References of "Mahy, Grégory"
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See detailFactors of Variation of Soil Chemical Properties in Metalliferous Ecosystems of Tenke-Fungurume, Katanga, D. R. Congo
Kaya Muyumba, Donato ULiege; Ilunga wa Ilunga, Edouard; Faucon, Michel-Pierre et al

in Tropicultura (in press)

Our study aimed at deepen our understanding of relationships between soil properties and vegetation distribution in metalliferous ecosystems of Tenke-Fungurume in the Democratic Republic of Congo. The ... [more ▼]

Our study aimed at deepen our understanding of relationships between soil properties and vegetation distribution in metalliferous ecosystems of Tenke-Fungurume in the Democratic Republic of Congo. The first question concerned the differences and similarities between soils of the main vegetation units and four variation factors of soil properties were summarized by multivariate analysis. They were all linked to lithology and significantly contributed to explain the distribution of vegetation units. Our result suggest that the variation of soil properties which is observed within the various vegetation units (rocky steppe savanna, sward, and steppe savannas on slope or on Dembo) should partially be attributed to differences of geochemical composition of rocks between sites but the main source of variability is to be found inside each hill. The soil contamination in Cu and Co originates from rock weathering and besides site effect and topographic distribution of the rocks, the variability of soil properties within one vegetation unit may be due to variability of soil parent material and not only to erosion. The second question dealt with the changes of soil properties at small distances. Metric variation was studied from transects between adjacent vegetation units. Our results showed that the abrupt changes of vegetation units which were clearly identified on the field were all truly explained by the variations of one or more properties linked to lithology. The key point being the Cu bioavailability. [less ▲]

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See detailLes toitures végétales extensives comme habitats analogues des pelouses sèches
Mêeus, Sophie ULiege; Boisson, Sylvain ULiege; Mahy, Grégory ULiege

Conference (2019, April 26)

De manière structurelle, les toitures végétalisées extensives ressemblent à certains habitats d'intérêt biologique majeur des milieux tempérés comme les pelouses xéro- ou mésophiles. Partant de l ... [more ▼]

De manière structurelle, les toitures végétalisées extensives ressemblent à certains habitats d'intérêt biologique majeur des milieux tempérés comme les pelouses xéro- ou mésophiles. Partant de l'hypothèse que les groupes fonctionnels correspondent à des conditions bien définies des habitats naturels, cette étude a testé l'effet de la profondeur du substrat sur la dynamique d'installation et la composition des groupes fonctionnels d'un mélange d'espèces de pelouses méso- et xérophiles. [less ▲]

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See detailSynthèse des inventaires biologiques des 24 carrières du Life in Quarries
Seleck, Maxime ULiege; Mathelart, Charlotte; Gauquie, Benoit et al

Report (2019)

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See detailComparison of mining spoils to determine the best substrate for rehabilitating limestone quarries by favoring native grassland species over invasive plants
Pitz, Carline ULiege; Mahy, Grégory ULiege; Harzé, Mélanie et al

in Ecological Engineering (2019), 127

Habitats being restored in Belgian quarries are easily invaded by non-native plant species, which can hamper the germination and development of vegetation deemed to be of high conservation value ... [more ▼]

Habitats being restored in Belgian quarries are easily invaded by non-native plant species, which can hamper the germination and development of vegetation deemed to be of high conservation value. Substrates of terraces created when mining limestone quarries could be inhospitable to native plants. However, they can provide opportunities for establishing specific vegetation, such as dry calcareous grasslands. Applying suitable mining spoils could be a cost-effective way to provide growing substrate when restoring limestone terraces. We assessed the efficacy of using mining spoils, collected on-site, as a potential growing substrate (bedding material). We tested gravely limestone (product of on-site mining activities), limestone dust (by-product), and no addition (bare limestone bedrock) to determine which was best for favoring the growth of native, dry calcareous grassland species and discourage the growth of two non-native invasive species that commonly invade altered mining sites: Buddleja davidii Franch and Senecio inaequidens DC. In a field experiment (in two quarries), we studied short-term (2 y) growth response of native and invasive species after sowing three seed mixtures of native grassland species, varying in functional diversity (and one no-sowing control treatment), all treatments subjected to competitive pressure exerted by invasive species. Percent cover of native and invasive species, species abundance and reproductive characteristics of the invasive species were monitored during 2-y. Native grasslands coverage was low on all substrate types, demonstrating how slowly calcareous grasslands species establish in such harsh substrate conditions. However, type of substrate did show a significant relationship with plant abundance, with limestone dust being the most beneficial for native species establishment (coverage). Although limestone dust appeared to be the best option for restoring grassland species to limestone quarries (based on its low cost, wide availability, and potential to support native species), it was also likely to support the two invasive species. Functional diversity of the seed mixture had no consistent effect. Our study shows the importance of identifying the most appropriate substrate to both establish calcareous grasslands and resist invasive species. This approach provides insights into developing strategies to conserve biodiversity in industrial and agricultural landscapes with limestone quarries. [less ▲]

