References of "Rondeux, Jacques"
     in
Bookmark and Share    
Full Text
See detailMaladie du hêtre. Bilan chiffré de la situation à l'été 2001
Rondeux, Jacques ULg; Bourland, Nils ULg; Huart, O. et al

in Forêt Wallonne (2002), (60), 2-3

Durant l'été 2001, un inventaire des dégâts occasionnés par la maladie du hêtre à été réalisé. Les résultats de cette étude ont été publiés dans la revue Silva belgica. Nous en reprenons ici la conclusion ... [more ▼]

Durant l'été 2001, un inventaire des dégâts occasionnés par la maladie du hêtre à été réalisé. Les résultats de cette étude ont été publiés dans la revue Silva belgica. Nous en reprenons ici la conclusion ainsi que quelques-uns des nombreux graphiques et tableaux qui y sont présentés. Nous invitons le lecteur intéressé à se référer à l'article original. [less ▲]

Detailed reference viewed: 27 (9 ULg)
Full Text
See detailImportance et dispersion de la maladie du hêtre en Région wallonne. Premier résultats d'un inventaire spécifique
Rondeux, Jacques ULg; Bourland, Nils ULg; Huart, O. et al

in Silva Belgica (2002), 109(3), 22-30

Suite aux attaques massives de scolytes sur les hêtres de Gaume et surtout d'Ardenne au printemps 2001, un inventaire spécifique a été mené dans les hêtraies publiques de Wallonie. Les auteurs se ... [more ▼]

Suite aux attaques massives de scolytes sur les hêtres de Gaume et surtout d'Ardenne au printemps 2001, un inventaire spécifique a été mené dans les hêtraies publiques de Wallonie. Les auteurs se proposent de vous présenter une première analyse des résultats. [less ▲]

Detailed reference viewed: 92 (12 ULg)
Full Text
See detailLe mélange épicéa-douglas, une association intéressante pour le sylviculteur ? 1ère partie
Colson, Vincent ULg; Claessens, Hugues ULg; Pauwels, D. et al

in Silva Belgica (2002), 109(3), 34-38

Detailed reference viewed: 52 (9 ULg)
Full Text
See detailLe mélange épicéa-douglas, une association intéressante pour le sylviculteur ? 2e partie
Colson, Vincent ULg; Claessens, Hugues ULg; Pauwels, D. et al

in Silva Belgica (2002), 109(4), 25-31

Detailed reference viewed: 28 (7 ULg)
Full Text
See detailForet privée et politique forestière en Région wallonne.
Colson, Vincent ULg; Hebert, Jacques ULg; Rondeux, Jacques ULg

Book (2002)

In Wallonia, private forest accounts for more than 50 % of the regional forest. The ownerships are very scattered and heterogeneous. One must never forget the extraordinary number of small properties and ... [more ▼]

In Wallonia, private forest accounts for more than 50 % of the regional forest. The ownerships are very scattered and heterogeneous. One must never forget the extraordinary number of small properties and the diver-sity of attitudes underlying woodland ownership. Such diverse approaches remain a handicap to judicious forest development, which is exacerbated by the lack of a fully comprehensive regional forest policy. A comparison is made with the French private forest which has a similar structure but for which a specific forest policy has been developed and continuously improved for about 40 years. [less ▲]

Detailed reference viewed: 75 (16 ULg)
Full Text
Peer Reviewed
See detailMise au point d'un modèle cartographique pour la description des stations forestières en Ardenne belge.
Claessens, Hugues ULg; Lejeune, Philippe ULg; Cuvelier, M. et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2002), 6(4), 209-220

The paper presents an original method dealing with the forest site types delineation. The suggested method consists in integrating a typological key in a GIS aiming at producing a thematic map that ... [more ▼]

