References of "Bock, Laurent"
     in
Bookmark and Share    
Peer Reviewed
See detailSuitability of the soil map and legacy data in Wallonia (Belgium) to support the GlobalSoilMap initiative
Legrain, Xavier ULg; Bock, Laurent ULg; Colinet, Gilles ULg

in Arrouays, Dominique; McKenzie, Neil; Hempel, Jon (Eds.) et al GlobalSoilMap - Basis of the global spatial soil information system (2013, October 07)

Belgium is covered with large-scale soil map and high density of historical profiles, now available in a numerical format. This papier first gives an overview of the soil properties which can be predicted ... [more ▼]

Belgium is covered with large-scale soil map and high density of historical profiles, now available in a numerical format. This papier first gives an overview of the soil properties which can be predicted from these documents, in combination with the legacy data, and of the uncertainty we can expect for now. The great potential of the soil map is highlighted, as well as its complexity. Example of the soil depth to rock points out the need of a thorough understanding of the soil map in order (i) to interpret correctly the information hidden behind each symbols or emerging from their combination and (ii) to take into account the sub-regional features. Expert knowledge seems essential, associated with historical and new hard data, in order to build a rich and confident map which respects the recommendations of the GlobalSoilMap.net project. [less ▲]

Detailed reference viewed: 10 (0 ULg)
Full Text
Peer Reviewed
See detailHow can long-term experimental plots can help us to understand the sustainability of different phosphorus inputs ?
Renneson, Malorie ULg; Dufey, Joseph; Roisin, Christian et al

Poster (2013, September)

Detailed reference viewed: 23 (5 ULg)
Full Text
See detailEstablishing Reference Systems on Soil Quality: Example of the “ReQuaSud” Laboratory Network in Wallonia – Belgium
Colinet, Gilles ULg; Renneson, Malorie ULg; Genot, Valérie ULg et al

Conference (2013, May 24)

Soil quality is a central concern regarding sustainable multifunctionnality of cultivated and natural territories : food and non-food biomass production, environmental and ecosystemic services… Quality ... [more ▼]

Soil quality is a central concern regarding sustainable multifunctionnality of cultivated and natural territories : food and non-food biomass production, environmental and ecosystemic services… Quality indicators and reference levels are needed in order to evaluate the state of the soil resources from a given land, for land-use planning or and to detect any temporal evolution. Our department has been involved for years in the implementation of substantial databases about soil quality in the Walloon region. The communication aims at sharing our experience in the establishment of soil evaluation references and tools, geographic databases, time monitoring, analysis networking, applied to the questions of soil fertility and soil contaminations. The Requasud network is a regional initiative aiming at harmonizing the methods for soil sampling, analysis, and interpretation. We will present how 20 years of applied research led to the sound implementation of a dataset of more than 200,000 samples in cultivated fields all across Wallonia, and where are the remaining questions and needs for future research. Discussions should then focus to comparisons with the situations encountered by the participants to the Workshop. [less ▲]

Detailed reference viewed: 25 (1 ULg)
Full Text
Peer Reviewed
See detailRelationships between the P status of surface and deep horizons of agricultural soils under various cropping systems and for different soil types: a case study in Belgium
Renneson, Malorie ULg; Dufey, J.; Legrain, Xavier ULg et al

in Soil Use and Management (2013), 29(S1), 103--113

Application of phosphorus (P) fertilizers to agricultural soils should be based on sound knowledge about soil P reserves, availability and lability to optimize conditions for plant uptake while limiting P ... [more ▼]

Application of phosphorus (P) fertilizers to agricultural soils should be based on sound knowledge about soil P reserves, availability and lability to optimize conditions for plant uptake while limiting P transport to surface waters. This study investigated relationships between parent material (PM), land use and P fractions in agricultural soils at a regional scale. Surface and deep (100–120 cm) soil samples were collected from 120 agricultural sites (240 total samples) and analysed for three P forms (inorganic, organic and available) as well as for additional key properties. Land uses within the study area were continuous cropland, permanent pasture and temporary grassland. The area covered the 12 most common parent types in Wallonia. Mean total P contents were 904 and 401 mg/kg in surface and deep samples, respectively, with a 33% coefficient of variation for both horizons. The organic P fraction represented, on average, 30% of total P, while available P corresponded to 9% of total P. The influence of PM was apparent in both the surface and deep soil samples, while land use influenced only surface properties. The pattern in total P content relative to land use was pasture ≥ cropland ≥ temporary grassland. Correlation analyses highlighted significant relationships between edaphic parameters viz Alox, Feox, CEC, TOC, pH and P content, the main soil parameter being Alox which determines P sorption capacity. An enrichment factor was used to distinguish between geogenic sources and human activities in terms of topsoil P content. [less ▲]

Detailed reference viewed: 43 (18 ULg)
Full Text
Peer Reviewed
See detailCartographie du risque d’érosion hydrique à l’échelle parcellaire en soutien à la politique agricole wallonne (Belgique)
Maugnard, Alexandre; Bielders, Charles; Bock, Laurent ULg et al

in Étude et Gestion des Sols (2013), 20(2), 127-141

L’érosion hydrique des sols pose le problème de la protection de la ressource « sol » mais également de la prévention des impacts environnementaux et sociétaux qui y sont associés tels que la dégradation ... [more ▼]

