References of "Canadian Journal of Forest Research = Journal Canadien de la Recherche Forestière"
     in
Bookmark and Share    
Full Text
Peer Reviewed
See detailForest radiative transfer models: which approach for which application?
Ligot, Gauthier ULg; Balandier, Philippe; Courbaud, Benoît et al

in Canadian Journal of Forest Research = Journal Canadien de la Recherche Forestière (2014), 44(5), 385-397

Detailed reference viewed: 32 (14 ULg)
Full Text
Peer Reviewed
See detailEffect of growth rate on the natural durability of Douglas-fir in western Europe
Pollet, Caroline; Henin, Jean-Marc; Hebert, Jacques ULg et al

in Canadian Journal of Forest Research = Journal Canadien de la Recherche Forestière (2013), 43(10), 891-896

Douglas-fir is a relatively recent species in the central European forest landscape. It is not clear how its natural durability is influenced by silviculture. We therefore investigated how the natural ... [more ▼]

Douglas-fir is a relatively recent species in the central European forest landscape. It is not clear how its natural durability is influenced by silviculture. We therefore investigated how the natural durability of the (Pseudotsuga menziesii (Mirb.) Franco) Douglas-fir varies according to tree growth rate; subsequently, the influence of the nature of the wood (juvenile or mature) and radial position was also analyzed. For this purposes, a total of 60 trees grown in Wallonia (Southern Belgium) was felled: these consisted of 6 trees in each of 10 stands where the average tree girth was approximately 150 cm. Since the age of these plantations ranged from 40 to 69 years, the radial tree growth rate ranged between approximately 3 and 7 mm. In all the trees, standardized heartwood test specimens were taken from different radial positions in the butt log. The mass losses caused by the fungi Poria placenta and Coniophora puteana were assessed according to CEN/TS 15083-1 (2005). Poria placenta exhibited a higher decaying efficiency than C. puteana, leading to classify Douglas-fir wood as slightly durable (class 4). No difference was observed between the durability against P. placenta of juvenile and mature wood. Similarly, growth rate seemed to have no direct impact on durability. Durability was, however, significantly correlated with wood density. The effect of site and tree on the natural durability of the wood was also examined. [less ▲]

Detailed reference viewed: 28 (12 ULg)
Full Text
Peer Reviewed
See detailCaractérisation de la structure spatiale des individus ligneux dans « une brousse tachetée » au Sud Ouest du Niger.
Diouf, A; Barbier, N; Mahamane, A et al

in Canadian Journal of Forest Research = Journal Canadien de la Recherche Forestière (2010), 40(3), 827-835

Detailed reference viewed: 16 (7 ULg)
Full Text
Peer Reviewed
See detailNatural durability of black locust ( Robinia pseudoacacia L.) wood grown in Wallonia, Belgium
Pollet, Caroline; Jourez, Benoît ULg; Hebert, Jacques ULg

in Canadian Journal of Forest Research = Journal Canadien de la Recherche Forestière (2008), 38(6), 1366-1372

The decay resistance of black locust (Robinia pseudoacacia L.) heartwood was evaluated on standardised test specimens taken from mature and juvenile wood in 25 trees distributed over 5 sites in Wallonia ... [more ▼]

The decay resistance of black locust (Robinia pseudoacacia L.) heartwood was evaluated on standardised test specimens taken from mature and juvenile wood in 25 trees distributed over 5 sites in Wallonia, Belgium. The percentage mass losses caused by the wood-destroying fungi Coriolus versicolor CTB 863 A and Coniophora puteana BAM Ebw.15 were evaluated according to CEN/TS 15083-1 (CEN/TS 15083-1. 2005. Durability of wood and wood-based products – determination of the natural durability of solid wood against wood-destroying fungi, test methods – Part 1 : basidiomycetes. European Comm. For Standardization, Brussels). Black locust is classified as a “very durable” wood (Class 1), while the juvenile heartwood (located near the pith) showed classes 1 to 2. The statistical analysis does not reveal any significant differences among the sites, suggesting that the growth environment of the trees has no effect on their natural durability. However, statistical analysis shows very highly significant differences among trees and between the two radial positions in the tree, mature wood being more resistant than juvenile wood. Using such a naturally very durable species could reduce reliance on preservative treatment and the use of tropical species generally recommended for outdoor woodwork. [less ▲]

