References of "Hambuckers, Alain"
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See detailResponse of the European ecosystems to climate change: a modelling approach for the 21st century
Dury, Marie ULg; Warnant, Pierre; François, Louis ULg et al

Poster (2010, May)

According to projections, over the 21st century, significant climatic changes appear and will be strengthened all over the world with the continuing increase of the atmospheric CO2 level. Climate will be ... [more ▼]

According to projections, over the 21st century, significant climatic changes appear and will be strengthened all over the world with the continuing increase of the atmospheric CO2 level. Climate will be generally warmer with notably changes in the seasonality and in the precipitation regime. These changes will have major impacts on the environment and on the biodiversity of natural ecosystems. Geographic distribution of ecosystems may be modified since species will be driven to migrate towards more suitable areas (e. g., shifting of the arctic trees lines). The CARAIB dynamic vegetation model (Carbon Assimilation in the Biosphere) forced with 21st century climate scenarios of the IPCC (ARPEGE-Climat model) is used to illustrate and analyse the potential impacts of climate change on tree species distribution and productivity over Europe. Changes in hydrological budget (e. g., runoff) and fire effects on forests will also be shown. Transient runs (1975-2100) with a new dynamic module introduced in CARAIB are performed to follow the future evolutions. In the new module, the processes of species establishment, competition and mortality due to stresses and disturbances have been improved. Among others, increased atmospheric CO2 and warmer climate increase tree productivity while drier conditions decrease it. Regions with more severe droughts will also be affected by an increase of wildfire frequency, which may have large impacts on vegetation density and distribution. [less ▲]

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See detailProblem of applying sodium selenate to increase selenium concentrations in grassland plant in Southern Belgium
Hambuckers, Alain ULg; Dotreppe, Olivier ULg; Istasse, Louis ULg

in Communications in Soil Science & Plant Analysis (2010), 41

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See detailMeasuring home-range quality in the frugivorous gibbon (Hylobates lar)
Hambuckers, Alain ULg; Huynen, Marie-Claude ULg; Savini, Tommaso

Conference (2009)

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See detailNutrient digestibility of Mucuna (Mucuna pruriens var. utilis) bean in guinea fowl (Numida meleagris, L): Effects of heat treatment and levels of incorporation in diets.
Dahouda, M.; Toleba, S. S.; Youssao, A. K. I. et al

in British Poultry Science (2009), 50(5), 564-72

1. Mucuna pruriens var. utilis is a legume, the seeds of which are scarcely used in animal diets owing to their high content of 3,4-dihydroxy-L-phenylalanine (L-Dopa). 2. Experiments were conducted on ... [more ▼]

1. Mucuna pruriens var. utilis is a legume, the seeds of which are scarcely used in animal diets owing to their high content of 3,4-dihydroxy-L-phenylalanine (L-Dopa). 2. Experiments were conducted on guinea fowl to assess the effects of two types of heat processing (cooking and toasting) on chemical composition and nutrient digestibility of Mucuna seeds offered alone or incorporated at three concentrations (40, 120 or 200 g/kg) in complete diets. 3. Diets containing 200 g/kg seeds had more crude fibre and less ether extract. L-Dopa content increased with the amount of Mucuna inclusion. Cooking reduced markedly L-Dopa content while toasting had no effect. When fed alone, Mucuna seeds dramatically decreased feed intake. 4. Feed intake (FI) and body weight gain (BWG) were not influenced by the complete diets. Cooking significantly increased crude fibre digestibility. 5. It is suggested that cracked and cooked Mucuna bean can be incorporated at a safe level of 120 g/kg in complete diets for guinea fowl production. [less ▲]

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See detailFood resources unconventional use for poultry production in Africa: nutritional values and constraints
Dahouda, M.; Toleba, S. S.; Senou, M. et al

in Annales de Médecine Vétérinaire (2009), 153(1), 5-21

Numerous works are related to the use of unconventional feed resources, and particularly to Mucuna Spp., in poultry diet. This review aims at describing the context of their use, their nutritional values ... [more ▼]

