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See detailÉVOLUTION DE LA TENEUR EN EAU LE LONG D’UNE TOPOSEQUENCE FORESTIERE ARGILO-LIMONEUSE
Deraedt, Deborah ULiege; Colinet, Gilles ULiege; Degré, Aurore ULiege

in Milieux Poreux et Transferts Hydriques (in press)

For the hydrological modeling of forested watersheds, the understanding of the forest hydrodynamic is essential. This study focusses on the hydrology of a Belgian forested plot with high stoniness and ... [more ▼]

For the hydrological modeling of forested watersheds, the understanding of the forest hydrodynamic is essential. This study focusses on the hydrology of a Belgian forested plot with high stoniness and steep slope. The soil water content is monitored at several positions on the toposequence and at different depth. During rain events, peak in soil water content are observed in different depth depending on the position along the toposequence. [less ▲]

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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 detailSANISOL, un outil pilote de recommandations aux producteurs de légumes et de fruits sur sol contaminé en Wallonie (Belgique)
Liénard, Amandine ULiege; Fontenoy, Delphine; Pereira, Benoît et al

Conference (2019, March 26)

Objectif Le projet SANISOL, à travers la mise en œuvre d’un outil informatique pilote sur Internet, vise à fournir des recommandations particulières de gestion et d’utilisation à tout producteur de ... [more ▼]

Objectif Le projet SANISOL, à travers la mise en œuvre d’un outil informatique pilote sur Internet, vise à fournir des recommandations particulières de gestion et d’utilisation à tout producteur de biomasse alimentaire (notamment légumes et fruits) sur sols contaminés en Wallonie. Caractère innovant du sujet proposé L’originalité de cette étude repose sur le caractère multidisciplinaire et multi-acteurs de l’approche. Elle mobilise des compétences en matière d’échantillonnage et d’analyses de sols, de légumes et de fruits ainsi qu’un biomonitoring avec prélèvements d’échantillons biologiques (cheveux, sang, urine), le tout en concertation avec les acteurs régionaux et locaux. Les objectifs poursuivis étant de livrer des recommandations adaptées à la production potagère et à la fréquentation des potagers pour les personnes réalisant une activité de jardinage en vue d’une autoconsommation sur sol contaminé. En outre, elle rassemble des acteurs d’horizons différents : des scientifiques (Université de Liège et Université Catholique de Louvain), des organismes d’intérêt public (SPAQuE, ISSeP, Espace Environnement), le secteur associatif et les pouvoirs publics. Résumé Le projet SANISOL s’articule autour de cinq volets : l’étude des transferts sols-plantes en métaux en jardins potagers, le diagnostic du modèle S-Risk© pour la production végétale, un programme d’action Environnement-Santé à l’aide d’un biomonitoring, la configuration d’un outil informatique pilote et une gestion de la communication avec production d’un contenu « Sols potagers pollués » diffusable au grand public. L’association de ses différentes approches permettra la détermination de teneurs limites en polluants dans le sol en vue d’assurer la qualité commerciale des productions végétales en Wallonie et la gestion des risques pour les producteurs et les jardiniers. En effet, la pratique du jardinage est en recrudescence et elle démontre plusieurs bienfaits physiques, sociaux, psychiques, etc. Cependant, l’autoproduction en jardins collectifs ou privatifs se heurte aux interrogations grandissantes quant aux risques sanitaires liés à la pollution en métaux (arsenic, cadmium, mercure, plomb, zinc, etc.) relevée dans certains sols en Wallonie (provenant des activités industrielles historiques ou du fond pédogéochimique naturel). Au terme du projet, un outil informatique disponible sur Internet, sera capable d’émettre des recommandations sur les productions végétales réalisées sur une parcelle qui aurait fait l’objet d’une analyse de sol, voire de légumes (Figure 1). Par le biais d’un questionnaire, l’utilisateur fournit diverses informations telles que : les concentrations en métaux dans le sol ainsi que le type de légumes ou fruits autoproduits, ses habitudes alimentaires, la fréquentation du jardin potager, etc. Sur base de ces données, un modèle d’évaluation des risques construit à partir d’équations de transfert sols-plantes, de valeurs toxicologiques de références, de valeurs de bioaccessibilité spécifiques à chaque métal générera des recommandations en matière de production végétale et de gestion à la parcelle. [less ▲]

