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Leaf water status and stem xylem flux in relation to soil drought in five temperate broad-leaved tree species with contrasting water use strategies / Paul Köcher in Annals of Forest Science, Vol 66 n° 1 (January - February 2009)  

Public [article]  inAnnals of Forest Science > Vol 66 n° 1 (January - February 2009) . - n° 101 Titre : Leaf water status and stem xylem flux in relation to soil drought in five temperate broad-leaved tree species with contrasting water use strategies Titre original : Statut hydrique des feuilles et flux xylèmique dans le tronc en relation avec la sécheresse du sol pour cinq espèces d'arbres feuillus tempérés à stratégies de consommation d'eau différentes Type de document : Article/Communication Auteurs : Paul Köcher, Auteur ; Tobias Gebauer, Auteur ; Viviana Horna, Auteur ; Christoph Leuschner, Auteur Année de publication : 2009 Article en page(s) : n° 101 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Végétation [Termes IGN] arbre caducifolié [Termes IGN] nutrition végétale [Termes IGN] peuplement mélangé [Termes IGN] relations plante - sol [Termes IGN] sève [Termes IGN] tronc Résumé : (auteur) Five temperate broad-leaved tree species were compared with respect to their water consumption strategies under ample and restricted water supply. We measured synchronously leaf conductance $(g_{\rm L})$ in the sun canopy, xylem sap flux $(J_{\rm s})$ and leaf water potential (predawn, $\Psi _{\rm pd}$ and noon, $\Psi _{\rm noon}$) in adult trees in a mixed stand and related them to the fluctuations in vapor pressure deficit (D) and soil moisture. • Maximum $g_{\rm L}$ was particularly high in F. excelsior, C. betulus and T. cordata and revealed a higher D sensitivity. $\Psi _{\rm pd}$ remained constantly high in A. pseudoplatanus, C. betulus and F. excelsior, but decreased in T. cordata and F. sylvatica with decreasing soil moisture. • $J_{\rm sd}$ decreased linearly with decreasing soil matrix potential in all species except for F. excelsior. Apparent hydraulic conductance in the soil-to-leaf flow path $(L_{\rm c})$ was higher in A. pseudoplatanus than in the other species. • F. sylvatica maintained a low maximum $g_{\rm L}$ and reduced $J_{\rm sd}$ markedly upon drought, but faced severe decreases in $\Psi _{\rm pd}$ and $\Psi _{\rm noon}$. F. excelsior represents an opposite strategy with high maximum $g_{\rm L}$ and stable $\Psi _{\rm pd}$. • The species drought sensitivity increases in the sequence F. excelsior Numéro de notice : A2009-723 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1051/forest/2008076 Date de publication en ligne : 31/01/2009 En ligne : https://www.afs-journal.org/articles/forest/abs/2009/01/f08128/f08128.html Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=71759 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
IFN-DIR-P000294	PER	Revue	Nogent-sur-Vernisson	Salle périodiques	Exclu du prêt

Why and where do adult trees die in a young secondary temperate forest? The role of neighbourhood / José Miguel Olano in Annals of Forest Science, Vol 66 n° 1 (January - February 2009)  

Public [article]  inAnnals of Forest Science > Vol 66 n° 1 (January - February 2009) . - n° 105 Titre : Why and where do adult trees die in a young secondary temperate forest? The role of neighbourhood Titre original : Pourquoi et où les arbres adultes meurent dans une jeune forêt tempérée ? Le rôle du voisinage Type de document : Article/Communication Auteurs : José Miguel Olano, Auteur ; Nere Amaia Laskurain, Auteur ; Adrián Escudero, Auteur ; Marcelino De La Cruz, Auteur Année de publication : 2009 Article en page(s) : n° 105 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] dépérissement [Termes IGN] forêt tempérée [Termes IGN] modèle mathématique [Termes IGN] mortalité [Termes IGN] peuplement mélangé [Vedettes matières IGN] Sylviculture Résumé : (auteur) The density and identity of tree neighbourhood is a key factor to explain tree mortality in forests, especially during the stem exclusion phase. $\bullet$ To understand this process, we built a logistic model for mortality in a spatially explicit context, including tree and neighbourhood predictors. Additionally, we used this model to build mortality risk frequency distributions. Finally, we tested this model against a random mortality model to predict the spatial pattern of the forest. $\bullet$ Annual mortality rate was high for pedunculate oak (Quercus robur, 6.99%), moderate for birch (Betula celtiberica, 2.19%) and Pyrenean oak (Q. pyrenaica, 1.58%) and low for beech (Fagus sylvatica, 0.26%). Mortality risk models for pedunculate oak and birch included stem diameter, tree height, canopy position and neighbourhood. Mortality was affected by the specific nature of the neighbourhood showing a clear competitive hierarchy: beech > pedunculate oak > birch. Models based on random mortality and logistic regression model were able to predict the spatial pattern of survivors although logistic regression predictions were more accurate. $\bullet$ Our study highlights how simple models such as the random mortality one may obscure much more complex spatial interactions. Numéro de notice : A2009-724 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1051/forest:2008074 Date de publication en ligne : 14/01/2009 En ligne : https://www.afs-journal.org/articles/forest/abs/2009/01/f08212/f08212.html Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=71763 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
IFN-DIR-P000294	PER	Revue	Nogent-sur-Vernisson	Salle périodiques	Exclu du prêt

Potential productivity of forested areas based on a biophysical model. A case study of a mountainous region in northern Spain / Raquel Benavides in Annals of Forest Science, Vol 66 n° 1 (January - February 2009)  

Public [article]  inAnnals of Forest Science > Vol 66 n° 1 (January - February 2009) . - n° 108 Titre : Potential productivity of forested areas based on a biophysical model. A case study of a mountainous region in northern Spain Titre original : Productivité potentielle des forêts à partir d'un modèle biophysique. Étude du cas d'une région montagneuse dans le nord de l'Espagne Type de document : Article/Communication Auteurs : Raquel Benavides, Auteur ; Sonia Roig, Auteur ; Koldo Osoro, Auteur Année de publication : 2009 Article en page(s) : n° 108 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] Espagne [Termes IGN] forêt alpestre [Termes IGN] géostatistique [Termes IGN] modèle mathématique [Termes IGN] système d'information géographique [Termes IGN] utilisation du sol [Vedettes matières IGN] Sylviculture Résumé : (auteur) Today's forest managers face a number of important challenges involving an increasing need for precise estimates of forest structure and biomass, potential productivity or forest growth. The objective is to develop a model for potential productivity in a mountainous region of Spain. The model combines climatic, topographic and lithological data using a variant of a traditional biophysical model: the Paterson index. • In a first approach, the climatic productivity is assessed by modelling the required parameters using different geostatistical techniques and software supported by GIS. A second approach includes the correction of the former productivity classes considering the different lithological facies. The potential forest productivity model involves the integration of both models. • Finally, data from the National Forest Inventory (NFI) are used to compare the real and potential yield data within different regions of the studied area. • The results of these analyses demonstrate the usefulness of the model, particularly in mountainous regions, where no significant differences are found between the data from the NFI and the model, but they also show the discrepancies between the estimates and real data when the latter are considered for different tree species, diameter classes or management. Numéro de notice : A2009-725 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1051/forest/2008080 Date de publication en ligne : 31/01/2009 En ligne : https://www.afs-journal.org/articles/forest/abs/2009/01/f08123/f08123.html Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=71766 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
IFN-DIR-P000294	PER	Revue	Nogent-sur-Vernisson	Salle périodiques	Exclu du prêt