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Climate-growth variability in Quercus ilex L. west Iberian open woodlands of different stand density / Dario Martín-Benito in Annals of Forest Science, Vol 66 n° 8 (December 2009)  

Public [article]  inAnnals of Forest Science > Vol 66 n° 8 (December 2009) . - n° 802 Titre : Climate-growth variability in Quercus ilex L. west Iberian open woodlands of different stand density Titre original : Variabilité des relations climat- croissance chez Quercus ilex L. dans des peuplements forestiers ouverts de différentes densités dans l'ouest de la péninsule Ibérique Type de document : Article/Communication Auteurs : Dario Martín-Benito, Auteur ; Paolo Cherubini, Auteur ; Isabel Canellas, Auteur Année de publication : 2009 Article en page(s) : n° 802 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] cerne [Termes IGN] dendroécologie [Termes IGN] Espagne [Termes IGN] Quercus ilex [Vedettes matières IGN] Végétation et changement climatique Résumé : (Auteur) We present the longest tree-ring chronology (141 y) of Quercus ilex L. (holm oak), and discuss the species climate-growth relationships and the influence of stand density on tree sensitivity to climate. Similarly to Quercus suber L., the most influential climatic variables upon holm oak growth were late spring and early summer precipitation, which enhanced growth, and high temperatures in the previous August and current July, which negatively affected growth. High density stands responded to similar climatic factors as low density stands, but their response was generally weaker. Holm oak sensitivity to climate has increased in recent decades, which might be related to increasing temperatures in the region. Sensitivity was higher in low density stands. Additionally, the effect of summer stress on growth seems to have increased during the same period, similarly to other species in the Iberian Peninsula, suggesting that trees are more vulnerable to climatic changes. Stand density could buffer the response to climate by smoothing climatic extremes. Nevertheless, the effect of competition might reverse this positive effect at the individual tree level. Precautions should be taken before providing management guidelines regarding the effect of climate change and stand density on holm oak. Numéro de notice : A2009-608 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1051/forest/2009080 Date de publication en ligne : 25/11/2009 En ligne : https://www.afs-journal.org/articles/forest/full_html/2009/08/f09112/f09112.html Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=72891 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
IFN-001-P000694	PER	Revue	Nogent-sur-Vernisson	Salle périodiques	Exclu du prêt

Measuring wood density by means of X-ray computer tomography / Charline Freyburger in Annals of Forest Science, Vol 66 n° 8 (December 2009)  

Public [article]  inAnnals of Forest Science > Vol 66 n° 8 (December 2009) . - n° 804 Titre : Measuring wood density by means of X-ray computer tomography Titre original : Mesure de la densité du bois par tomographie à rayons X Type de document : Article/Communication Auteurs : Charline Freyburger, Auteur ; Fleur Longuetaud, Auteur ; Frédéric Mothe, Auteur ; Thiéry Constant, Auteur ; Jean-Michel Leban , Auteur Année de publication : 2009 Article en page(s) : n° 804 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Végétation [Termes IGN] biomasse [Termes IGN] densité du bois [Termes IGN] étalonnage d'instrument [Termes IGN] puits de carbone [Termes IGN] rayon X [Termes IGN] tomographie Résumé : (Auteur) Wood density is a characteristic of major interest. Usually, it is used as an indicator of wood quality; however, in the context of global change, it is increasingly used for biomass and carbon storage estimations. X-ray computer tomography is a method which enables quick estimates of wood density after applying a calibration procedure. A review of the literature is presented in this article. Most of the previous studies have been performed in the 80’s or at the beginning of the 90’s. In this study, the relationship between wood density and Hounsfield numbers was investigated using a recent medical scanner. A linear relationship was fitted using a calibration data set which consisted in tropical wood samples representing a large range of densities ranging between 133 and 1319 kg m−3, and then validated using an independent data set (mainly temperate tree species). The fitted relationships were very strong (R2 > 0.999), whichever the tested scanner settings, with slight but significant effects of the current voltage and reconstruction filters. The RMSE values computed from the validation data set ranged between 5.4 and 7.7 kg m−3 for densities ranging between 364 and 821 kg m−3. In conclusion, this method of calibration enables the use of a medical scanner to obtain maps of wood density, in a fast and non destructive way, and with a very good accuracy. Very interesting perspectives are opened regarding biomass distribution within trees. Numéro de notice : A2009-610 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1051/forest/2009071 Date de publication en ligne : 25/11/2009 En ligne : https://www.afs-journal.org/articles/forest/full_html/2009/08/f09029/f09029.html Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=72893 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
IFN-001-P000694	PER	Revue	Nogent-sur-Vernisson	Salle périodiques	Exclu du prêt