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See detailInvestigating the effect of plants on PAHs dissipation and bioaccessibility in brownfield contaminated soils (3 and 6 months cultures).
Davin, Marie ULiege; Fauconnier, Marie-Laure ULiege; Colinet, Gilles ULiege et al

Scientific conference (2019, February 04)

Polycyclic aromatic hydrocarbons (PAHs) are a class of persistant organic compounds of major concern that tend to accumulate in the environment, damaging ecosystems and health. Brownfields represent an ... [more ▼]

Polycyclic aromatic hydrocarbons (PAHs) are a class of persistant organic compounds of major concern that tend to accumulate in the environment, damaging ecosystems and health. Brownfields represent an important tank for PAHs and require remediation. As an alternative to environmentally aggressive, expensive and often disruptive soil remediation strategies, experiences have been carried on to understand and develop techniques based on bioremediation and phytoremediation. The main objective of the study was to investigate the potential of plants (Medicago sativa L. or Trifolium pratense L.) as PAHs bioremediation enhancers on an aged-contaminated soil. The first step was to adapt a bioaccessibility measurement protocol, using Tenax® beads, to the studied contaminated soil. Meanwhile soil samples were cultured in pots with one of the plant species for three, six, nine, and twelve months and compared to unplanted soil samples. Each modality was repeated five times for a total of 60 samples. PAHs desorption kinetics were established for 15 PAHs and described by a site distribution model. A common Tenax® beads extraction time (24 h) was established as a comparison basis for PAHs bioaccessibility assessments. Bioaccessible and residual PAHs were quantified using High-Performance Liquid Chromatography with Fluorimetric Detection (HPLC-FLD) on the three and six months samples, as the experiment is still underway. Preliminary results will be discussed. [less ▲]

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See detailSpecies diversity of Arabis alpina L. communities in two Pb/Zn mining areas with different smelting history in Yunnan Province, China
Li, Zuran; Colinet, Gilles ULiege; Zu, Yanqun et al

in Chemosphere (2019), 233

In order to explore the species compositions and species diversity (Dominance (Do), Shannon-Wiener index (H0), Simpson diversity index (Dsi), Species richness (DMG), Pielou evenness index (Epi) and Fre ... [more ▼]

In order to explore the species compositions and species diversity (Dominance (Do), Shannon-Wiener index (H0), Simpson diversity index (Dsi), Species richness (DMG), Pielou evenness index (Epi) and Fre- quency (Fr)) of twenty Arabis alpina L. var. parviflora Franch communities, field investigation was con- ducted in Huize county, Yunnan province, China. Some 20 A. alpina communities were distributed in two traditional smelting tailing piles of Minbingyingjiying (TST) and Shangduoduo village (SDD) with different Pb smelting history. The morphological characteristics (plant height, branch number, basal leaf length, basal leaf width and root morphology) of A. alpina, contents and accumulation characteristics of eight potentially toxic metals (As, Cd, Cr, Cu, Pb, Zn, Al, Fe) in soil and plants were analyzed. The results showed that the morphological characteristics of A. alpina were mean plant height 12.25 cm, the basal leaf length 17.69 cm, leaf width 5.40 cm, the total root length 117.86 cm plant 1, the root diameter 0.90 mm. The leaves of A. alpina in SDD were longer and narrower with higher plant height compared with in TST. The main companion plants of A. alpina were Sporobolus fertilis (Steud.) W. D. Clayt, Arenaria orbiculata Royle ex Edgew. et Hook. F. and Eulalia speciosa. (Debeaux). The H0 and Dsi were 0.56e2.04 and 0.44e0.95, respectively. The plant species numbers, H’, Dsi and Epi of A. alpina communities in TST were higher than those in SDD. Pb contents in shoot of two A. alpina samples were more than 1000 mg kg 1, Cd content in shoot of one A. alpina sample >100 mg kg 1 and Zn contents in shoot of seven A. alpina samples >10,000 mg kg 1 with the enrichment factors and transport coefficients greater than 1. The results indicate that A. alpina as a Zn, Pb and Cd hyperaccumulator, could be used for long-term phy- toremediation of soils contaminated by Cd, Pb and Zn. Species diversity of A. alpina community during long-term natural vegetation restoration was high in the middle succession with single-peak model, and A. alpina would be dominant in the succession climax stage in potentially toxic metal contamination areas. [less ▲]