L’érosion hydrique des sols pose le problème de la protection de la ressource « sol » mais également de la prévention des impacts environnementaux et sociétaux qui y sont associés tels que la dégradation de la qualité des eaux de surface, l’envasement des retenues d’eau et des bassins d’orage ou encore les inondations boueuses. Afin de cibler au mieux les mesures de lutte anti-érosives, il convient d’identifier les parcelles agricoles les plus à risque d’érosion. Mettant à profit la disponibilité d’importantes bases de données en matière de climat, sol, topographie, parcellaire et occupation du sol, une procédure automatisée de calcul de l’aléa érosion hydrique potentielle à l’échelle parcellaire, adaptée du modèle RUSLE, a été mise au point pour la Wallonie (Belgique). La carte de l’aléa érosion potentielle montre une sensibilité maximale à l’érosion hydrique en Ardenne et Haute-ardenne, en raison du relief accentué et d’une érosivité plus importante des pluies. Pour les principales zones agro-pédologiques de Wallonie, un suivi des principales cultures (céréales d’hiver, mais, betterave, pomme de terre, colza, lin) a également été réalisé, permettant d’estimer le facteur cultural C des principales successions culturales et ainsi l’érosion effective. La prise en compte de l’occupation du sol fait cette fois ressortir un aléa maximal dans les régions (sablo-)limoneuses et le Condroz, en raison des superficies importantes de grandes cultures industrielles. En Ardenne et Haute Ardenne, l’aléa d’érosion effective est faible en raison d’une couverture végétale dominée par les prairies permanentes. Enfin, sur base de la carte numériques des sols de Wallonie, une classification de la vulnérabilité des sols à l’érosion a été établie à partir du volume de sol pouvant être exploité par les racines. La vulnérabilité apparaît élevée sur une majorité du territoire wallon, à l’exception des Régions (sablo-)limoneuses et de la Région jurassique. Un indice d’érosion, calculé comme le rapport de l’érosion potentielle (aléa) sur l’érosion tolérable (vulnérabilité) permet de calculer le risque d’érosion hydrique et, par conséquent, de cibler au mieux les parcelles pour lesquelles l’érosion constitue une menace majeure pour leur valorisation durable. Une gestion appropriée de ces parcelles par un choix judicieux en termes d’occupation du sol (forêt, prairie, rotations culturales) et de pratiques culturales (p.ex., TCSL, inter-cultures) devrait permettre d’y réduire les risques de dégradation des sols par érosion hydrique. [less ▲]

Detailed reference viewed: 37 (14 ULg)
Full Text
Peer Reviewed
See detailMobility and distribution of lead, cadmium, copper and zinc in soil profiles in the peri-urban market garden of Kunming, Yunnan Province, China
Zu, Yanqun; Bock, Laurent ULg; Schvartz, Christian et al

in Archives of Agronomy and Soil Science (2013)

Detailed reference viewed: 27 (3 ULg)
Full Text
Peer Reviewed
See detailOur soil map as cultural heritage: what of the Belgium soil survey project should be preserved and what is being lost?
Legrain, Xavier ULg; Dondeyne, Stefaan; Deckers, Jozef et al

Poster (2012, July 06)

Between 1947 and 1991, soils of Belgium were mapped to establish a systematic inventory of the country soil resources. Field observations were done by soil auger to a standard depth of 1.25 m and at a ... [more ▼]

Between 1947 and 1991, soils of Belgium were mapped to establish a systematic inventory of the country soil resources. Field observations were done by soil auger to a standard depth of 1.25 m and at a mean density of 2 points per hectare. Cadastral plans at scale 1:5,000 where used for georeferencing field observations and for delimiting map units, subsequently generalized on the 1:10,000 topographic base map. The final map was published on sheets at scale 1:20,000 along with descriptive texts. Besides, data on about 15,000 described and analyzed soil profiles were reported in technical annexes. With the advent of computers, data on soil profiles have been transfered into relational databases and soil sheets have been digitized. Coding of the data rendered them more accessible, but inevitably implied a standardization and hence a reduction of some information. Still most of the soil surveyors have already passed away, besides their intangible expert knowledge, a wealth of information is also being lost when their field notes, unpublished reports, minutes of meetings and draft maps are being disregarded. The map legend was developed during the first decade of the survey, reflecting state of knowledge on soil formation and their relative importance for agricultural land-use in the 1950s. To guarantee that future generations will be able to appreciate the value and concepts underpinning the soil information, it is important that at least a minimum set of such historical documents would be preserved, analyzed and documented. [less ▲]

Detailed reference viewed: 13 (3 ULg)
Full Text
Peer Reviewed
See detailThe Belgium soil survey project: A heritage to preserve
Legrain, Xavier ULg; Dondeyne, Stefaan; Deckers, Jozef et al

Conference (2012, July 06)

Between 1947 and 1991, soils of Belgium were mapped to establish a systematic inventory of the country soil resources. Field observations were done by soil auger to a standard depth of 1.25 m and at a ... [more ▼]