The paper presents an original method dealing with the forest site types delineation. The suggested method consists in integrating a typological key in a GIS aiming at producing a thematic map that describes forest site types. Data used are the soil map of Belgium (digitized at the scale 1:20,000) and a digital elevation model built from a topographic map (scale 1:10,000). The typological key is mainly based on the methodology used by Thill et al. (1988) in the site types system for central Ardenne, the potential vegetation map of Sougnez and Dethioux (1975) and the ecoregion map of Delvaux and Galoux (1962). In that respect, site types are closely linked to the soil map and the phytosociological classification. So, they can be connected to the afforestation guide and different phytosociological and autecological studies concerning forest species. It is then possible to map the potential habitats or the site potentialities related to tree species. The key is valid for the Ardenne ecoregion located in Southern Belgium (elevation higher than 300 m). It has to be validated through an intensive use in the field, taking into account its imprecision linked to the types of collected data, chieffly those being digitized. The integration of such a tool in a SIG can be considered as an original way in terms of integrated forest management or forest sites description in the context of the project “Natura 2000” launched by the European Union. The study has been carried out within the framework of an experimental integrated management project concerning the Saint-Hubert forest (17,000 ha). [less ▲]

Detailed reference viewed: 141 (29 ULg)
Full Text
See detailLa forêt et la protection du sol dans le cadre d'aménagement forestiers intégrés
Huart, O.; Adam, V.; Quevy, B. et al

in Fiche technique (2002), (14),

Detailed reference viewed: 24 (6 ULg)
Full Text
See detailLa gestion forestière durable en Région wallonne, intégration d'indicateurs appropriés à l'inventaire permanent
Lecomte, H.; Koestel, G.; Rondeux, Jacques ULg

Book (2002)

The permanent forest inventory used in Wallonie since 1994 has been launched, as many others, to support a regional forest policy and evaluate wood forest products. To take into account criteria and ... [more ▼]

The permanent forest inventory used in Wallonie since 1994 has been launched, as many others, to support a regional forest policy and evaluate wood forest products. To take into account criteria and indicators of sustainable forest management, especially proposed by the Helsinki conference, some aspects of the methodology have been adapted and new variables have been collected in the field of ecological parameters (soil, lesser vegetation, ecosystem and species diversity, biomass, global carbon budget, forest health, physical environmental factors). This paper provides some insight into the way used to collect, through a regional permanent forest inventory, a large amount of components dealing with forest sustainability. An important database provides useful baseline information for fu-ture management decisions and can be considered as the best achieved tool for monitoring progress toward sustainable forest management at a regional level. [less ▲]

Detailed reference viewed: 41 (5 ULg)
Full Text
See detailChoisir un scénario sylvicole pour les mélèzes
Pauwels, D.; Lejeune, Philippe ULg; Rondeux, Jacques ULg

in Forêt Wallonne (2002), (61), 17-24

Le choix du traitement sylvicole à appliquer à un peuplement forestier est une démarche qui peut s’avérer très complexe si l’on tient compte des délais entre la plantation et la récolte du peuplement ... [more ▼]

Le choix du traitement sylvicole à appliquer à un peuplement forestier est une démarche qui peut s’avérer très complexe si l’on tient compte des délais entre la plantation et la récolte du peuplement final, de l’évolution des filières de transformation, ou encore de la multiplicité des objectifs que peut poursuivre le gestionnaire forestier. [less ▲]

Detailed reference viewed: 66 (7 ULg)
Full Text
Peer Reviewed
See detailÉtude dendrométrique d’Acacia auriculiformis A. Cunn. ex Benth. en mélange sur vertisol au Bénin
Fonton, N. H.; Glele Kakai, R.; Rondeux, Jacques ULg

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2002), 6(1), 29-37

Acacia auriculiformis is a fast growing species planted on vertisols in Benin. An inventory of 11 mixed stands of Acacia, which are 7 to 9 years old, has been realized to estimate growth parameters of the ... [more ▼]

Acacia auriculiformis is a fast growing species planted on vertisols in Benin. An inventory of 11 mixed stands of Acacia, which are 7 to 9 years old, has been realized to estimate growth parameters of the stands. The present study shows that, for the dendrometrical parameters, there is no difference between species associations at a 0.05 significance level. Nevertheless, the largest values of quadratic mean diameter of the stems foot are observed in the species associations including Leucaena leucocephala. Moreover, the branch volume decreases with the increasing of the number of stems per tree. The most appropriate volume function for Acacia auriculiformis is the one that takes into account the diameter of the stems foot and the total height. Otherwise, the species associations do not influence the profile of Acacia trees, which is constant within the associations. The predicted conversion and cutting coefficients show that the stacked wood volume represents about 144 % of the real stand volume. [less ▲]

Detailed reference viewed: 126 (13 ULg)
Full Text
See detailLa gestion forestière durable en Région wallonne, l'apport de l'inventaire permanent.
Koestel, G.; Lecomte, H.; Rondeux, Jacques ULg

