ORBi Open Repository and Bibliography
In may 2007, the ULg's Administrative Board (joined in June 2007 by the FUSAGx) decided to create an institutional repository and defined a strong institutional self-archiving policy to increase the visibility, accessibility and impact of the University's publications (Board's decision).
This decision led to the official launch, in November 2008, of the ORBi platform including both the Academic Bibliography and the Institutional Repository of the Wallonia-Europe University Academy.
Pollution and Siltation of Rivers in the Western Highlands of Cameroon: a Consequence of Farmland Erosion by Runoff - Djoukeng, Henri Grisseur; Tankou, Christopher Mubeteneh; Degré, Aurore
In the western highlands agro-ecological zone of Cameroon, rivers are constantly silted and polluted with waste from cultivated plots. This study investigated on the characterization and quantification of sediment from plots cultivated in the watershed Méloh; among these sediment we highlighted soil, plant residues, chemical packages and plastic casing used for irrigation. In a natural rocky bottom wells, we performed for a period of three years the collection, differentiation and measurement of trapped sediment in the cultivated part of river that runs through the watershed. The total cultivated area is about 7.5 ha; slopes are operated between 14% and 17%....
IRGA GAS SAMPLING SYSTEM DIMENSIONING: LABORATORY AND FIELD EXPERIMENTS - De Ligne, Anne; Joly, Lilian; Cousin, Julien; Chauvin, Nicolas; Decarpenterie, Thomas; Aubinet, Marc
The gas sampling system (GSS), which carries air from the sampling point to the IRGA, is an essential component of the eddy covariance system. It has to meet several constraints, among which minimizing high frequency attenuation of concentration measurement and keeping pressure drop in the measurement cell in an acceptable range. Rain cup, filters, tubes and pumps are key elements of this system and need proper dimensioning.
The elaboration of the ICOS protocol for IRGA required such dimensioning and optimization.
Laboratory and field measurements were carried out with this aim.
In the laboratory, a dynamic calibration bench was developed to...
Seasonal and inter-annual variability of photosynthetic capacity in a temperate forest - Hurdebise, Quentin; Vincke, Caroline; Soubie, Rémy; De Ligne, Anne; Heinesch, Bernard; Aubinet, Marc
In temperate forests, the relation between vegetation phenology and carbon sequestration variability remains to be explored. To study phenology impact on CO2 fluxes, two photosynthetic
capacity indicators were used : NEE at light saturation (NEEsat) and green proportion in canopy pictures (gcc). Correlations between these indicators were investigated at seasonal and inter-annual scale.
MEASUREMENT OF CATTLE METHANE EMISSIONS USING THE EDDY-COVARIANCE TECHNIQUE - Dumortier, Pierre; Aubinet, Marc; Debacq, Alain; Gourlez de la Motte, Louis; Heinesch, Bernard
Methane emissions account for 8% of the EU-15 GHG emissions and livestock generates approximately half of these emissions . Recent technological advances in spectroscopy now permit methane flux measurement using eddy covariance. Methane fluxes exchanged by a pasture were measured continuously since June 2012 at the Dorinne Terrestrial Observatory in Belgium.
During grazing periods, fluxes are dominated by enteric fermentation. Methane emissions were found strongly related to cattle stocking rate. When fluxes are integrated over large periods and assuming a random position of cows on the pasture, emission per LSU (Livestock Unit) was found to be 53±3 kg CH4 year-1...
Stable isotope ratios reveal trophic niche partitioning among hermit crabs from tropical polyspecific seagrass meadows - Michel, Loïc; Frederich, Bruno; Lavitra, Thierry; Lepoint, Gilles
Polyspecific seagrass meadows are ubiquitous features of tropical coastal zones. These ecosystems are of critical ecological importance, and provide a wide range of socio-economical services to local populations. Meadows however undergo multiple threats linked to human activities (increased nutrient input, overfishing, invertebrate overharvesting, etc.). It is currently hard to assess how seagrass meadows could respond to anthropogenic impacts due to poor knowledge of their functional ecology. In an effort to unravel trophic interactions ruling the food webs associated to seagrass beds of the Toliara Great Reef (SW Madagascar), we studied resource segregation between two common Diogenidae hermit crabs (Dardanus scutellatus...
Les drones au secours de la grande faune menacée de RDC - Linchant, Julie; Lejeune, Philippe; Vermeulen, Cédric
Dans un contexte international de pressions de plus en plus intenses sur la faune sauvage, caractérisées notamment par une recrudescence intense du braconnage, le suivi régulier de la
faune est essentiel pour assurer sa conservation. La situation de la biodiversité en République
Démocratique du Congo est particulièrement préoccupante suite aux nombreux conflits
armés et aux pressions anthropiques qui en découlent, ainsi qu’au manque de moyens et
d’investissement. Habituellement, le suivi de la faune est réalisé à l’aide d’inventaires pédestres
et aériens. Cependant, ces méthodes font face à de nombreuses contraintes, notamment leur coût et la logistique importante qu’elles demandent. Elles sont aussi dangereuses pour les...