Numerous works are related to the use of unconventional feed resources, and particularly to Mucuna Spp., in poultry diet. This review aims at describing the context of their use, their nutritional values and the constraints related to their upgrading, before considering the effects of the various methods of treatment on the reduction of the toxic substances that they could contain and on their chemical compositions. The methods of treatment are very variable and their standardisation should allow using them in rural area. Those feed could thus constitute an alternative to costly conventional feed usually used in poultry production. [less ▲]

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See detailLes ressources alimentaires non-conventionnelles utilisables pour la production aviaire en Afrique : valeurs nutritionnelles et contraintes
Dahouda, M.; Toléba, S. S.; Sénou, M. et al

in Annales de Médecine Vétérinaire (2009), 153

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See detailThe effects of raw and processed Mucuna priurens seed based diets on the growth parameters and meat characteristics of Benin local Guinea fowl (Meleagris numida, L)
Dahouda, M.; Toleba, S. S.; Youssao, A. K. I. et al

in International Journal of Poultry Sciences (2009), 8(9), 882-889

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See detailSoil-applied selenium effects on tissue selenium concentrations in cultivated and adventitious grassland and pasture plant species
Hambuckers, Alain ULg; Dotreppe, Olivier ULg; Hornick, Jean-Luc ULg et al

in Communications in Soil Science & Plant Analysis (2008), 39(5-6), 800-811

According to international nutritional standards, plant selenium (Se) concentrations in Belgium are too low. To correct this situation, adding Se in fertilizers for pastures and grasslands is suggested ... [more ▼]

According to international nutritional standards, plant selenium (Se) concentrations in Belgium are too low. To correct this situation, adding Se in fertilizers for pastures and grasslands is suggested, similar to activities in Finland. However, there is a lack of data on meadow plant species' ability to absorb Se. Therefore, a pot experiment was initiated using 24 meadow plant species cultivated on a Belgian cambisol receiving standard fertilizer treatment, with or without the addition of 9 g Se ha(-1) yr(-1) as sodium selenate. Soil Se analysis confirmed the low Se status of the native soil. Mean foliar Se concentration in the control group was 0.05 mg kg(-1). Because plant deficiency may occur at levels less than 0.10 mg Se kg(-1), data provided further evidence for Se deficiency in Belgium plant production. When grown with Se, plant species showed wide variations for Se concentration, ranging from 0.08 to 0.49 mg Se kg(-1). All values were less than 2 mg Se kg(-1), the suggested threshold toxicity level for dairy cattle. There were two different types of plants in terms of response to Se fertilization. Most of the tested plants were known as nonaccumulators. There were also two probable secondary accumulators: Sinapis arvensis and Melilotus albus. Finally, one has to question the reliability of plant Se enhancement using this method when floristic composition is poorly controlled. [less ▲]

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See detailSeasonal variations in the crop contents of scavenging Helmeted Guinea Fowls (Numida meleagris, L.) in Parakou (Benin).
Dahouda, M.; Toléba, Seibou Soumanou; Youssao, A. K. I. et al

in British Poultry Science (2008), 49(6), 751-9

1. An experiment was carried out with 120 helmeted guinea fowls during one year in Parakou (Benin). Feed intake, ingredient and chemical composition, along with the nutritional adequacy of scavenging ... [more ▼]

1. An experiment was carried out with 120 helmeted guinea fowls during one year in Parakou (Benin). Feed intake, ingredient and chemical composition, along with the nutritional adequacy of scavenging diets were measured during the rainy season (November-February) and dry season (March-October) in order to propose supplementation strategies. Ingredients found in crops were identified and allocated into 6 main categories (supplemental feed, seeds, green forages, animal materials, mineral matter and unidentified materials). 2. Mean dry weights of crop contents were significantly higher in the rainy than in the dry season. Amounts and proportions of supplemental feed and seeds were not significantly different between seasons, whereas those of green forage, animal materials and mineral matter were higher in rainy season. Supplemental feed, especially maize and sorghum, was the largest component of the crop content in both seasons. The most represented grass seeds were Panicum maximum (rainy season) and Rottboellia cochinchinensis (dry season). 3. Dietary concentrations of organic matter, non-nitrogen extract and metabolisable energy were higher in the dry season, while mineral concentrations were higher in the rainy season. There were no significant differences between the two seasons in dry matter, crude protein or crude fibre. 4. Scavenging provided insufficient nutrients and energy to allow guinea fowls to be productive. Therefore, more nutritionally balanced supplementary feed would be required during both seasons. [less ▲]