Between 1947 and 1991, soils of Belgium were mapped to establish a systematic inventory of the country soil resources. Field observations were done by soil auger to a standard depth of 1.25 m and at a mean density of 2 points per hectare. Cadastral plans at scale 1:5,000 where used for georeferencing field observations and for delimiting map units, subsequently generalized on the 1:10,000 topographic base map. The final map was published on sheets at scale 1:20,000 along with descriptive texts. Besides, data on about 15,000 described and analyzed soil profiles were reported in technical annexes. With the advent of computers, data on soil profiles have been transfered into relational databases and soil sheets have been digitized. Coding of the data rendered them more accessible, but inevitably implied a standardization and hence a reduction of some information. Still most of the soil surveyors have already passed away, besides their intangible expert knowledge, a wealth of information is also being lost when their field notes, unpublished reports, minutes of meetings and draft maps are being disregarded. The map legend was developed during the first decade of the survey, reflecting state of knowledge on soil formation and their relative importance for agricultural land-use in the 1950s. To guarantee that future generations will be able to appreciate the value and concepts underpinning the soil information, it is important that at least a minimum set of such historical documents would be preserved, analyzed and documented. [less ▲]

Detailed reference viewed: 25 (4 ULg)
Full Text
Peer Reviewed
See detailDRIVING FACTORS OF SOIL FERTILITY IN MOUNTAIN TERRACED PADDY FIELDS OF YUANYANG (CHINA)
Colinet, Gilles ULg; Wu, Bozhi; Li, Yongmei et al

Poster (2012, July)

Detailed reference viewed: 15 (0 ULg)
See detailLa Carte des Sols de la Belgique, outil d'estimation de la pression urbanistique sur les sols
Legrain, Xavier ULg; Michel, Brieuc ULg; Bock, Laurent ULg et al

Conference (2012, March 20)

Ces dernières décennies, des pressions de tout ordre ont induit une forte expansion de l’urbanisation en Europe, à laquelle la Belgique n’échappe pas. L’imperméabilisation des sols a par ailleurs été ... [more ▼]

Ces dernières décennies, des pressions de tout ordre ont induit une forte expansion de l’urbanisation en Europe, à laquelle la Belgique n’échappe pas. L’imperméabilisation des sols a par ailleurs été identifiée comme une des principales menaces pesant sur eux. Au-delà du constat de l’évolution des surfaces artificialisées en Wallonie, l’objectif de cette étude est d’identifier les sols les plus soumis à ce phénomène. L’élaboration de la Carte Numérique des Sols de Wallonie (CNSW) – à partir d’un document historique, la Carte des Sols de la Belgique levée à grande échelle entre 1947 et 1991 – et de la Carte Numérique d’Occupation des Sols de Wallonie ouvre des perspectives intéressantes à ce sujet. Plus spécifiquement, l’utilisation de cartes d’aptitude des sols pour l’agriculture, dérivées de la CNSW, met en évidence l’impact de l’artificialisation sur la réserve en sols de meilleure potentialité agricole (figure 1). Cette dernière a diminué de 5 % à l’échelle de la Wallonie suite à l’artificialisation des sols ces 60 dernières années. La réalité est plus contrastée à l’échelle locale. La moitié des 262 communes wallonnes se situe en deçà, tandis que d’autres ont perdu (du point de vue agricole) jusqu’à 50 % de leurs meilleurs sols, par ailleurs initialement fortement présents sur leur territoire. Autre constat : si la moitié des communes subit une artificialisation uniforme de ses sols, 20 % d’entre elles voient leurs meilleurs sols préférentiellement artificialisés par rapport à ceux de potentialité agricole moindre.Une analyse spatiale fine à plus grande échelle (figure 2) ouvre la voie à la compréhension des phénomènes en jeu et in fine à l’élaboration de recommandations face à la concurrence inévitable entre deux fonctions essentielles des sols : la production agricole et le support des activités humaines. [less ▲]

Detailed reference viewed: 37 (6 ULg)
Full Text
Peer Reviewed
See detailDevelopment of a regional-scale library of near infrared reflectance soil spectra for alternative assessment of soil characteristics in Southern Belgium
Genot, Valérie ULg; Dardenne, Pierre; Bock, Laurent ULg et al

Poster (2012)

In Walloon Region (Southern Belgium), five routine soil laboratories are grouped within a network promoting a better quality in analysis (www.requasud.be). The harmonization of protocols as well as ... [more ▼]

In Walloon Region (Southern Belgium), five routine soil laboratories are grouped within a network promoting a better quality in analysis (www.requasud.be). The harmonization of protocols as well as methodological or technical prospective are realized under scientifically supervision of our research laboratory. In this context, a study was conducted to evaluate the ability of the NIRS to predict some soil properties: CEC, TOC, TN and clay content. The initial models were elaborated upon local PLS regression on set of 1 300 soil samples. The local PLS calibration used allows an accurate prediction of the soil properties and precision of NIRS technique is comparable to reference analytical method [less ▲]

Detailed reference viewed: 18 (1 ULg)