerciaux de bois d’Okan dans la zone étudiée.
3) Des densités de 5,5 et 2,3 Okan par hectare ont été dénombrées respectivement pour les plantules et la régénération acquise sous le couvert de semenciers d’Okan. La probabilité d’observer des plantules d’Okan est significativement influencée par la distance et son interaction avec l’azimut (par rapport au semencier) (p<0,0001 et p=0,0151), la surface terrière des végétaux autres que les héliophiles (sous-bois) (p=0,0150) et marginalement par la hauteur du semencier (p=0,061). Seules la distance (p < 0,0032) et la hauteur du semencier (p = 0,0416) influencent significativement la probabilité d’observer la régénération acquise. 4) Dans les trouées d’Okan, 74,9% des espèces arborées dénombrées appartiennent au groupe des espèces pionnières, 15% aux héliophiles, 9,3% aux sciaphiles et 0,8% à des groupes indéterminés. L’Okan compte pour moins de 0,03% du total de tiges inventoriées dans ses trouées (soit 6,1 Okan par hectare) et aucune nouvelle régénération d’Okan n’a été observée depuis la coupe. Les variables qui contribuent à expliquer de manière statistiquement significative la probabilité qu’une espèce située en bordure des trouées soit également retrouvée dans la régénération dénombrée à l’intérieur de celles-ci sont son tempérament (p = 6,6e-06), sa fréquence en bordure (p = 0,001) et son mode de dissémination (p = 0,01). Les observations effectuées sous le couvert de ses semenciers et dans les trouées classent l’espèce comme semi-héliophile. La rareté de l’Okan dans ses trouées s’explique, entre autres, par son tempérament, son mode de dissémination (anémochore) et le manque de semenciers aux abords des trouées. En définitive, l’aménagement durable de l’Okan passe d’une part par une révision de ses tarifs de cubage au bois brut et par l’élaboration des tarifs de cubage au bois commercial. D’autre part, des variables expliquant la présence de l’espèce au pied des semenciers et dans les trouées ont été identifiées mais c’est surtout la faible densité de la régénération de l’Okan qui devrait orienter les actions des gestionnaires forestiers. Ces résultats peuvent améliorer la gestion de l’Okan dans les « forêts permanentes ».
3) Des densités de 5,5 et 2,3 Okan par hectare ont été dénombrées respectivement pour les plantules et la régénération acquise sous le couvert de semenciers d’Okan. La probabilité d’observer des plantules d’Okan est significativement influencée par la distance et son interaction avec l’azimut (par rapport au semencier) (p<0,0001 et p=0,0151), la surface terrière des végétaux autres que les héliophiles (sous-bois) (p=0,0150) et marginalement par la hauteur du semencier (p=0,061). Seules la distance (p < 0,0032) et la hauteur du semencier (p = 0,0416) influencent significativement la probabilité d’observer la régénération acquise. 4) Dans les trouées d’Okan, 74,9% des espèces arborées dénombrées appartiennent au groupe des espèces pionnières, 15% aux héliophiles, 9,3% aux sciaphiles et 0,8% à des groupes indéterminés. L’Okan compte pour moins de 0,03% du total de tiges inventoriées dans ses trouées (soit 6,1 Okan par hectare) et aucune nouvelle régénération d’Okan n’a été observée depuis la coupe. Les variables qui contribuent à expliquer de manière statistiquement significative la probabilité qu’une espèce située en bordure des trouées soit également retrouvée dans la régénération dénombrée à l’intérieur de celles-ci sont son tempérament (p = 6,6e-06), sa fréquence en bordure (p = 0,001) et son mode de dissémination (p = 0,01). Les observations effectuées sous le couvert de ses semenciers et dans les trouées classent l’espèce comme semi-héliophile. La rareté de l’Okan dans ses trouées s’explique, entre autres, par son tempérament, son mode de dissémination (anémochore) et le manque de semenciers aux abords des trouées. En définitive, l’aménagement durable de l’Okan passe d’une part par une révision de ses tarifs de cubage au bois brut et par l’élaboration des tarifs de cubage au bois commercial. D’autre part, des variables expliquant la présence de l’espèce au pied des semenciers et dans les trouées ont été identifiées mais c’est surtout la faible densité de la régénération de l’Okan qui devrait orienter les actions des gestionnaires forestiers. Ces résultats peuvent améliorer la gestion de l’Okan dans les « forêts permanentes ».