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See detailInfluence of edaphic conditions and nitrogen fertilizers on cadmium and zinc phytoextraction efficiency of Noccaea caerulescens
Jacobs, Arnaud; Noret, N.; Van Baekel, A. et al

in Science of the Total Environment (2019), 665

The success of cadmium phytoextraction operations with Noccaea caerulescens varies by a factor of 70 between sites of trials. However, soil factors driving the efficiency of cadmium (Cd) and zinc (Zn ... [more ▼]

The success of cadmium phytoextraction operations with Noccaea caerulescens varies by a factor of 70 between sites of trials. However, soil factors driving the efficiency of cadmium (Cd) and zinc (Zn) phytoextraction are still poorly understood, as are the effects of nitrogen fertilizers. We studied biomass production and Cd and Zn uptake by two contrasting populations of N. caerulescens, Ganges (metallicolous) and Wilwerwiltz (non-metallicolous) grown in pots on a range of 24 field contaminated soils for 20 weeks. The addition of KNO 3 and NH 4 NO 3 fertilizers was also tested. Using model averaging of multiple regression models, we show that the major drivers of N. caerulescens growth are physical soil factors such as organic matter and soil bulk density while trace metal accumulation mainly relies on soil Cd and Zn exchangeable concentrations. We confirm the negative effect of soil copper (Cu) on growth, even at exchangeable concentrations below 30 mg kg −1 , and therefore on uptake efficiency, while increasing soil lead (Pb) content was related to increased biomass probably due to a protective effect against soil pathogens. Finally, there is a small positive effect of nitrogen fertilization on biomass production only in soils with low initial nitrogen content (under 25 μg g −1 NO 3 − ), while above this value, the positive impact of initial nitrogen content is offset by lower shoot Cd and Zn concentrations. Our data bring substantial information regarding the physico-chemical properties to ensure N. caerulescens growth: a soil bulk density under 1.05 kg/dm 3 , organic matter above 7% and pH under 7.5. We show that phytoextraction efficiency is maximal for moderate soil contamination in Cd (2–10 mg kg −1 ) and Zn (300–1000 mg kg −1 ). © 2019 Elsevier B.V. [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 detailTransfert des polluants du sol vers les plantes potagères
Liénard, Amandine ULiege; Colinet, Gilles ULiege

Conference given outside the academic context (2018)

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See detailEffects of Permaculture Practices on Soil Physicochemical Properties and Organic Matter Distribution in Aggregates: A Case Study of the Bec-Hellouin Farm (France)
de Tombeur, Félix ULiege; Sohy, Valentin ULiege; Chenu, Claire et al

in Frontiers in Environmental Science (2018), 6

The limitations of conventional agriculture have accelerated the need for a transition to an environmentally and economically sustainable agricultural model. In this regard, the role played by soil ... [more ▼]