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See detailMobility of copper and cobalt in metalliferous ecosystems: Results of a lysimeter study in the Lubumbashi Region (Democratic Republic of Congo)
Kaya Muyumba, Donato ULiege; Pourret, Olivier; Liénard, Amandine ULiege et al

in Journal of Geochemical Exploration (2019), 196

This paper presents the results of a lysimeter experiment in which a forest soil has been artificially spiked with rock fragments from natural copper (Cu) and cobalt (Co)-hills from Tenke-Fungurume ... [more ▼]

This paper presents the results of a lysimeter experiment in which a forest soil has been artificially spiked with rock fragments from natural copper (Cu) and cobalt (Co)-hills from Tenke-Fungurume (Democratic Republic of Congo). The Cu and Co contents of the percolating water have been analysed at repeated intervals and the impact of rock on the soil properties was evaluated at the end of the experiment. Five rocks were sampled in one copper hill. In natural conditions, these rock fragments located on the top of the hill are mixed to surface soil horizon along the slope through colluvial processes. The Cu and Co contents in rocks range respectively between 470 mg/kg (siliceous rock) and 140,000 mg/kg (shale) and between 450 mg/kg (dolostone) and 5,300 mg/kg (shale). Rock fragments were mixed with two horizons (hemi-organic A with 2.7% total organic carbon (TOC), and mineral B with 0.3% TOC) of an acid (pH water < 4.5) acrisol under forest. The mixture was placed in 1 L lysimeters and left in Lubumbashi ex situ conditions during the rainy season. Percolating water was collected for six periods after and the Cu and Co contents have been analysed. At the end of the experiment, soil from the lysimeter was removed for pH, TOC, available nutrients and trace elements, CaCl2-extractable Cu and Co analysis. The results show great differences between Cu and Co releases in the percolating solutions according to the nature of the rocks. The quantities released were correlated to the concentrations originally present in the unweathered rocks. Differences were also found between the A and B horizons, which indicate that the physicochemical properties of the soil influence reaction with the rocks. The differences between both horizons are mainly organic carbon content, cationic exchange capacity and nutrient content, which were higher in the A horizon. However, the pH of the A horizon was acidic compared with the B horizon. Significant correlations were found between extractable Cu and Co with concentrations of their leaching solution. Because of this, soluble Cu and Co extracted by CaCl2 can be regarded as vertical transfer risk prediction tools of Cu and Co in the soil. [less ▲]

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See detailInterLIFE - 09/10/2018
Mercken, Kathleen ULiege; Sneessens, Alexandre; Maebe, Laura ULiege et al

Conference given outside the academic context (2018)

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See detailThe role of bees in interaction networks with plants as a conservation argument
Jacquemin, Floriane ULiege; Violle, Cyrille; Munoz, François et al

Conference (2018, September 18)

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See detailThe invasive potential of introduced exotic trees: what do arboreta tell us ?
Fanal, Aurore ULiege; Mahy, Grégory ULiege; Monty, Arnaud ULiege

Poster (2018, September 05)

An increasing number of woody species are being listed as invasive in Europe. Forestry is the second largest pathway of invasive tree introductions and it is likely that climate change will encourage ... [more ▼]

