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See detailDynamique de l'occupation du sol autour des sites miniers le long du gradient urbain-rural de la ville de Lubumbashi, RD Congo
Useni Sikuzani, Yannick; Boisson, Sylvain ULiege; Cabala Kaleba, Sylvestre et al

in Biotechnologie, Agronomie, Société et Environnement (2020), 24(1),

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See detailA propos de quelques chenilles consommées par les Mongo en Province de l’Équateur (République démocratique du Congo)
Bocquet, Evelyne ULiege; Maniacky, Jacky; Vermeulen, Cédric ULiege et al

in Geo-Eco-Trop: Revue Internationale de Géologie, de Géographie et d'Écologie Tropicales (2020), 44(1), 109-130

La consommation par l’Homme des larves de Lépidoptères en Afrique connaît un intérêt actuel important. Deux semaines d’observation en Province de l’Équateur de la République Démocratique du Congo auprès ... [more ▼]

La consommation par l’Homme des larves de Lépidoptères en Afrique connaît un intérêt actuel important. Deux semaines d’observation en Province de l’Équateur de la République Démocratique du Congo auprès d’interlocuteurs Mongo et Batwa ont permis de collecter des informations concernant ce thème. Des données au sujet de six espèces ont été collectées, dont une espèce dont la consommation n’avait été signalée que deux fois auparavant, à savoir Nudaurelia anthinoides. Les différentes espèces sont passées en revue. Leurs dénominations locales et celles de leurs plantes nourricières sont citées. Les aires de répartition de la consommation des six espèces présentées sont évoquées sur base de citations antérieures. Les noms locaux révèlent un lien direct entre les plantes et les chenilles qui s’en nourrissent, par dérivation du nom d’une des plantes nourricières. [less ▲]

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See detailTree diversity and structure on green space of urban and peri-urban zones : The case of Lubumbashi City in the Democratic Republic of Congo
Useni Sikuzani, Yannick; Malaisse, François ULiege; Cabala Kaleba, Sylvestre et al

in Urban Forestry and Urban Greening (2019)

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See detailEffects of termite sheetings on soil properties under two contrasting soil management practices
Lejoly, Justine; Cornelis, Jean-Thomas ULiege; Van Ranst, Eric et al

in Pedobiologia (2019), 76

Soil organic matter (SOM) dynamics and termite activity have now been widely accepted as key players forimproving soil properties in tropical agro-ecosystems. Numerous studies have described environmental ... [more ▼]

Soil organic matter (SOM) dynamics and termite activity have now been widely accepted as key players forimproving soil properties in tropical agro-ecosystems. Numerous studies have described environmental impactsof aboveground termite mounds, while few data are available on temporary structures built for food foraging,called termite sheetings. The effects of termite activity on soil properties resulting from organic matter (OM)amendment under two contrasting management practices were studied in similar pedological and climaticconditions in Southern India (Auroville). Our results showed an increase in bio-available nutrients (K, Mg and P),organic carbon (OC) content, cationic exchange capacity (CEC), exchangeable base cations and water pH in thetermite sheetings compared to the underlying and reference soils, in the organic tilledfield. On the other hand,only bio-available K increased in the permanent raised beds. Aggregation processes were improved in termitesheetings for the organic tilledfield, as the amounts of macroaggregates (250μm–2 mm) and protected mi-croaggregates increased, whereas the amount of free microaggregates (50–250μm) decreased. Moreover, termiteactivity favoured SOM storage in termite sheetings by increasing OC content in each aggregate fraction, while nodifferences were observed in the permanent raised beds. Our study demonstrates that termite activity can im-prove nutrient availability, carbon storage and pH conditions in agro-ecosystems but that the magnitude of theeffect likely depends on the agronomic practices in use. [less ▲]

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See detailImbrasia obscura, an Edible Caterpillar of Tropical Africa: Chemical Composition and Nutritional Value
Mabossy-Mobouna, Germain; Malaisse, François ULiege; Richel, Aurore ULiege et al

in Tropicultura (2018), Vol. 36, N° 4

The consumption of Imbrasia obscura (Butler, 1878) has been quoted in a dozen books and papers in five different countries, namely Cameroon, Central African Republic, Congo Republic, Democratic Republic ... [more ▼]

