References of "Ligot, Gauthier"
     in
Bookmark and Share    
Full Text
See detailModélisation du transfert radiatif en forêts feuillues ardennaises : adaptation de la librairie Samsaralight
Ligot, Gauthier ULg; Jonard, Mathieu; de Coligny, François et al

Conference (2013, April 08)

Detailed reference viewed: 15 (4 ULg)
Full Text
See detailQuel type de peuplement pour un renouvellement naturel du douglas?
Petit, Sébastien; Claessens, Hugues ULg; Ligot, Gauthier ULg

in Forêt Wallonne (2013), 122

L'article identifie les caractéristiques des peuplements de douglas qui favoriseraient l'obtention de régénération naturelle. Les seuils d'apparition de la régénération semble facilement atteint. L ... [more ▼]

L'article identifie les caractéristiques des peuplements de douglas qui favoriseraient l'obtention de régénération naturelle. Les seuils d'apparition de la régénération semble facilement atteint. L'article encourage donc les gestionnaires à renouveler leur peuplement de manière naturelle. [less ▲]

Detailed reference viewed: 29 (11 ULg)
Full Text
Peer Reviewed
See detailModeling recent bark stripping by red deer (Cervus elaphus) in South Belgium coniferous stands
Ligot, Gauthier ULg; Gheysen, Thibaut; Lehaire, François ULg et al

in Annals of Forest Science : a Multidisciplinary and International Journal (2012)

Detailed reference viewed: 71 (59 ULg)
Full Text
Peer Reviewed
See detailThe detection and characterization of broad-leaved forest canopy gaps: a regeneration perspective
Bonnet, Stéphanie ULg; Bauwens, Sébastien; Lehaire, François ULg et al

Poster (2012, September)

Canopy gaps are areas of high regeneration potential and, in uneven-aged forest, gaps are therefore places of particular care for the forest manager. Nevertheless the cartography and characterization of ... [more ▼]

Canopy gaps are areas of high regeneration potential and, in uneven-aged forest, gaps are therefore places of particular care for the forest manager. Nevertheless the cartography and characterization of canopy gaps are complex issues. This paper addresses the fundamental question of the canopy gap definition: what is the minimal area, the maximal height of vegetation, type of regeneration, etc? From a regeneration point of view, canopy gaps can be defined as holes in the forest cover where light conditions are suitable for recruitment. As an active sensor, LiDAR has made it possible to tackle the problems of shadows and penetration into the canopy, typical of aerial images. This study investigates the cartography and characterization of forest canopy gaps as areas of natural regeneration. [less ▲]

Detailed reference viewed: 31 (13 ULg)
Full Text
Peer Reviewed
See detailAssessing and Harmonizing Lying Deadwood Volume with Regional Forest Inventory Data in Wallonia (Southern Region of Belgium)
Ligot, Gauthier ULg; Lejeune, Philippe ULg; Rondeux, Jacques ULg et al

in Open Forest Science Journal (2012), 5

Using lying deadwood or coarse woody debris (CWD) is on the rise among national and local forest inventories. We compared two generally recommended methods for lying deadwood: line intersect sampling and ... [more ▼]

Using lying deadwood or coarse woody debris (CWD) is on the rise among national and local forest inventories. We compared two generally recommended methods for lying deadwood: line intersect sampling and fixed area sampling. We assessed both methods in plots of the regional forest inventory of Wallonia (southern region of Belgium) and we developed bridging functions that converts CWD volume estimates to estimates that would have been obtained with different thresholds. [less ▲]

Detailed reference viewed: 46 (14 ULg)
Full Text
See detailSimuler la ressource forestière à l'échelle d'un massif : application de SIMMEM et GYMNOS
Ligot, Gauthier ULg; Vallet, Patrick; Perin, Jérôme ULg et al

Conference (2012, April 02)

Detailed reference viewed: 24 (9 ULg)
Full Text
Peer Reviewed
See detailHarmonized Growth Models and Simulations of the Evolution of Pure Stands of Norway spruce, Larches and Douglas-fir for Southern Belgium (Wallonia).
Perin, Jérôme ULg; Ligot, Gauthier ULg; Cerisier, François ULg et al

