References of "Bogaert, Jan"
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See detailAmplification of Anthropogenic Pressure Heavily Hampers Natural Ecosystems Regeneration within the Savanization Halo Around Lubumbashi City (Democratic Republic of Congo)
Useni Sikuzani, Yannick; Khoji Muteya, Héritier; Langunu, Serge et al

in International Journal of Environmental Sciences and Natural Resources (2019)

Located in the south-east of the Democratic Republic of Congo (DR Congo), Lubumbashi city is surrounded by a belt of savanna, referred to as “savanization halo”, where rare miombo woodland patches could ... [more ▼]

Located in the south-east of the Democratic Republic of Congo (DR Congo), Lubumbashi city is surrounded by a belt of savanna, referred to as “savanization halo”, where rare miombo woodland patches could be spotted. This study evaluated the impact of anthropogenic activities on changes in the spatio-temporal pattern within that savanization halo between 2002 and 2017. A mapping approach coupled with landscape ecology analysis tools enabled highlighting both the diagnosis of land cover changes and the processes underlying the spatio-temporal dynamics. Results globally attested that the savanization halo was in constant mutation from 2002 to 2017. Importantly, it was apparent that the dissection, fragmentation and attrition of miombo was amplified by the creation and aggregation of savanna and built-up-bare land complex. Wetland attrition was found to be an additional manifestation of natural ecosystem degradation, with the resulting bare soils suggested as being flooded through the creation of waterbody patches. Agricultural and infrastructural development, supported by rapid population growth, no longer allows natural formations (forest and wetland) to recover from disturbances. It is important to reverse the current trend towards complete anthropization within the savanization halo through selective protection of natural ecosystems according to their values. [less ▲]

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See detailLes espaces verts en zone urbaine et periurbaine de Kinshasa en Republique Democratique du Congo
Sambieni, Kouagou Raoul ULiege; Useni, Sikuzani Yannick; Cabala, Kaleba Sylvestre et al

in Tropicultura (2018), 36(3), 478-491

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See detailLa biodiversité des parcelles habitées en zone périurbaine à Kinshasa: déterminants socio-biophysiques et représentations
Sambieni, Kouagou Raoul ULiege; Biloso Moyene, Appolinaire; TOYI, Mireille scholastique et al

in International Journal of Biological and Chemical Sciences (2018), 12(3), 1164-1183

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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 detailQuantification of anthropogenic effects in the landscape of Lubumbashi
Andre, Marie ULiege; Vranken, Isabelle ULiege; Boisson, Sylvain ULiege et al

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

In order to understand the dynamic of the (sub)urbanisation and so, to quantify the anthropogenic effects of the rapid growth of tropical cities, it is crucial to find and apply valuable methods. In this ... [more ▼]

In order to understand the dynamic of the (sub)urbanisation and so, to quantify the anthropogenic effects of the rapid growth of tropical cities, it is crucial to find and apply valuable methods. In this contribution, the transferability of the Rüdisser et al. (2012) «Distance to Nature» hemeroby assessment method to the landscape surrounding the city of Lubumbashi (DRC) is evaluated. That methodology has the advantage of taking structural connectivity into account by computing the distance to natural habitats. As it had never been applied to an African city before, some adjustments (fitting of the local land uses types into the hemeroby levels designed to Austria) and amendments (suppression of the final classification into hemeroby level simplification) are proposed. Moreover, an analysis of the decanal (2002-2013) hemeroby dynamics is presented. Results suggest that the Distance to Nature methodology is transferable but requires good field knowledge to define reference habitats and identify them in the Landsat classified images. There was a dramatic decrease of the «natural» and «near-natural» levels in the study extent during the studied period. In addition, 32% of the land underwent anthropisation increase, mostly around cities and following a ribbon development. [less ▲]

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See detailAnthropisation des paysages katangais
Bogaert, Jan ULiege; Colinet, Gilles ULiege; Mahy, Grégory ULiege