The consumption of Imbrasia obscura (Butler, 1878) has been quoted in a dozen books and papers in five different countries, namely Cameroon, Central African Republic, Congo Republic, Democratic Republic of Congo and Angola. This study presents, for the first time, information concerning two unknown subjects, the chemical composition and the nutritional value of the species. The chemical composition shows that it is a good source of proteins and lipids with the presence of five essential amino-acids (threonine, tyrosine + phenylalanine, histidine and tryptophan) and important amounts of essential fatty acids. The mineral elements such as calcium, phosphorus, magnesium and potassium are also present in good amounts. There is little sodium for which human consumption is frequently excessive. The very high proportion of alpha-linoleic acid contributes very significantly to the low ω-6/ω-3 ratio. Consequently, this caterpillar is a food that may be recommended for human consumption. Farming this species could be encouraged because of its high nutritional value and its good commercial potential especially in areas where malnutrition is common. [less ▲]

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See detailInterprétation paysagère du processus d’urbanisation à Lubumbashi (RD Congo): dynamique de la structure spatiale et suivi des indicateurs écologiques entre 2002 et 2008
Useni Sikuzani, Yannick; Andre, Marie ULiege; Mahy, Grégory ULiege et al

in Mahy, Grégory; Colinet, Gilles; Bogaert, Jan (Eds.) Anthropisation des paysages katangais (2018)

Lubumbashi is one of the fastest growing African cities with annual population growth rates of 5 %. Its urban population growth leads to a rapid urban growth associated with several environmental problems ... [more ▼]

Lubumbashi is one of the fastest growing African cities with annual population growth rates of 5 %. Its urban population growth leads to a rapid urban growth associated with several environmental problems. This study test hypothesis that rapid built-up growth is followed by natural habitats decrease and creates favorable conditions for the spread of Tithonia diversifolia, an invasive specie. From two SPOT satellite images from 2002 and 2008 supported by field visits, seven land cover classes were obtained and the accuracy of the classification was verified. Landscape dynamic has been demonstrated through a transition matrix, by calculating spatial pattern metrics and identification of spatial transformation processes. The results obtained show that built-up covering 32 % of the landscape in 2008 against 22.6 % of the landscape in 2002. Its growth, followed by Tithonia diversifolia and anthropogenic vegetation, operates to the detriment of natural classes. The effect of human impact was translated by the increase of disturbance index which increased from 1.9 to 3.3 in six years, confirming that in the study area, natural classes are removed parallel to aggregation and creating of anthropogenic classes. The study area has undergone significant changes related to urban growth, which implies establishing efficient urban planning and management policies to reverse this trend. [less ▲]

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See detailChanges in the Spatial Pattern and Ecological Functionalities of Green Spaces in Lubumbashi (the Democratic Republic of Congo) in Relation With the Degree of Urbanization
Useni Sikuzani, Yannick; Sambieni, Kouagou Raoul ULiege; Maréchal, Justine et al

in Tropical Conservation Science (2018), 11

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See detailUsing phytostabilisation to conserve threatened endemic species in southeastern Democratic Republic of the Congo
Boisson, Sylvain ULiege; Seleck, Maxime ULiege; Le Stradic, S. et al

in Ecological Research (2018)

Outcrops in the southeastern Democratic Republic of the Congo (DRC) are recognized as some of the largest copper–cobalt orebodies in the world. They support a unique vegetation with nearly 600 ... [more ▼]

Outcrops in the southeastern Democratic Republic of the Congo (DRC) are recognized as some of the largest copper–cobalt orebodies in the world. They support a unique vegetation with nearly 600 metallophytes that include rare and endemic species. Mineral exploitation has increased considerably in the region since the 1900s, affecting both environmental and public health. Phytostabilisation of polluted areas represents an opportunity to decrease the bioavailability of heavy metals in the highly polluted soils that result from ore extraction. Such a technique has been successfully implemented near Lubumbashi with the grass Microchloa altera. However, long-term maintenance requires a good understanding of interspecific relationships, such as competition and facilitation. This study tested the establishment success of four herbaceous species from the Katangan Copperbelt by assessing the potential role of Microchloa altera as a nurse species. Two annual and two perennial species were sown in an experiment designed to study the influence of soil amendment and vegetation cover on seedling emergence, growth, and survival. These variables were monitored during the vegetation growing season as well as resprouting success for perennials. Microchloa altera showed a distinct effect on the emergence and survival of annual and perennial species and negatively affected the growth of individuals belonging to both groups of species. © 2018 The Ecological Society of Japan [less ▲]