Poster (2012, March 02)

In order to compare different silvicultural scenarios we have undertaken the development of a software that can simulate stand evolution in regards to their species composition, site characteristics and ... [more ▼]

In order to compare different silvicultural scenarios we have undertaken the development of a software that can simulate stand evolution in regards to their species composition, site characteristics and silvicultural operations. As a first approach we limited the scope of our work to even-aged and pure coniferous stands of the three most important coniferous species in Wallonia (southern part of Belgium): Norway spruce (Picea abies), douglas-fir (Pseudotsuga menziensii) and larches (Larix sp.). This presentation introduces carried out simulations and compare their outcomes. First we gathered data sets from the permanent regional inventory, from observation networks and experimental plots throughout Wallonia. Then we adjusted, for these species, harmonized and distance-independent models of dominant-height growth, tree diameter growth, mortality, and the distribution of tree diameter frequency before the first thinning. Next we implemented those models in the Capsis platform, and we simulated, for the three species, the evolution of virtual stands using different scenarios. On one hand the evolution was performed without thinning, and on the other hand we applied silvicultural scenarios that are commonly used in Wallonia. As a result these models highlight, for example, the great juvenile growth and sensibility to stands density of larches whereas Norway spruce behaves the opposite. Further work is however needed to predict and simulate wood quality and value. Once this will be achieved we will attempt to optimize silvicultural scenarios for the three species. [less ▲]

Detailed reference viewed: 34 (9 ULg)
Full Text
Peer Reviewed
See detailStructure spatiale des arbres des savanes boisées et forêts claires soudaniennes : implication pour les enrichissements forestiers
Fonton, Noël Houédougbé; Atindogbe, Gilbert; Fandohan, Belarmain et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2012), 16(4), 429-440

During the last decade, management of woodlands in the Sudanian region of Benin has been based on enrichment with valuable tree-species. Yet, no previous research has been undertaken to support enrichment ... [more ▼]

During the last decade, management of woodlands in the Sudanian region of Benin has been based on enrichment with valuable tree-species. Yet, no previous research has been undertaken to support enrichment design with respect to plant eye view, tree growth magnitude or survival capacity under local forest environments. To fill in this gap, Ripley's K function was used to assess the spatial pattern of trees, diameter classes and dominant valuable species in the Sudanian zone. Data were collected in four sites of variable size (150 X 100 m, 150 X 100 m, 100 X 50 m and 150 X 150 m). Mostly, the spatial patterns of the target species revealed small-clumps. Within these small-clumps, intraspecific repulsions were observed on average at a 3 m scale, while interspecific repulsions were noticed at a 4.5 m scale. Only a weak repulsion between diameter size was also remarked, suggesting that proximity to adult trees would not affect the survival of young plants. With regard to observed repulsion scales, we would suggest using a minimum of a 3 m space between trees of the same species and a 4.5 m space between trees of different species, for enrichment plantings in Sudanian woodlands, if based on the target species. However, this suggested spacing may not be optimal with regard to plant growth. Further investigation is needed to address this aspect. [less ▲]

Detailed reference viewed: 12 (2 ULg)
Full Text
See detailLe DouglasModel et nos futurs projets CAPSIS
Ligot, Gauthier ULg; Perin, Jérôme ULg; de Pierpont, Astrid ULg

Conference (2011, April 06)

Detailed reference viewed: 22 (9 ULg)
Full Text
See detailR en 30 minutes
Ligot, Gauthier ULg

Learning material (2011)

R basics

Detailed reference viewed: 32 (17 ULg)
Full Text
Peer Reviewed
See detailA Regional Inventory and Monitoring Setup to Evaluate Bark Peeling Damage by Red Deer (Cervus Elaphus) in Coniferous Plantations in Southern Belgium
Gheysen, Thibaut; Brostaux, Yves ULg; Hebert, Jacques ULg et al

in Environmental Monitoring & Assessment (2010)