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See detailBiodiversité
Hambuckers, Alain ULg

in Marbaix, P.; van Ypersele, J.-P. (Eds.) Imapcts des changements climatiques en Belgique (2004)

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See detailBiodiversiteit
Hambuckers, Alain ULg

in Marbaix, P.; van Ypersele, J.-P. (Eds.) Impacts van de klimaatveranderingen in België (2004)

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See detailProduction of selenium-enriched grass and haylage by mineral fertilisation in southern Belgium
de Behr, V.; Coenen, M.; Hambuckers, Alain ULg et al

in Proceedings of 7th Conference of the European Society of Veterinary and Comparative Nutrition (2003)

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See detailWatershed Liming in the Belgian Ardennes : Effects on soil solution and streamwater chemistry
Carnol, Monique ULg; Hambuckers, Alain ULg; Remacle, Jean ULg

Conference (1997, June)

Forest liming has received increased attention in the 1980s, when unusual needle yellowing and fall were observed in large parts of Europe and North America. This ‘new forest decline’ has been attributed ... [more ▼]

Forest liming has received increased attention in the 1980s, when unusual needle yellowing and fall were observed in large parts of Europe and North America. This ‘new forest decline’ has been attributed to several causes acting individually or synergetically, amongst which were acidification, N saturation and nutritional imbalances. This time, liming did not aim at increased productivity, but as a counteracting measure to the soil acidification and to remove nutritional imbalances. The Belgian Ardennes were not exempt from this phenomena and symptoms of forest dieback were reported in 1983 by Weissen (Weissen et al.,1983). Soils are naturally poor in magnesium and the observed dieback was supposed to be the consequence of increased pollution exacerbating the deficiency in magnesium. A reduction in productivity and financial losses were predicted. Liming was suggested for prevention and correction, however possible side effects, in particular on soil solution (tree nutrition) and stream water chemistry (drinking water) needed to be evaluated. In this paper, we present results from a case study in four Picea abies watersheds in southern Belgium. The paired watersheds of approximately 80 ha were situated in the ‘Haute Ardenne’ and in the ‘Ardenne occidentale’ regions, on acid brown soils. One watershed of each pair was limed with 3 T/ha of fine ground dolomite ((Ca,Mg)CO3) 55/40 and 200 kg/ha K2SO4 in 1992 and 1993, respectively. Rainfall, throughfall and monolith lysimeter soil solution were analysed at monthly intervals, and runoff chemistry at two-weekly intervals (volume-weighed reconstructed daily samples). Time series intervention analysis was used as a tool to detect statistically significant changes in stream water chemistry due to the liming event, and fluxes were calculated to evaluate losses of the applied dolomitic lime to the catchment stream. Dolomite dissolution distinctively affected streamwater chemistry in the watershed situated in the Hautes Ardennes (Waroneu). Magnesium concentrations increased immediately after liming, most likely due to surface runoff. Four years after liming, concentrations were still higher than prior to liming. However, the proportions of magnesium lost were relatively low compared to the dose applied. Calcium concentrations did not change after liming in either catchment, nor did the concentrations of the major cations and anions measured. In the monolith lysimeters, magnesium concentrations increased immediately after liming under the organic horizons, and one year after liming under the mineral horizons. Calcium concentrations increased only three years after the application of lime under the organic and mineral horizons. These results led to the conclusions that for the soils under study and the doses applied, a major part of the lime was retained by the soil system, and that consequences on water chemistry were minor. [less ▲]

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See detailIS THE PRESENCE OF MESOTROPHIC PLANT-COMMUNITIES IN THE PEAT-BOGS OF HAUTES-FAGNES (BELGIUM) CONNECTED WITH TONALITE INTRUSIONS IN THE REVINIAN LAYERS
Hambuckers, Alain ULg; Schumacker, René ULg; Remacle, Jean ULg et al

in Belgian Journal of Botany (1995), 128(1), 48-56

Within the Hautes-Fagnes Nature Reserve (Belgium) acidic and oligotrophic biotopes are developing on very acidified stony silt raised bogs. However, they are locally dominated by mesotrophic species ... [more ▼]