The limitations of conventional agriculture have accelerated the need for a transition to an environmentally and economically sustainable agricultural model. In this regard, the role played by soil organic matter (SOM) is key. Here, we aimed to study the impact of permaculture and biointensive micro-gardening practices, characterized by intensive cultivation, the use of large and localized organic inputs and the non-use of mineral fertilizers and pesticides, on soil physicochemical properties and SOM distribution in aggregate-size fractions. The physicochemical properties of soils in permaculture farming implemented for 7 years were compared with a soil under pasture. A soil experiencing conventional agriculture practices in similar geopedoclimatic conditions was simultaneously studied. Soils were separated into four aggregate-size fractions, into which organic carbon (OC) concentrations have been measured. The major soil physicochemical properties were measured on the bulk soils. The concentrations of total OC and nitrogen (N) in bulk soils were higher under permaculture practices, due to significant inputs of manure and compost, resulting in higher concentrations of the bioavailable nutrients Ca, Mg, K, and P. The permaculture practices sustained a level of macroaggregation similar to that of the pasture, and well above that of conventional practices. OC concentrations increased in the 250–2,000, 50–250 μm and occluded 50–250 μm fractions, but not in the <50 μm fraction compared to pasture. This can be explained by the too short duration of permaculture practices for allowing the decomposition of coarse particulate organic matter (POM) into fine sized SOM that is more associated with mineral particles. The higher OC stocks in permaculture are therefore mainly governed by the coarse POM fraction. Our results show that permaculture/biointensive micro-gardening practices enhance SOM storage and modify the distribution of SOM in aggregate-size fractions, while substantially improving nutrient bioavailability and suggest that these practices strongly affect soil properties. The effects of permaculture practices on soil properties would certainly vary depending on geopedoclimatic context, justifying the need to implement the approach for other soil types. Finally, we recommend to compare biogeochemical budget and nutrients use efficiency of permaculture gardening with conventional horticulture gardening. [less ▲]

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See detailExploitation des données issues de la base de données centralisée et valorisation des données au sein du réseau REQUASUD. La qualité des sols
Mariage, Clémence ULiege; Renneson, Malorie; Colinet, Gilles ULiege

Scientific conference (2018, May 31)

Présentation de l'état de la base de données sol de REQUASUD et de son importance pour la gestion des sols wallons.

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See detailImpact of crop residue management on crop production and soil chemistry after seven years of crop rotation in temperate climate, loamy soils
Hiel, Marie-Pierre ULiege; Barbieux, Sophie; Pierreux, Jérome ULiege et al

in PeerJ (2018), 6(e4836),

Society is increasingly demanding a more sustainable management of agro-ecosystems in a context of climate change and an ever growing global population. The fate of crop residues is one of the important ... [more ▼]

Society is increasingly demanding a more sustainable management of agro-ecosystems in a context of climate change and an ever growing global population. The fate of crop residues is one of the important management aspects under debate, since it represents an unneglectable quantity of organic matter which can be kept in or removed from the agro-ecosystem. The topic of residue management is not new, but the need for global conclusion on the impact of crop residue management on the agro-ecosystem linked to local pedo-climatic conditions has become apparent with an increasing amount of studies showing a diversity of conclusions. This study specifically focusses on temperate climate and loamy soil using a seven-year data set. Between 2008 and 2016, we compared four contrasting residue management strategies differing in the amount of crop residues returned to the soil (incorporation vs. exportation of residues) and in the type of tillage (reduced tillage (10 cm depth) vs. conventional tillage (ploughing at 25 cm depth)) in a field experiment. We assessed the impact of the crop residue management on crop production (three crops—winter wheat, faba bean and maize—cultivated over six cropping seasons), soil organic carbon content, nitrate (NO−3), phosphorus (P) and potassium (K) soil content and uptake by the crops. The main differences came primarily from the tillage practice and less from the restitution or removal of residues. All years and crops combined, conventional tillage resulted in a yield advantage of 3.4% as compared to reduced tillage, which can be partly explained by a lower germination rate observed under reduced tillage, especially during drier years. On average, only small differences were observed for total organic carbon (TOC) content of the soil, but reduced tillage resulted in a very clear stratification of TOC and also of P and K content as compared to conventional tillage. We observed no effect of residue management on the NO−3 content, since the effect of fertilization dominated the effect of residue management. To confirm the results and enhance early tendencies, we believe that the experiment should be followed up in the future to observe whether more consistent changes in the whole agro-ecosystem functioning are present on the long term when managing residues with contrasted strategies. [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 detailEvaluation of sanitary risks versus benefits of gardening in urban areas : a case study in Belgium
Colinet, Gilles ULiege; Liénard, Amandine ULiege; Marloie, Marcel et al

Conference (2018, April 18)

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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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See detailEvaluation du développement végétatif du colza. Test d'un appareil à mesure optique.
Vandenberghe, Christophe ULiege; Bachelart, Florent ULiege; Grandclaudon, Maryline et al

Report (2018)

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