3) Densities of 5.5 and 2.3 Okan per hectare were recorded for seedlings and established regeneration under the cover of Okan seed trees respectively. The probability of observing Okan seedlings is significantly influenced by distance and its interaction with direction (from the seed tree) (p < 0.0001 and p = 0.0151), basal area of plants (p = 0.0150) other than heliophilous (undergrowth) and marginally by the height of the seed tree (p = 0.061). Only the distance (p <0.0032) and the height of the seed tree (p = 0.0416) significantly influence the probability of observing established regeneration. 4) In the Okan gaps, 74.9% of tree species belong to the group of pioneer species, 15% to heliophilous, 9.3% to sciaphilous and 0.8% to indeterminate groups. Okan accounts for less than 0.03% of the total number of stems counted in its gaps (corresponding to 6.1 Okan per hectare) and no new Okan regeneration has been observed since its felling. Variables that contribute to a statistically significant explanation of the probability that a species located at the edge of the inventoried gaps is also found in the regeneration enumerated within are the guild of the species (p = 6.6e-06), its border frequency (p = 0.001) and its mode of dissemination (p = 0.01). Observations made under the cover of its seed trees and in the gaps classify the species as semi-heliophilous. The rarity of the Okan in its gaps is explained amongst other things by the guild of the species, its mode of dissemination (anemochore) and the lack of seed trees around the gaps. Finally, the achievement of Okan’s sustainable management requires on one hand a revision of its volume equations for gross volume estimates and the elaboration of volume equation to estimate its commercial timber. On the other hand, variables explaining the presence of the species at the foot of the seed trees and in the gaps have been identified but it is the low density of Okan regeneration that should guide the actions of forest managers. These results can improve the management of Okan and other species in permanent forests.
3) Densities of 5.5 and 2.3 Okan per hectare were recorded for seedlings and established regeneration under the cover of Okan seed trees respectively. The probability of observing Okan seedlings is significantly influenced by distance and its interaction with direction (from the seed tree) (p < 0.0001 and p = 0.0151), basal area of plants (p = 0.0150) other than heliophilous (undergrowth) and marginally by the height of the seed tree (p = 0.061). Only the distance (p <0.0032) and the height of the seed tree (p = 0.0416) significantly influence the probability of observing established regeneration. 4) In the Okan gaps, 74.9% of tree species belong to the group of pioneer species, 15% to heliophilous, 9.3% to sciaphilous and 0.8% to indeterminate groups. Okan accounts for less than 0.03% of the total number of stems counted in its gaps (corresponding to 6.1 Okan per hectare) and no new Okan regeneration has been observed since its felling. Variables that contribute to a statistically significant explanation of the probability that a species located at the edge of the inventoried gaps is also found in the regeneration enumerated within are the guild of the species (p = 6.6e-06), its border frequency (p = 0.001) and its mode of dissemination (p = 0.01). Observations made under the cover of its seed trees and in the gaps classify the species as semi-heliophilous. The rarity of the Okan in its gaps is explained amongst other things by the guild of the species, its mode of dissemination (anemochore) and the lack of seed trees around the gaps. Finally, the achievement of Okan’s sustainable management requires on one hand a revision of its volume equations for gross volume estimates and the elaboration of volume equation to estimate its commercial timber. On the other hand, variables explaining the presence of the species at the foot of the seed trees and in the gaps have been identified but it is the low density of Okan regeneration that should guide the actions of forest managers. These results can improve the management of Okan and other species in permanent forests.