Book (2002)

The objective of this paper is to examine the feasability of using the walloonian permanent forest inventory to monitor maintenance of the sustainability forest management over time. Criteria and in ... [more ▼]

The objective of this paper is to examine the feasability of using the walloonian permanent forest inventory to monitor maintenance of the sustainability forest management over time. Criteria and in-dicators which were designed to be used in assessing such a sustainability, as acted in the interna-tional conference of Helsinki, have been analysed to serve at a regional level. The variables selected to define or to be considered as components of indicators have been divided by various types according to 4 classes : “initial” variables (already available in the existing inventory), “calculated” variables (is-sued from data processing or data transformation), “new variables” (addressing parameters less linked to traditional forest inventories), “non relevant” variables (the level and the nature of which cannot be considered in the used sampling method). Slight modifications affecting the design of the inventory and some new observations seem to be sufficient to meet the requirements of a comprehensive monitoring of a sustainable forestry. [less ▲]

Detailed reference viewed: 41 (7 ULg)
Full Text
Peer Reviewed
See detailQuelques résultats prometteurs pour une sylviculture de l'Aulne glutineux en Wallonie.
Claessens, Hugues ULg; Thibaut, A.; Rondeux, Jacques ULg

in Revue Forestière Française (2002), 54(3), 259-270

In Belgium, black alder is well known for its ecological functions, but is generally considered as a secondary species without any true economic value. The present study, based on data pertaining to 166 ... [more ▼]

In Belgium, black alder is well known for its ecological functions, but is generally considered as a secondary species without any true economic value. The present study, based on data pertaining to 166 plots, aims at evaluating the potential of black alder silviculture in the Walloon forest (Southern Belgium). We successively analysed dominant height growth, dominant girth growth and solid stem volume over time. It appears that by controlling competition within stands it should be possible to produce quality, 150-cm girth logs within 50 – 100 years, depending on the level of productivity. The German tables of Mitscherlich (in Schöber, 1975) seem to be most suitable for describing the growth parameters of the Belgian alder stands over time and black alder stand production can be estimated at 3 to 9 m3/ha/year according to site classes. We can conclude that black alder silviculture can be a viable economic activity. [less ▲]

Detailed reference viewed: 41 (9 ULg)
Full Text
See detailInventaire forestier et biodiversite.
Rondeux, Jacques ULg

Book (2002)

In forestry as well as in other areas we need methods to assess biodiversity in such a way that decision-makers can appreciate biodiversity values. How to measure biodiversity is open to debate and ... [more ▼]

In forestry as well as in other areas we need methods to assess biodiversity in such a way that decision-makers can appreciate biodiversity values. How to measure biodiversity is open to debate and opinion often differ about the definition of this complex concept. It is obvious from the wide definition of biodiversity that it is impossible to monitor all the expected and unexpected variability. Traditional forest inventories have the main objective to provide only information on timber, its amount and the evolution over time. Nowadays the inclusion of non-timber variables in forest inventories is gaining importance. In more and more inventories some environmental variables are considered such as site or vegetation variables. Considering the assessment of biodiversity (for vegetation point of view) the scope of most forest inventories has to be expanded to include additional variables and the design of the inventories has to be changed. The objective of this paper is to analyse various aspects of forest surveys with respect to biodiversity issues and to emphasize the current needs for further methodological progress. The attention is put on the assessment and monitoring of the biodiversity in sample based surveys at the forest stand level or at a national level. Indirect methods might be alternative solutions like studying the relationships between structure of growing stock and other species like ground vegetation, polypore. Field measurement, air and space borne remote sensing should also be other relevant data sources to be taken into account. If a great number of biodiviersity elements can be derived by means of variables measured in forest inventories, other new variables have to be considered. It seems to be realistic to use forest inventories for getting informations upon biodiversity at regional or national levels provided problems of space and scale are not underestimated. [less ▲]

Detailed reference viewed: 50 (7 ULg)
Peer Reviewed
See detailA silvicultural decision support system for pure larch stands: helping managers to meet their goals.
Pauwels, D.; Lejeune, Philippe ULg; Balandier, P. et al

in Improvement of larch (Larix sp.) for better growth, stem form and woodquality. Proceedings of an International Symposium, Gap (Hautes-Alpes)- Auvergne & Limousin, France, 16-21 September, 2002. (2002)