Book published by Les Presses Universitaires de Liège - Agronomie - Gembloux (2018)

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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 detailLa végétation arborée domestique dans le paysage urbain et périurbain de la ville de Kinshasa, République Démocratique du Congo
Sambieni, Kouagou Raoul ULiege; Biloso, Moyene Apollinaire; TOYI, Mireille scholastique et al

in Afrique Science: Revue Internationale des Sciences et Technologie (2018), 14(2), 197-208

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See detailCaractérisation de la croissance spatiale urbaine de la ville de Lubumbashi (Haut-Katanga, R.D. Congo) entre 1989 et 2014
Useni Sikuzani, Y; Cabala Kaleba, S; Halleux, Jean-Marie ULiege et al

in Tropicultura (2018), 36(1), 99-108

A quantification of the spatio-temporal dynamics of urbanization is crucial to apprehend urban morphology and its ecological effects, in order to support sustainable urban planning. This study aimed at ... [more ▼]

A quantification of the spatio-temporal dynamics of urbanization is crucial to apprehend urban morphology and its ecological effects, in order to support sustainable urban planning. This study aimed at understanding the spatial urban growth of Lubumbashi city based on the analysis of six SPOT satellites images. With the exception of the 1996-2002 period, Lubumbashi city underwent a high average annual growth rate exceeding that observed for other cities in sub-Saharan Africa. Between 1989 and 2014, the built-up percentage increased from 6% to 20%. Our results suggest that the urbanization of Lubumbashi city followed a complex diffusion-coalescence model. The main reason of this perturbation is the combination of the rapid demographic growth with an inappropriate urban growth management. © 2018, Agri-Overseas. [less ▲]

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See detailField methods for sampling tree height for tropical forest biomass estimation
Sullivan, Martin J.P.; Lewis, Simon L.; Hubau, Wannes et al

in Methods in Ecology and Evolution (2018), 9

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See detailLes statuts morphologiques d'urbanisation des communes de Kinshasa en Republique Democratique du Congo
Sambieni, Kouagou Raoul ULiege; Messina Ndzomo, J.-P.; Biloso Moyene, A. et al

in Tropicultura (2018), 36(3), 520-530

Cet article met en évidence la forte présence de la périurbanisation à Kinshasa par la caractérisation de son gradient urbain-rural. A partir de l’observation de la morphologie d’urbanisation sur Google ... [more ▼]

Cet article met en évidence la forte présence de la périurbanisation à Kinshasa par la caractérisation de son gradient urbain-rural. A partir de l’observation de la morphologie d’urbanisation sur Google Earth de 34035 mailles carrées de 25 ha chacune, couvrant toute l’étendue de la ville, nous avons réalisé une typologie de ses communes suivant le gradient urbain-rural. Nous avons également étudié l’évolution de la densité de population des différentes zones identifiées. Les résultats renseignent que Kinshasa compte actuellement 15 communes à statut urbain, 4 à statut périurbain et 5 à statut rural. La superficie cumulée des zones périurbaines et rurales représente plus de 96 % de la superficie totale de la ville démontrant le fort potentiel du phénomène de périurbanisation. Nous observons par ailleurs, une tendance de densification dans toutes les zones du gradient urbain-rural avec une situation densimétrique intermédiaire en zone périurbaine. Cette étude offre des données et un cadre théorique pour alimenter des études d’impacts environnementaux à propos de l’urbanisation et pour orienter la planification et l’aménagement des espaces périurbains et ruraux à Kinshasa. [less ▲]

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See detailPan-tropical prediction of forest structure from the largest trees
Bastin, Jean-François; Rutishauser, Ervan; Kellner, James R. et al

in Global Ecology and Biogeography (2018)