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See detailChapitre 16 : Approvisionnement en charbon de bois des ménages lushois : quantités, alternatives et conséquences
Djibu Kabulu, Jean-Pierre; Vranken, Isabelle; Bastin, Jean-François et al

in Bogaert, Jan; Colinet, Gilles; Mahy, Grégory (Eds.) Anthropisation des paysages katangais (2018)

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See detailApprovisionnement en charbon de bois des ménages lushois: quantités, alternatives et conséquences
Djibu Kabulu, Jean-Pierre; Vranken, Isabelle; Bastin, Jean-François et al

in Bogaert, Jan; Colinet, Gilles; Mahy, Grégory (Eds.) Anthropisation des paysages katangais (2018)

Artisanal exploitation of the miombo forest to cover the increased energy needs of the urban centres of the Katanga Province accelerates its regression. We tried to understand the origin of the wood-based ... [more ▼]

Artisanal exploitation of the miombo forest to cover the increased energy needs of the urban centres of the Katanga Province accelerates its regression. We tried to understand the origin of the wood-based energy consumption and have chosen to target the supply of the city of Lubumbashi. Although fuel based on wood and electric power are the two types of energy used, our results indicate that virtually all households make more use of fuel based on wood; 72% of the families only use this type of energy for their household needs. The total quantity of charcoal entering monthly in Lubumbashi in 2008 (months of June and July) by road and by different modes of transport is estimated at 805.4 tons, which corresponds to a minimum consumption of 1 bag of 50 kg of charcoal per household per year. These wood-based fuels are extracted mainly from the immediate hinterland of Lubumbashi, especially from Likasi and Kasenga situated in the north of the city, contributing to 53.5% of all entries. Our observations suggest that, together with the mining industry, the production of charcoal is a major cause of forest fragmentation and degradation in Katanga. In order to protect the forest ecosystems in the region of Lubumbashi, hope relies on electrical energy. [less ▲]

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See detailLe Katanga, une mosaïque d'écosystèmes en mutation: une approche globale
Malaisse, François ULiege

in Bogaert, Jan; Colinet, Gilles; Mahy, Grégory (Eds.) Anthropisation des paysages katangais (2018)

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See detailFourteen years of anthropization dynamics in the Uapaca bojeri Baill. forest of Madagascar
de Haulleville, Thales ULiege; Rakotondrasoa, O. L.; Rakoto Ratsimba, H. et al

in Landscape and Ecological Engineering (2018), 14(1), 135-146

Anthropization of forest landscapes is a major threat to ecosystems and biodiversity. To gather comprehensive information on anthropization dynamics in forest landscapes, fine-scale surveys of ... [more ▼]

Anthropization of forest landscapes is a major threat to ecosystems and biodiversity. To gather comprehensive information on anthropization dynamics in forest landscapes, fine-scale surveys of deforestation are required, coupled with detailed analysis of both spatial transformation processes and forest patch geometry. We conducted such a comprehensive study in a monospecific Uapaca bojeri (Baill.) forest of Madagascar, between 1999 and 2013. A diachronic set of four maps was produced and deforestation rates were calculated. Spatial transformation processes were described using Bogaert et al. (2004) typology. Forest patch geometry was monitored using largest patch index, mean patch size, and squared mean patch size to describe patch size dynamics, mean shape index and area weighted mean shape index to describe patch compactness, and fractal dimension analysis to describe patch outline complexity. For fractal dimension analysis, an innovative segmented regression model (Muggeo 2008) was used to separately quantify fractal dimensions for multiple ranges of patch sizes. Our results showed a growing anthropization of the U. bojeri forest landscape in the area, through a strong yet decelerating deforestation (from − 59.5% year−1 between 1999 and 2005 to − 2.84% year−1 between 2009 and 2013), clear forest fragmentation, and a subtle yet growing-in-scale simplification of patch geometry for small forest patches. Deforestation was artisanal in nature and, in 2013, large patches were withdrawing to less accessible topographic features. Our results forecast a medium-term loss of resilience of the U. bojeri forest in the area, if no direct forest conservation measures are taken. © 2018, International Consortium of Landscape and Ecological Engineering and Springer Japan KK, part of Springer Nature. [less ▲]