Detailed reference viewed: 110 (14 ULg)
Peer Reviewed
See detailComparison of basic density and longitudinal shrinkage in tension wood and opposite wood in young stems of Poplar (P. euramericana cv “ Ghoy ”) when subjected to a gravitational stimulus
Jourez, Benoît ULg; Riboux, Alain; Leclercq, André

in Canadian Journal of Forest Research = Journal Canadien de la Recherche Forestière (2001), 31(10), 1676-1683

In a green house, under controlled conditions, young shoots, taken from poplar cuttings (P. euramericana cv “ Ghoy ”), were artificially inclined in order to quantify the modifications of physical ... [more ▼]

In a green house, under controlled conditions, young shoots, taken from poplar cuttings (P. euramericana cv “ Ghoy ”), were artificially inclined in order to quantify the modifications of physical properties induced by a gravitational stimulus. At the end of the growing season, basic density and longitudinal shrinkage were measured on very small samples taken from pure tension wood tissue observed on the upper face of the inclined axis and compared with opposite wood tissue, free of gelatinous fibers, developed on the opposite lower face. In a second step, shoots bend at two different lean intensities were analyzed. On young poplar wood, gravitational stimulus was found to have a significant effect on physical properties. Relations between basic density and longitudinal shrinkage are different depending on the types of wood considered. Shrinkage appears more sensitive to lean intensity in the range considered here [less ▲]

Detailed reference viewed: 22 (0 ULg)
Full Text
Peer Reviewed
See detailRadial tree-growth modelling with fuzzy regression.
Boreux, Jean-Jacques ULg; Gadbin-Henry, C.; Guiot, Joël et al

in Canadian Journal of Forest Research = Journal Canadien de la Recherche Forestière (1998), 28(8), 1249-1260

A so-called fuzzy linear regression is used in dendroecology to model empirically tree growth as a function of a bioclimatic index representing the water stress, i.e., the ratio of actual ... [more ▼]

A so-called fuzzy linear regression is used in dendroecology to model empirically tree growth as a function of a bioclimatic index representing the water stress, i.e., the ratio of actual evapotranspiration to potential evapotranspiration. The response function predicts tree growth as (fuzzy) intervals, narrow in the domain where the bioclimatic index is most limiting and becoming progressively larger elsewhere. The method is tested with a population of Pinus pineaL. from the Provence region in France. It is shown that fuzzy linear regression gives results comparable with those obtained using a linear response function. The interval of credibility given by the fuzzy regression suggests that more precise expected growth is obtained for high water stress, which is typical of Mediterranean climate. Fuzzy linear regression can be also a method to test different hypotheses on several potential predictors when any further experimental approach is quite impossible as it is for trees in their natural environment. To sum up, fuzzy regression could be a first step before the construction of a kind of growth simulator adapted to different environments of a given species. In environmental sciences, the fuzzy response function thus appears to be an approach between the mechanistic and the statistical descriptive approaches. [less ▲]

Detailed reference viewed: 28 (2 ULg)
Full Text
Peer Reviewed
See detailDéveloppement d'un modèle de type arbre appliqué à la croissance des peuplements feuillus irréguliers du sud de la Belgique
Lejeune, Philippe ULg

in Canadian Journal of Forest Research = Journal Canadien de la Recherche Forestière (1996), 26(10), 1838-1848

A model predicting circumference growth of individual trees has been developed for mixed irregular stands dominated by Fagus silvatica L. in southeastern Belgium. This model integrates simultaneously tree ... [more ▼]

A model predicting circumference growth of individual trees has been developed for mixed irregular stands dominated by Fagus silvatica L. in southeastern Belgium. This model integrates simultaneously tree, stand, and growing site characteristics without considering distances between individual trees. It has a determination coefficent of 40.1 % and a residual standard deviation of 0.45cm/year. Forest mensuration variables considered in the model are circumference, tree social position represented by the total basal area of trees greater than the subject tree, stand basal area, and some index of stand structure corresponding to the ratio of the variance over the mean circumference. The site component is essentially expressed by the length of the growing period. The low accuracy obtained for individual tree growth is relative because the results are used mainly after individual trees have been distributed into size classes. We have been able to show that the introduction of crown description in the model can increase its accuracy. But this modification requires a submodel describing crown changes over time. [less ▲]

Detailed reference viewed: 18 (5 ULg)