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See detailTemporal change of Distance to Nature index for anthropogenic influence monitoring in a protected area and its buffer zone
Almeida, Dayana; Andre, Marie ULiege; Scariot, Eliziane Carla et al

in Ecological Indicators (2018), 91

This study applied and evaluated the temporal change of the Distance to Nature index (D2N) for land use and cover monitoring in the Irati National Forest and its buffer zone (Southern Brazil) between 1986 ... [more ▼]

This study applied and evaluated the temporal change of the Distance to Nature index (D2N) for land use and cover monitoring in the Irati National Forest and its buffer zone (Southern Brazil) between 1986 and 2016. This study addressed the following questions: (1) Which land use dynamics were observed between 1986 and 2016 in the Irati National Forest and its buffer zone? (2) Is the analysis of D2N evolution relevant to assess landscape dynamics in protected areas and their buffer zones? The degree of naturalness decreased after 1986. Statistical analyses showed a significant difference in the D2N values between 1997 and all other years. We observed an increase of D2N values in the 30-year period. The spatial D2N trajectory map between 1986 and 2016 shows where the D2N values changed, and enables us to infer where the differences observed could compromise the ecological condition of the protected area and its buffer zone. The results demonstrate that an analysis by means of D2N can be an effective tool to monitor and assess anthropogenic influences on biodiversity in buffer zones around protected areas. [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 detailLa contribution des camps de déplacés à la dynamique paysagère au sud et au sud-est du Burundi
Havyarimana, F.; Bamba, I.; Barima, Y. S. S. et al

in Tropicultura (2018), 36(2), 243-257

Nowadays, tropical zones are characterized by a catastrophic decline of forest ecosystems areas which play however an important role in climate regulation and biodiversity conservation. There are numerous ... [more ▼]

Nowadays, tropical zones are characterized by a catastrophic decline of forest ecosystems areas which play however an important role in climate regulation and biodiversity conservation. There are numerous and complex causes of deforestation. Even if agriculture is one of the main causes of deforestation in most tropical regions, sub-Saharan Africa had exceptional influences related to social conflicts. In Burundi, socio-political instability which occurred in 1993 also led to massive waves of displaced people, essentially farmers. The present study aims to analyze the land cover spatiotemporal dynamics and focuses particularly on the influence of this population forced to migrate. The study combines satellite images analysis with field observations to analyze land cover dynamic in the camp's surrounding zone. The negative impact of the socio-political instability has been demonstrated by vegetation anthropization decrease when the distance from the camps increases. The greatest anthropogenic pressure which is observed during the period that followed the outbreak of the socio-political instability also confirms this negative impact. The rehabilitation of those deforested or degraded zones is therefore essential. © 2018 Agri-Overseas. [less ▲]

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See detailChapitre 2 : La perception par des experts locaux des espaces verts et de leurs services écosystémiques dans une ville tropicale en expansion : le cas de Lubumbashi
Maréchal, Justine; Useni Sikuzani, Yannick; Bogaert, Jan ULiege et al

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

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See detailChapitre 14 : L'activité minière au Katanga et la perception de ses impacts à Lubumbashi, Kolwezi, Likasi et Kipushi
Amisi Mwana, Yamba; Vranken, Isabelle; Nkulu, Jules et al

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

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See detailChapitre 13 : Activités anthropiques et dynamique spatiotemporelle de la forêt claire dans la Plaine de Lubumbashi
Cabala Kaleba, Sylvestre; Useni Sikuzani, Yannick; Munyemba Kankumbi, François et al

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

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See detailConservation ex situ de la flore cupro-cobalticole du Haut-Katanga en banque de graines
Masengo Kalenga, Wilfried; Boisson, Sylvain ULiege; Lebrun, Julie et al

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

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See detailVariation phénotypique des fruits des écotypes de Dacryodes edulis (G. Dom) H.J. Lam récoltés dans trois zones agro-écologiques de la République Démocratique du Congo
Biloso, Apollinaire; Tsobeng, Alain; Akalakou, Claude et al

in Revue Africaine d'Environnement et d'Agriculture (2018)

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