Bark peeling by red deer (Cervus elaphus L.) has become a serious issue for productive forests in western Europe. The damage is particularly severe on species such as spruce, as these become vulnerable to ... [more ▼]

Bark peeling by red deer (Cervus elaphus L.) has become a serious issue for productive forests in western Europe. The damage is particularly severe on species such as spruce, as these become vulnerable to fungus attacks that result in considerably depreciated timber. This article presents a monitoring setup for recent bark peeling damage in spruce plantings in Wallonia (southern part of Belgium). This setup implies to collect data annually from a survey involving cluster sampling. It has been employed since 2004 in coniferous stands amounting to 165,000 ha of land, where Norway spruce is the predominant species. The study area was divided into blocks delineated along features preventing deer migrations. A set of indicators was computed either at the whole study area level or at block level. The resulting set of indicators enabled forest managers to follow up debarking intensity in productive forests. Additional analyses were carried out in order to assess the relationship between the social position of trees in the stand and the debarking probability on the one hand, and the relationship between the variation in damage magnitude and seasonality, namely summer versus winter, on the other hand. [less ▲]

Detailed reference viewed: 78 (42 ULg)
Full Text
See detailLe chêne en forêt ardennaise, un atout à préserver
Alderweireld, Matthieu ULg; Ligot, Gauthier ULg; Latte, Nicolas ULg et al

in Forêt Wallonne (2010), 109(6), 10-24

Dans la forêt ardennaise, les chênes sont en nette diminution. Plusieurs facteurs sont responsables de cette diminution, voici quelques exemples : régénération plus difficile que le hêtre, abroutissement ... [more ▼]

Dans la forêt ardennaise, les chênes sont en nette diminution. Plusieurs facteurs sont responsables de cette diminution, voici quelques exemples : régénération plus difficile que le hêtre, abroutissement par le gibier, mauvaise réputation de la qualité du chêne ardennais dû aux anciens traitements, conditions de marché du bois défavorable aux essences à grandes révolution. Pourtant, ces dernières années, on prend conscience de leur importance. Les apports du chêne dans la hêtraie ardennaise sont nombreux, notamment dans le contexte du changement climatique : le chêne favorise le développement d’un cortège d’organismes diversifiés, favorise la décomposition de la litière et la fertilité des sols, permet l’exploitation des stations impropres au hêtre, favorise la stabilité des peuplements et permet la production de bois de qualité. Favoriser la régénération du chêne requiert une sylviculture interventionniste, les éléments principaux sont l’apport de lumière et la protection contre le gibier. Même s’il est possible de donner des pistes pour favoriser le chêne, de nombreuses questions se posent encore. Dans le contexte de l’Accord-cadre de recherche et vulgarisation forestières, l’ULg (GxABT) et l’UCL ont mis en place des dispositifs qui devraient bientôt permettre de mettre au point des scénarios sylvicoles. [less ▲]

Detailed reference viewed: 41 (17 ULg)
Full Text
See detailL'inventaire du bois mort à terre
Ligot, Gauthier ULg; Rondeux, Jacques ULg

Poster (2010, May 12)

Le bois mort à terre est devenu un indicateur reconnu de la biodiversité et de la gestion durable des forêts. Il importe donc de pouvoir apprécier les quantités de mort à l'hectare. Choisir la méthode d ... [more ▼]

Le bois mort à terre est devenu un indicateur reconnu de la biodiversité et de la gestion durable des forêts. Il importe donc de pouvoir apprécier les quantités de mort à l'hectare. Choisir la méthode d'échantillonnage à utiliser reste une tâche ardue bien qu'il existe une abondante littérature sur le sujet. Ce poster compare deux techniques généralement utilisées : les placettes de taille fixe et les transects. Nous avons évalué ces deux méthodes aussi bien à l'échelle locale que nationale et au travers de simulations statistiques nous en avons évalué la précision et l'efficacité. De plus, nous mettons en évidence l'importance d'utiliser des fonctions de conversion des estimations obtenues dans un but d'harmonisation internationale des résultats. [less ▲]

Detailed reference viewed: 29 (5 ULg)