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See detailEntandrophragma cylindricum (Sprague) Sprague (Meliaceae), une espèce ligneuse concurrentielle en Afrique centrale (synthèse bibliographique)
Tabi Eckebil, Paule ULiege; Verheggen, François ULiege; Doucet, Jean-Louis ULiege et al

in Biotechnologie, Agronomie, Société et Environnement (2017), 21(1), 80-97

Introduction. De nos jours, la gestion des ressources forestières ne se focalise plus sur l’exploitation exclusive du bois d’oeuvre, mais prend également en considération les produits forestiers non ... [more ▼]

Introduction. De nos jours, la gestion des ressources forestières ne se focalise plus sur l’exploitation exclusive du bois d’oeuvre, mais prend également en considération les produits forestiers non ligneux. Entandrophragma cylindricum (Sprague) Sprague, de son nom commercial « sapelli/sapele », de la famille des Meliaceae, illustre parfaitement cette situation. Le présent article fait un état de l’art des connaissances concernant E. cylindricum et présente quelques informations sur la chenille qui lui est inféodée. Littérature. Le sapelli est une des espèces ligneuses les plus exploitées d’Afrique centrale pour son bois d’oeuvre. Il est répandu dans la forêt dense humide semi-caducifoliée du domaine guinéo-congolais. C’est une espèce semi-héliophile, son mode de dispersion est anémochore et sa phénologie est régulière. Selon la sylviculture appliquée, sa croissance en diamètre peut atteindre jusque 0,82 cm par an. Cette essence est également l’hôte d’une espèce de chenille comestible riche en protéines, I. oyemensis Rougeot. Fortement appréciée par les populations locales, cette chenille fait également l’objet d’un commerce régional et international. Enfin, l’écorce du sapelli est reconnue pour son intérêt ethnobotanique, particulièrement en médecine traditionnelle. Conclusions. Les informations tirées de la littérature ont permis de mettre en évidence certaines lacunes relatives à l’écologie et au mode de reproduction de cette espèce et, ceci, en dépit de son importance pour le commerce du bois. De plus, les inconnues quant à la productivité et la saisonnalité des chenilles d’Imbrasia oyemensis sur cet arbre nécessitent de développer des recherches complémentaires pour garantir la durabilité de l’exploitation simultanée de la ressource ligneuse et non ligneuse et pour proposer des modes de gestion concertés entre exploitants industriels et populations locales. [less ▲]

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See detailCopper and cobalt accumulation in plants: a critical assessment of the current state of knowledge
Lange, B.; van der Ent, A.; Baker, A. J. M. et al

in New Phytologist (2017), 213(2), 537-551

This review synthesizes contemporary understanding of copper–cobalt (Cu–Co) tolerance and accumulation in plants. Accumulation of foliar Cu and Co to > 300 μg g−1 is exceptionally rare globally, and known ... [more ▼]

This review synthesizes contemporary understanding of copper–cobalt (Cu–Co) tolerance and accumulation in plants. Accumulation of foliar Cu and Co to > 300 μg g−1 is exceptionally rare globally, and known principally from the Copperbelt of Central Africa. Cobalt accumulation is also observed in a limited number of nickel (Ni) hyperaccumulator plants occurring on ultramafic soils around the world. None of the putative Cu or Co hyperaccumulator plants appears to comply with the fundamental principle of hyperaccumulation, as foliar Cu–Co accumulation is strongly dose-dependent. Abnormally high plant tissue Cu concentrations occur only when plants are exposed to high soil Cu with a low root to shoot translocation factor. Most Cu-tolerant plants are Excluders sensu Baker and therefore setting nominal threshold values for Cu hyperaccumulation is not informative. Abnormal accumulation of Co occurs under similar circumstances in the Copperbelt of Central Africa as well as sporadically in Ni hyperaccumulator plants on ultramafic soils; however, Co-tolerant plants behave physiologically as Indicators sensu Baker. Practical application of Cu–Co accumulator plants in phytomining is limited due to their dose-dependent accumulation characteristics, although for Co field trials may be warranted on highly Co-contaminated mineral wastes because of its relatively high metal value. © 2016 The Authors. New Phytologist © 2016 New Phytologist Trust [less ▲]