The search for wood with desired properties submits the Congo Basin (CB) forests to a selective logging. The practice in the CB is to use the possibility and rotation as key determinants of sustainable management. The hypothesis of this logging is that, the respect of the rules of management guarantees the maintenance in good state of these forest areas. Okan is a commercial timber species of high value, endemic to the CB forest. It is the only species of the genus Cylicodiscus. A few years ago, the species was not well known in the timber market. The main objective of this study was to contribute to the sustainable management of Okan. This contribution is reflected by a better understanding of: (i) wood harvesting and (ii) the reconstitution of the woody potential. Wood harvesting was based on the estimation of gross and commercial volumes. The reconstitution was the subject of interest through the natural regeneration at the foot of the seed trees on the one hand, and in gaps on the other. Okan stems were measured to produce volume equations and inventories were carried out at the foot of the seed trees of Okan and in the gaps of the species. The following results were obtained: 1) The volume equations used in Cameroon for Okan should be revised and completed. Volume equations with two and three entries [V = f (DBH, H)], [V = F (DBH, Dx)], [V = F (DBH, H, Dx)] have better R², AIC, and RSE than those with a single entry. These estimates provide a gain of precision even when the methodology and instruments used are subject to measurement errors, normally distributed, to the length of the stem (standard deviation ≤1.8 m) and of the second diameter (standard deviation ≤ 3.25 cm). 2) The modeling of the proportion of rejects, although resulting in a low R², is better described by considering the length of the stem and quality grade. In addition to the possibility of using quantitative parameters measured on stems, Okan’s commercial volumes are estimated by the: (i) proportion of rejects, (ii) use of a quality grade (ONADEF, 1992) and (iii) measurement of commercial length of stems. These equations can contribute to improve the estimation of commercial volumes of Okan wood in the study area.
The search for wood with desired properties submits the Congo Basin (CB) forests to a selective logging. The practice in the CB is to use the possibility and rotation as key determinants of sustainable management. The hypothesis of this logging is that, the respect of the rules of management guarantees the maintenance in good state of these forest areas. Okan is a commercial timber species of high value, endemic to the CB forest. It is the only species of the genus Cylicodiscus. A few years ago, the species was not well known in the timber market. The main objective of this study was to contribute to the sustainable management of Okan. This contribution is reflected by a better understanding of: (i) wood harvesting and (ii) the reconstitution of the woody potential. Wood harvesting was based on the estimation of gross and commercial volumes. The reconstitution was the subject of interest through the natural regeneration at the foot of the seed trees on the one hand, and in gaps on the other. Okan stems were measured to produce volume equations and inventories were carried out at the foot of the seed trees of Okan and in the gaps of the species. The following results were obtained: 1) The volume equations used in Cameroon for Okan should be revised and completed. Volume equations with two and three entries [V = f (DBH, H)], [V = F (DBH, Dx)], [V = F (DBH, H, Dx)] have better R², AIC, and RSE than those with a single entry. These estimates provide a gain of precision even when the methodology and instruments used are subject to measurement errors, normally distributed, to the length of the stem (standard deviation ≤1.8 m) and of the second diameter (standard deviation ≤ 3.25 cm). 2) The modeling of the proportion of rejects, although resulting in a low R², is better described by considering the length of the stem and quality grade. In addition to the possibility of using quantitative parameters measured on stems, Okan’s commercial volumes are estimated by the: (i) proportion of rejects, (ii) use of a quality grade (ONADEF, 1992) and (iii) measurement of commercial length of stems. These equations can contribute to improve the estimation of commercial volumes of Okan wood in the study area.
Solly, Hilary. ""Vous êtes grands, nous sommes petits": the implications of Bulu history, culture and economy for an Integrated Conservation and Development Project (ICDP) in the Dja Reserve, Cameroon." Doctoral thesis, Universite Libre de Bruxelles, 2002. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211362.
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