An increasing number of woody species are being listed as invasive in Europe. Forestry is the second largest pathway of invasive tree introductions and it is likely that climate change will encourage forest managers to plant exotic tree species to maintain wood production. In the early 1900’s, several arboreta were established in Southern Belgium to assess the wood production potential of prospective exotic trees. However, they also offer the unique opportunity to assess the potential invasiveness of exotic tree species. A systematic sampling method was used to conduct surveys in eight arboreta and a buffer zone surrounding them. Regeneration of all exotic trees was recorded as well as biotic (herbaceous competition, composition of the tree stand) and environmental variables (soil type, pH, thickness of litter, canopy closure and climate). A descriptive approach allowed as to identify species showing an abundant regeneration. Linear regressions were implemented to assess whether the patterns in the regeneration of these exotic trees could be explained by their functional traits, dispersal modes, and environmental tolerances. Results revealed that several coniferous species from the North-American West coast exhibit rapid regeneration and/or dispersal, including Tsuga heterophylla, Abies grandis, Chamaecyparis lawsoniana, Pseudotsuga menziesii and Thuya plicata. We therefore recommend to exercise caution when planting these species in future forestry trials given their potentially invasive characteristics. [less ▲]

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See detailManaging invasive plants in quarry sites - Patterns, issues and opportunities
Monty, Arnaud ULiege; ortmans, William; Mahy, Grégory ULiege

Poster (2018, September)

Description of the subject. Vegetation of high conservation value can establish in quarries, during or after exploitation. Alien plants could hamper this process and represent additional rehabilitation ... [more ▼]

Description of the subject. Vegetation of high conservation value can establish in quarries, during or after exploitation. Alien plants could hamper this process and represent additional rehabilitation costs. The situation of plant invasion in quarries is unknown. Objectives. The aims were to assess alien plant invasion in active and abandoned quarries, and to identify the most invaded sectors. Method. We surveyed 6 692 plots in 31 quarries in Belgium and recorded occurrence, density and cover of the 65 listed alien plants in Belgium. Results. 14 species were recorded, and 25 quarries contained at least one species. The two most occurring species, Buddleja davidii Franch.and Senecio inaequidens DC., were more widespread in quarries in activity. All sectors of the quarries were concerned by invasion. Conclusion. Alien plant invasion in limestone quarries is highly variable, but significant. Considering the ecological potential of quarry sites, the issue should be better tackled. [less ▲]

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See detailLife In Quarries Project - Biological inventories - Biodiversity management implications
Seleck, Maxime ULiege; Taymans, Julien; Mathelart, Charlotte et al

Scientific conference (2018, May 03)

Throughout the life of quarries, a large diversity of temporary habitats is generated, sometimes left to evolve to more permanent ones. In urbanized and controlled landscapes, quarries are an exceptional ... [more ▼]

Throughout the life of quarries, a large diversity of temporary habitats is generated, sometimes left to evolve to more permanent ones. In urbanized and controlled landscapes, quarries are an exceptional opportunity to maintain rare and threatened transient habitats hosting fugitive species. While the extractive industry is willing to understand and manage sites’ biodiversity, lack of knowledge on the true biodiversity potential can jeopardize fugitive biodiversity installation successes and prevents an optimal restoration of ecosystem services in the post exploitation phase. A partnership build between FEDIEX, coordinating the project for Walloon quarries, University of Liège, Natagora (NGO) and Plaines de l'Escaut Nature Park allows the private and public sector to work hand in hand in the LIFE In Quarries (LiQ - LIFE14 NAT/BE/000364) in order to develop nature during the exploitation phase. Preliminary actions include the realization of initial inventories of quarries’ biodiversity in order to develop site based biodiversity management plans. 14 sites of a 1st project phase were inventoried in 2016. Habitats cartography following the WalEunis typology was realized along with standardized inventories for 5 biological groups relevant to the LiQ actions: Flora, Amphibians, Reptiles, Odonata and Birds. With occurrences of: • 82 species of the patrimonial flora; • 12 out of 13 species of Walloon Amphibians; • Six out of seven species of Walloon Reptiles; • 32 out of 64 species of dragonflies and damselflies; • 101 species of breeding birds; our inventories confirm the importance of quarries for targeted groups. We will herein further present results of quarries’ inventories as well as implications for the management of biodiversity. We will also present the process and resulting objectives of management plans concerted along with quarry operators. These management plans forecasted to be implemented between 2017 and 2019 we will finally illustrate the main project actions through concrete conservation actions realized on sites. [less ▲]

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See detailMining and biodiversity: Exploring the conservation strategy of a metallicolous vegetation in the Katangan Copperbelt (D.R.C.)
Boisson, Sylvain ULiege; Handjila Minengo, Guylain ULiege; Ngoy Shutcha, Mylor et al