Within the Hautes-Fagnes Nature Reserve (Belgium) acidic and oligotrophic biotopes are developing on very acidified stony silt raised bogs. However, they are locally dominated by mesotrophic species. Based on the fact that there are several outcrops of tonalite in the region and particularly one in the Nature Reserve, a hypothesis to explain these singularities of the vegetation implies discontinuities of the bedrock provoked by intrusions of this magmatic rock in the Revinian layer covering the region. Seventeen plots containing Phragmites australis were examined and vegetation was described. Silt and soil water were sampled and analyzed for mineral contents in 15 sites. The differences of mineral composition between the P. australis plots and their surrounding environment confirmed the more mesotrophic characteristics of these plots (i.e. higher pH, higher Ca and Mg contents, lower Al content). However, the lower Zn, Pb and Fe contents would lead to reject the hypothesis of intrusions of tonalite since these elements are more abundant in the tonalite and its mineralization than in the Revinian rock. Nevertheless, the overall ecological conditions of the examined plots and the differences of plant species composition suggested that the observed chemical environment could be evoked for explaining the distribution of the mesotrophic species in the oligotrophic environment of the Nature Reserve. Consequently, an alternative hypothesis is proposed. [less ▲]

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See detailRELATIVE IMPORTANCE OF FACTORS CONTROLLING THE LEACHING AND UPTAKE OF INORGANIC-IONS IN THE CANOPY OF A SPRUCE FOREST
Hambuckers, Alain ULg; Remacle, Jean ULg

in Biogeochemistry (1993), 23(2), 99-117

Sequential sampling of precipitation under mature spruce trees and time-series analysis of the data were performed in order to assess, in natural conditions, the relative importance of different factors ... [more ▼]

Sequential sampling of precipitation under mature spruce trees and time-series analysis of the data were performed in order to assess, in natural conditions, the relative importance of different factors that could influence the leaching and uptake of inorganic ions in the canopy. Eleven rain events were analyzed in order to estimate how external factors, rain intensity, H+, and ionic concentration of the incident rain influence the ionic throughfall concentrations and the net throughfall fluxes. The results led to the conclusion that leaching or uptake mostly occur by diffusion. The influence of the open rain acidity was not conclusive; however, it was shown that the tested external factors only controlled a few percent of the variation of the data. By contrast, the autocorrelation of the data always explained a large portion of the variance. lt could result from the gradual changes in the course time of internal factors related to the exchange system including waxes, cuticles, apoplast and xylem sap. These constituents were known to control the exchange at the canopy surface and to be sensitive to the plant physiology and environmental conditions. [less ▲]

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See detailNUTRITIONAL-STATUS OF DECLINING SPRUCE (PICEA-ABIES (L) KARST) - EFFECT OF SOIL ORGANIC-MATTER TURNOVER RATE
Hambuckers, Alain ULg; Remacle, Jean ULg

in Water, Air & Soil Pollution (1991), 59(1-2), 95-106

Foliar analysis was undertaken in two plots of Picea abies (L.) Karst., located in a watershed of Haute Ardenne, Belgium, in order to estimate the decline of the trees. Apart from a general Mg deficiency ... [more ▼]

Foliar analysis was undertaken in two plots of Picea abies (L.) Karst., located in a watershed of Haute Ardenne, Belgium, in order to estimate the decline of the trees. Apart from a general Mg deficiency, the concentrations of the needles were in the same range as those determined in other European stands. Comparisons between healthy and declining trees within each plot revealed a general pattern of decline similar to that observed elsewhere in Western Europe. This was shown as lower Ca, Mg, Zn concentrations and water content and higher N and P concentrations of the needles collected from declining trees. It is concluded that this decline could be due to N over fertilization by the atmospheric deposition. The difference of decline between the two plots was attributed to the turnover rate of the soil organic layer which was less intensive in the most damaged plot. [less ▲]

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See detailA Decennial Control Of N-Cycle In The Belgian Ardenne Forest Ecosystems
Weissen, F.; Hambuckers, Alain ULg; Vanpraag, Hj. et al

in Plant and Soil (1990), 128(1),

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