Detailed reference viewed: 27 (5 ULg)
Full Text
See detailCellule "Base De Données"
Govaerts, P.; Corten, P.; Costermans, D. et al

Report (2001)

Detailed reference viewed: 17 (5 ULg)
Full Text
See detailL'inventaire forestier wallon.
Rondeux, Jacques ULg; Lecomte, Hugues

in Revue Forestiere Francaise (2001), 53(3-4), 263-267

Detailed reference viewed: 26 (6 ULg)
Full Text
See detailVers un système d'information régional à caractère territorial
Rondeux, Jacques ULg

in Cahiers de l'Urbanisme (Les) (2001), (34), 73-79

Il n'est pas imaginable de penser, d'agir et de décider en matière de développement du territoire wallon, sans disposer d'informations de qualité sur les différentes facettes de l'occupation de l'espace ... [more ▼]

Il n'est pas imaginable de penser, d'agir et de décider en matière de développement du territoire wallon, sans disposer d'informations de qualité sur les différentes facettes de l'occupation de l'espace et nombre d'activités très diversifiées qui en découlent ou l'influencent. Créer une structure fonctionnelle interactive organisant la cohérence des données pertinentes, disponibles ou à récolter, évaluer leur validité, assurer et contrôler leur diffusion, en un mot gérer celles-ci pour mieux les valoriser justifie la création d'un outil mobilisateur d'aide à la décision dont les principaux objectifs, les concepts, l'organisation et les perspectives sont décrits dans les lignes qui suivent. [less ▲]

Detailed reference viewed: 13 (4 ULg)
Full Text
See detailPlante-t-on l'épicéa n'importe où ? L'apport d'une analyse objective de la pessière wallonne.
Claessens, Hugues ULg; Lecomte, Hugues; Lejeune, Philippe ULg et al

in Forêt Wallonne (2001), (49-50), 45-51

Depuis son introduction dans la sylviculture belge au milieu du XIXe siècle, l'épicéa s'est progressivement imposé principalement grâce à sa bonne adaptation aux difficiles conditions écologiques de l ... [more ▼]

Depuis son introduction dans la sylviculture belge au milieu du XIXe siècle, l'épicéa s'est progressivement imposé principalement grâce à sa bonne adaptation aux difficiles conditions écologiques de l'Ardenne, la facilité de sa culture et sa haute productivité en sols pauvres. Il est devenu la première essence de la forêt wallonne où il représente près de la moitié du volume de bois sur pied. Mais petit à petit, l'impact négatif de sa culture à grande échelle sur l'environnement s'est aussi révélé, notamment lors de son introduction dans des milieux fragiles qu'il a altérés, voire détruits. Ces erreurs ont progressivement amené de plus en plus d'observateurs de notre patrimoine naturel à rejeter globalement l'épicéa et sa culture en Belgique. Ces cas malheureux sur lesquels se sont focalisées l'opinion publique et scientifique sont-ils l'exeption ? Dans quelle mesure l'épicéa a-t-il colonisé à tort certains milieux ? Dans quelles conditions sa culture est-elle acceptable, tolérée ou à exclure ? C'est à ce type de question que la présente étude tente de répondre. [less ▲]

Detailed reference viewed: 122 (18 ULg)
Full Text
Peer Reviewed
See detailInventaire forestier régional et saisie électronique de données : une synergie prometteuse
Rondeux, Jacques ULg; Cavelier, Tristan

in Revue Forestière Française (2001), LIII(1), 81-87

The work done in connection with any regional or national inventory involves collecting huge amounts of increasingly diversified data. To reduce time lags before such data can be processed, we have ... [more ▼]

The work done in connection with any regional or national inventory involves collecting huge amounts of increasingly diversified data. To reduce time lags before such data can be processed, we have developed an encryption system on a HUSKY personal computer that is highly suitable to the sometimes adverse working conditions encountered in forests. The experiment has turned out to be extremely valuable and the system has been in use since mid-2000 for the purposes of the forest inventory in the Walloon Region. Considerable time savings are thus achieved and a highly elaborate computerised validation process and on-line aid to operators have significantly reduced the frequency of errors. [less ▲]

Detailed reference viewed: 7 (2 ULg)