Conference (2018, May 03)

Integration of economic activities with environmental integrity and social concerns is the greatest contemporary challenge, especially in case of mining activities. Southeastern of the Democratic Republic ... [more ▼]

Integration of economic activities with environmental integrity and social concerns is the greatest contemporary challenge, especially in case of mining activities. Southeastern of the Democratic Republic of Congo and adjoining regions in the North of Zambia, called the “Copperbelt”, comprise hundreds of Copper-Cobalt outcrops. This region hosts unique vegetation composed of metal tolerant and/or rare and endemic taxa. Most Cu-Co outcrops have now been allocated to mining companies and are expected to be impacted in the coming decades. Mining industries are adding environmental and social concerns in the mining plan, implying reflection ensuring a long term success. New concrete actions have been developed for the conservation and restoration of metallicolous plant communities before, during and after the extraction phase. Actions include in-situ conservation and ex-situ conservation methods through the storage of the most threatened species using species translocation, direct seeding, topsoil and community translocation and seed bank conservation for species having high priority. Also, innovative approaches have been exploring in order use metallicolous plants with high conservation value in site rehabilitation. This presentation will review ten years of challenges and actions, from the first scientific study of the ecosystem to the establishment of concrete strategies to temporarily store, restore an valorize this peculiar part of biological diversity. [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 detailDes toitures vertes analogues pour soutenir la biodiversité
Boisson, Sylvain ULiege; Monty, Arnaud ULiege; Mahy, Grégory ULiege

Article for general public (2018)

Imaginez-vous au beau milieu d’une prairie fleurie aux couleurs variées surplombant les toits d’une grande ville. Et si la ville pouvait réellement contribuer au maillage écologique ? Accueillir des ... [more ▼]

Imaginez-vous au beau milieu d’une prairie fleurie aux couleurs variées surplombant les toits d’une grande ville. Et si la ville pouvait réellement contribuer au maillage écologique ? Accueillir des espèces indigènes voire recréer des habitats d’intérêt conservatoire serait incontestablement une opportunité pour la biodiversité. Avec l’investissement dans le Centre de Recherche Terra, la faculté Gembloux Agro-Bio Tech, Liège Université, s’est lancé le défi d’innover dans le domaine des toitures végétales grâce à l’équipe de l’Unité Biodiversité et Paysage. Près de 450 m² de parcelles sont destinés à mettre en avant les habitats naturels en se basant sur le concept d’« habitats analogues », concept émergeant en écologie urbaine. [less ▲]

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See detailLa place de l'arbre dans les systèmes agricoles par les populations locales
Hick, Aurélie ULiege; Hallin, Maud ULiege; Tshibungu, Alain et al

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

Dans un contexte de déforestation massive dans les zones rurales adjacentes aux grandes métropoles de la République Démocratique du Congo (RDC), zones d’approvisionnement en bois-énergie, l’identification ... [more ▼]

Dans un contexte de déforestation massive dans les zones rurales adjacentes aux grandes métropoles de la République Démocratique du Congo (RDC), zones d’approvisionnement en bois-énergie, l’identification de la place et du rôle que prend l’arbre dans les villages constituent un préalable à tous plan de restauration forestière. Ce chapitre porte sur les connaissances taxonomiques, les usages et la distribution des espèces arborées indigènes au sein de quatre villages en zone rurale adjacente à la ville de Lubumbashi, chef-lieu de la province du Katanga en RDC. Un total de 49 espèces indigènes de la forêt claire a été identifié par les 51 familles interrogées. Les utilisations sont classées en 6 catégories. Neuf espèces sont connues par plus de 50% des familles et correspondent aux espèces les plus utilisées pour l’alimentation via la consommation de leurs fruits et pour la confection d’outils. Les espèces citées par les personnes interrogées ne sont pas présentes dans le système agricole. La densité d’arbre à l’hectare au sein des champs est faible. Les espèces présentes sont des espèces résistantes aux facteurs de dégradation. Cette étude a montré que la connaissance taxonomique est limitée aux espèces les plus utilisées. Il n’y a pas de gestion intégrée de l’arbre au sein du système agricole dans la zone rurale adjacente à la ville de Lubumbashi. [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 detailCopperflora Conservation Strategies: Species, strategies and phytostabilization
Boisson, Sylvain ULiege; Handjila Minengo, Guylain ULiege; Ngoy Shutcha, Mylor et al