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See detailVingt-cinq ans de monitoring de la dynamique spatiale des espaces verts en réponse á ('urbanisation dans les communes de la ville de Lubumbashi (Haut-Katanga, R.D. Congo)
Sikuzani, Y. U.; Kaleba, S. C.; Khonde, C. N. et al

in Tropicultura (2017), 35(4), 300-311

This study assessed the spatial-temporal dynamics of green spaces in response to urban growth for the seven municipalities of Lubumbashi city, Democratic Republic of the Congo between, 1989 and 2014 ... [more ▼]

This study assessed the spatial-temporal dynamics of green spaces in response to urban growth for the seven municipalities of Lubumbashi city, Democratic Republic of the Congo between, 1989 and 2014. Pattern analysis revealed that since 1989, the built-up proportion has gradually increased in all municipalities at the expense of green space area as a result of rapid demographic pressure coupled with a lack of an appropriate program for their preservation. In terms of pattern dynamics, green space extent has been dominated by attrition, fragmentation and dissection processes. This is opposed to creation and aggregation which characterized built-up areas. Our observations emphasize the need for a sustainable management of green spaces that takes into account the socio- economic context of each municipality. [less ▲]

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See detailLe rayon de déforestation autour de la ville de Lubumbashi (Haut-Katanga, R.D. Congo): Synthèse
Sikuzani, Y. U.; Malaisse, François ULiege; Kaleba, S. C. et al

in Tropicultura (2017), 35(3), 215-221

The Miombo woodland is a type of vegetation widely distributed in Zambezian Africa where it provides timber and non-timber forest products to millions of inhabitants. In Lubumbashi, the causes of its ... [more ▼]

The Miombo woodland is a type of vegetation widely distributed in Zambezian Africa where it provides timber and non-timber forest products to millions of inhabitants. In Lubumbashi, the causes of its degradation, supported by rapid population growth, are mainly: (i) agricultural development, (ii) charcoal production, (Hi) urban expansion, and (iv) mining activities. We present a meta-analysis of the studies that have defined the deforestation radius around Lubumbashi. This radius, used both to express the area (circular area), intensity and the magnitude (distance to the city) of deforestation, was determined through in situ charcoal production and remote sensing. Although the city's ecological footprint is illustrated, estimates of the resulting deforested area do not appear to be consistent because of the variability of methodological protocols within and between approaches. While studies focusing on charcoal production suggest complete Miombo woodland suppression around the city, those based on remote sensing mention the persistence of Miombo patches relatively close to the city and sometimes confuse the different levels of miombo degradation. These observations prevent the development of an appropriate policy for the conservation and sustainable use of the concerned ecosystem. [less ▲]

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See detailModélisation de la dynamique du paysage forestier de la Réserve Speciale d'Ambatovaky (Nord-Est de Madagascar)
Rakotondrasoa, L. O.; Malaisse, François ULiege; Bogaert, Jan ULiege

in Tropicultura (2017), 35(4), 312-324

Madagascar shelters a unique biodiversity that faces numerous threats, such as human activities, which cause deforestation. The objective of this study was to identify the landscape forest's dynamics of ... [more ▼]

Madagascar shelters a unique biodiversity that faces numerous threats, such as human activities, which cause deforestation. The objective of this study was to identify the landscape forest's dynamics of the Reserve Speciale d'Ambatovaky (RSA) from 1996 to 2050 based upon a first order Markov chain model. For this purpose, LANDSAT images of 1996, 2004 and 2014 were used to compose the land cover maps. A transition matrix made it possible to simulate the composition of the landscape until 2050. The results showed that the forest area of RSA decreased and is substituted by a secondary formation called "savoka" that appears several years after the end of agricultural activities. Slash-and-burn agriculture, called locally "tavy", is a common practice of farmers in the coastal areas of Madagascar. Tavy is the main reason for the decline of the forest area. [less ▲]

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See detailSpermatophyta Tecophilaeaceae
Geerinck, Daniel J. L.; Malaisse, François ULiege

Book published by M.S.M. Sosef Jardin Botanique Meise (2017)

