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A comparison of mortality rates between top height trees and average site trees / Daniel Mailly in Annals of Forest Science, Vol 66 n° 2 (march 2009)  

Public [article]  inAnnals of Forest Science > Vol 66 n° 2 (march 2009) . - n° 202 Titre : A comparison of mortality rates between top height trees and average site trees Titre original : Étude comparative des taux de mortalité entre les arbres dominants et les arbres indicateurs moyens de la station Type de document : Article/Communication Auteurs : Daniel Mailly, Auteur ; Mélanie Gaudreault, Auteur ; Geneviève Picher, Auteur ; Isabelle Auger, Auteur ; David Pothier, Auteur Année de publication : 2009 Article en page(s) : n° 202 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Végétation [Termes IGN] arbre dominant [Termes IGN] dépérissement [Termes IGN] indicateur biologique [Termes IGN] mortalité [Termes IGN] Québec (Canada) Résumé : (auteur) Although comparisons between methods of selecting trees for site index estimates are well documented in the literature, little is known on mortality rates of different canopy tree cohorts used for that purpose. This study was initiated to test the hypothesis that the mortality rates of top height trees are lower than those of codominants only or a combination of codominant and dominant trees. To test this hypothesis, we used records from a network of permanent sample plots in Québec and studied the fate of different cohorts of site trees for five different species. Our results did not show clear evidence of lower mortality rates for top height trees. Instead we found that depending on the species, top height trees have lower (Populus tremuloides, Pinus banksiana), higher (Picea mariana, Abies balsamea) or equal mortality rates (Betula papyrifera) than codominant trees or codominant and dominant trees combined. These results suggest a tendency for shade intolerant species to maintain lower top height tree mortality rates over time when compared to shade tolerant species. In the latter case, it is also shown that spruce budworm epidemics (Choristoneura fumiferana) did not change the pattern of mortality rates of site trees of A. balsamea. Numéro de notice : A2009-713 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1051/forest/2008084 Date de publication en ligne : 28/02/2009 En ligne : https://doi.org/10.1051/forest/2008084 Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=71942 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
IFN-001-P000317	PER	Revue	Nogent-sur-Vernisson	Salle périodiques	Exclu du prêt

Predicting decay and round-wood end use volume in trembling aspen (Populus tremuloides Michx.) / Robert Schneider in Annals of Forest Science, Vol 65 n° 6 (September 2008)  

Public [article]  inAnnals of Forest Science > Vol 65 n° 6 (September 2008) . - n° 608 Titre : Predicting decay and round-wood end use volume in trembling aspen (Populus tremuloides Michx.) Titre original : Prévision du volume de bois carié et de la répartition par produits chez le peuplier faux-tremble (Populus tremuloides Michx.) Type de document : Article/Communication Auteurs : Robert Schneider, Auteur ; Martin Riopel, Auteur ; David Pothier, Auteur ; Lévis Côté, Auteur Année de publication : 2008 Article en page(s) : n° 608 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] bois sur pied [Termes IGN] gestion forestière [Termes IGN] modèle mathématique [Termes IGN] Populus tremuloides [Termes IGN] Québec (Canada) [Termes IGN] régression linéaire [Termes IGN] volume en bois Résumé : (auteur) In Quebec (Canada), predicting net merchantable volume of standing trees is essential to adjust stumpage fees. Furthermore, round-wood end use is important in the provincial forest management context because it is used to split the allowable annual cut among the different mill types. A method relying on linear, binomial and cumulative logit regressions is proposed to predict both decay volume and round-wood end use volume. Tree age, height and quality, as well as ecological region, stand origin and presence of Phellinus tremulae (Bond.) Bond. & Boriss. and Ceratocystis fimbriata (Ellis & Halst.) fungi are the main factors that contribute to the presence and the proportion of decayed merchantable volume. Once the net merchantable volume is estimated, its division into round-wood end use is estimated through a series of steps involving the presence of Phellinus tremulae, saw log height, stem quality and size as explanatory variables. The first step is a multinomial regression which predicts the number of end uses (pulp wood, low-grade saw logs, saw logs, low-grade veneer, and veneer) that are present in the stem. A series of logistic regressions then determines the presence of each end use, with linear regressions predicting the round-wood volume of each end use. Numéro de notice : A2008-697 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1051/forest:2008042 Date de publication en ligne : 04/09/2008 En ligne : https://www.afs-journal.org/articles/forest/abs/2008/06/f07223/f07223.html Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=70781 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
IFN-DIR-P000123	PER	Revue	Nogent-sur-Vernisson	Salle périodiques	Exclu du prêt