Poster (2018, February 28)

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See detail2018 Copperflora Regional Workshop
Boisson, Sylvain ULiege; Handjila Minengo, Guylain ULiege; Mahy, Grégory ULiege

Conference given outside the academic context (2018)

Following the opening ceremony lead by TFM Environmental Manager Brian Ford, their Excellencies, the Ministers of Environment of Lualaba and Haut-Katanga, followed by his Excellency the Consul of Zambia ... [more ▼]

Following the opening ceremony lead by TFM Environmental Manager Brian Ford, their Excellencies, the Ministers of Environment of Lualaba and Haut-Katanga, followed by his Excellency the Consul of Zambia and his Excellency the Governor of the province of Lualaba, the professors of Gembloux Agro-Bio Tech (ULiège) introduced the challenges concerning the unique Copper Flora vegetation for both science and societal purposes. Sylvain Boisson, project engineer of the program, provided an overview of the strategy of conservation at within the concession and identified the primary objectives. Guylain Handjila, responsible for the TFM biodiversity program, then detailed the action structures, particularly the work of Stanko Muzala and Héritier Kabulo, ensuring, respectively, ecosystem reconstruction and nursery maintenance. The afternoon session was opened by the Rector Representative of the UNILU, Lucien Kimuni. Professors Wilfried Masengo and Mylor Ngoy Shutcha then described the benefit of a multidisciplinary project between the university and the various companies, particularly the opportunity for creating new scientific branches linked with the conservation of biodiversity. Sylvain Boisson concluded the presentation session with the valorization of vegetation within the reclamation strategy for polluted soils in the Copper belt. The challenges for studying biodiversity within the Copper belt was supported by professor Françoise Ilunga from the Université Nouveaux Horizons (Lubumbashi), who is starting a project focused on edible mushrooms. The first day of the workshop concluded with a short debate and discussion moderated by professor Grégory Mahy. The group discussed the benefit of regional awareness to conserve plant biodiversity within the Copper belt. Those in attendance appreciated this focus which is consistent with provincial objectives. The second day focused on a field visit within the TFM concession, presenting a sample of actions taken by the company towards the Copper Flora Conservation Program. A reconstructed ecosystem was visited, followed by the laboratory of biodiversity and the nursery in the Environmental Department of TFM. The closing ceremony of the workshop was made by Brian Ford and the provincial authorities who reaffirmed this positive initiative. [less ▲]

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See detailConcilier la conservation des métallophytes et la phytoremédiation des sols pollués par les éléments traces métalliques
Boisson, Sylvain ULiege; Ngoy Shutcha, Mylor; Mahy, Grégory ULiege

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

La conservation de la biodiversité est devenue un challenge social, politique et économique au niveau mondial. Etant donné que certaines régions du monde sont fortement soumises à l’anthropisation et à ... [more ▼]

La conservation de la biodiversité est devenue un challenge social, politique et économique au niveau mondial. Etant donné que certaines régions du monde sont fortement soumises à l’anthropisation et à ses impacts, il est indispensable de modifier notre perception et notre réflexion en ce qui concerne la conservation de la biodiversité et la restauration écologique. Ce chapitre explore les possibilités existantes et les adapte pour associer la conservation des espèces végétales d’intérêt avec la phytoremédiation des sols pollués. Cette nouvelle stratégie semble encourageante pour conserver le lien entre la société et l’environnement. En utilisant la diversité végétale locale, il est possible de créer de nouvelles communautés végétales afin de réhabiliter des sols pollués par les éléments traces métalliques. Le cas de la ville de Lubumbashi et de la flore de l’Arc Cuprifère Katangais en est un exemple marquant qui a été récemment testé avec succès. Cependant, d’autres études sur les métallophytes sont essentielles pour les utiliser de manière appropriée. [less ▲]

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See detailChapitre 10. Evaluation expérimentale de la phytodisponibilité du cuivre et du cobalt dans les sols des écosystèmes métallifères de l’Arc cuprifère katangais
Kaya Muyumba, Donato ULiege; Pourret, Olivier; Liénard, Amandine ULiege et al

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

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