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See detailBiodiversité et abondance des termites dans la Réserve Forestière de Yoko (Kisangani, République Démocratique du Congo)
Bakondongama Babapene, Jean; Danakibo Wassi, Michel; Juakaly Mbumba, Jean-Louis et al

in Geo-Eco-Trop: Revue Internationale de Géologie, de Géographie et d'Écologie Tropicales (2016), 40(2), 133-144

Ce travail est une contribution à l’étude de la biodiversité et de l’abondance des termites dans la Réserve Forestière de Yoko à Kisangani. Au total six sorties de terrain ont été effectuées au cours ... [more ▼]

Ce travail est une contribution à l’étude de la biodiversité et de l’abondance des termites dans la Réserve Forestière de Yoko à Kisangani. Au total six sorties de terrain ont été effectuées au cours d’une période de 3 mois, de mars à mai 2013. Les récoltes des spécimens se sont déroulées dans trois habitats différents, à savoir, la forêt primaire, la forêt secondaire et la jachère. Nous avons utilisé la méthode standardisée proposée par Jones et Eggleton (2000), qui consiste à tracer un transect de 100 m de long et 2 m de large pour un habitat donné. Au total, 497 spécimens de termites ont été récoltés. Ils appartiennent à une famille les Termitidae, 4 sous-familles, à savoir les Termitinae, Macrotermitinae, Amitermitinae, Nasutitermitinae, 24 espèces étant reconnues. Pour comparer la biodiversité, nous avons utilisé la méthode de Ramade (1984) où nous avons calculé les indices de biodiversité ci-après : Indice de Shannon Wienner (H’), Indice d’équitabilité (E) et Indice de Simpson (D). De la comparaison des données des trois micro-habitats, il résulte que la forêt primaire est l’habitat le plus diversifié et que la répartition des termites n’est pas équitable dans les trois micro-habitats. Parmi les espèces citées, Unguitermes acutifrons et Basidentitermes maleaensis sont récoltées et signalées pour la première fois pour la région de Kisangani. Concernant la répartition des espèces, la Réserve Forestière de Yoko héberge, dans le cadre de ce travail, 19 espèces en forêt primaire, 15 espèces en forêt secondaire et 13 espèces en jachère. [less ▲]

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See detailAnalyse floristique et phytogéographique de la forêt de la Djoumouna (République du Congo)
Miabangana, Edmond Sylvestre; Lubini Ayingweu, Constantin; Malaisse, François ULiege

in Geo-Eco-Trop: Revue Internationale de Géologie, de Géographie et d'Écologie Tropicales (2016), 40(2), 175-190

La forêt de la Djoumouna est située à 24 km au sud-est de Brazzaville. Pour mieux connaître sa richesse floristique et sa position chorologique, une analyse de la florule, des spectres autoécologiques et ... [more ▼]

La forêt de la Djoumouna est située à 24 km au sud-est de Brazzaville. Pour mieux connaître sa richesse floristique et sa position chorologique, une analyse de la florule, des spectres autoécologiques et phytogéographiques des espèces a été entreprise. Cette étude a été effectuée à partir du matériel floristique provenant de différentes prospections botaniques, collection de référence déposée à l’Herbier National du Congo (IEC). Sur une superficie de 8,5 hectares prospectée, 458 espèces dont quatre nouvelles pour la République du Congo, ont été inventoriées. Elles appartiennent à 102 familles et 309 genres. Les familles des Fabaceae, des Rubiaceae, des Euphorbiaceae, des Poaceae, des Apocynaceae et des Malvaceae sont les plus diversifiées en nombre d’espèces. Les spectres écologiques mettent en évidence la forte représentativité des phanérophytes, des mésophylles, des sarcochores et des espèces de la classe des Strombosio-Parinarietea, confirmant de facto la nature et la maturité forestières du site. Sur le plan phytogéographique, la prépondérance de l’élément base décelé ainsi que la présence de deux familles et de huit genres endémiques, intègrent bien cette florule au Centre d’endémisme guinéo-congolais, au carrefour des domaines congolais et bas-guinéen. En dehors de quelques cas isolés d’impact sur la flore et la végétation, une attention particulière doit être apportée à cet écosystème fragile, en vue de son aménagement à titre conservatoire, de la sauvegarde de sa richesse floristique et comme régulateur du climat local et puits de séquestration du carbone. [less ▲]

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