A merchantable volume system for Pinus sylvestris L. in the major mountain ranges of Spain / Felipe Crecente-Campo in Annals of Forest Science, Vol 66 n° 8 (December 2009)  

Public [article]  inAnnals of Forest Science > Vol 66 n° 8 (December 2009) . - n° 808 Titre : A merchantable volume system for Pinus sylvestris L. in the major mountain ranges of Spain Titre original : Un modèle pour l'estimation du volume commercialisable du pin sylvestre dans les principales régions de montagne d'Espagne Type de document : Article/Communication Auteurs : Felipe Crecente-Campo, Auteur ; Alberto Rojo Alboreca, Auteur ; Ulises Diéguez-Aranda, Auteur Année de publication : 2009 Article en page(s) : n° 808 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] Espagne [Termes IGN] méthode des moindres carrés [Termes IGN] modèle mathématique [Termes IGN] montagne [Termes IGN] Pinus sylvestris [Termes IGN] volume en bois [Vedettes matières IGN] Economie forestière Résumé : (Auteur) Accurate estimation of stem volume makes it possible to estimate the monetary value of one of the many commodities and services that forests provide to society, i.e. timber. In the present study a compatible volume system for Scots pine in the major mountain ranges of Spain (the Pyrenees, Southern Iberian Range, Northern Iberian Range, Soria and Burgos Mountains, Central Range and Galician Mountains) was developed with data from 2682 destructively sampled trees. Several well-known taper functions were evaluated. A second-order continuous-time autoregressive error structure was used to correct the inherent autocorrelation in the hierarchical data, allowing the model to be applied to irregularly spaced and unbalanced data. The compatible segmented model of Fang et al. (2000) best described the experimental data. It is therefore recommended for estimating diameter at a specific height, height to a specific diameter, merchantable volume, and total volume for the six mountain ranges analyzed. • The non-linear extra sum of squares method indicated differences in mountain range-specific taper functions. A different taper function should therefore be used for each mountain range in Spain. Numéro de notice : A2009-614 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1051/forest/2009078 Date de publication en ligne : 25/11/2009 En ligne : https://www.afs-journal.org/articles/forest/full_html/2009/08/f09224/f09224.html Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=72897 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
IFN-001-P000694	PER	Revue	Nogent-sur-Vernisson	Salle périodiques	Exclu du prêt

Comparing floristic composition in treefall gaps of certified, conventionally managed and natural forests of northern Honduras / Mari Kukkonen in Annals of Forest Science, Vol 66 n° 8 (December 2009)  

Public [article]  inAnnals of Forest Science > Vol 66 n° 8 (December 2009) . - n° 809 Titre : Comparing floristic composition in treefall gaps of certified, conventionally managed and natural forests of northern Honduras Titre original : Comparaison de la composition floristique dans les trouées d'abattage d'arbres dans les forêts certifiées, conventionnellement gérées et naturelles du Nord du Honduras Type de document : Article/Communication Auteurs : Mari Kukkonen, Auteur ; Stefan Hohnwald, Auteur Année de publication : 2009 Article en page(s) : n° 809 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] certification forestière [Termes IGN] déboisement [Termes IGN] exploitation forestière [Termes IGN] flore forestière [Termes IGN] Honduras [Vedettes matières IGN] Sylviculture Résumé : (Auteur) Forest certification sets requirements for minimizing the impacts of logging on the natural structure and floristic composition of forests. We assessed the impact of certification by comparing the floristic composition of 52 taxa of trees and shrubs in the treefall gaps of certified, conventionally managed and protected forests in northern Honduras. The highest abundance of light-benefiting taxa was found in certified forests, whereas conventionally managed forests were floristically more similar to natural forests. The environmental conditions measured in certified gaps were not favourable for a natural forest floristic composition. Past logging may have altered the species composition in certified forests relatively more than in conventionally managed forests. This implies that the need for restoration operations should be considered in certification requirements, along with landscape-level planning to enhance post-logging recovery. Numéro de notice : A2009-615 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1051/forest/2009070 Date de publication en ligne : 25/11/2009 En ligne : https://www.afs-journal.org/articles/forest/full_html/2009/08/f09017/f09017.html Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=72898 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
IFN-001-P000694	PER	Revue	Nogent-sur-Vernisson	Salle périodiques	Exclu du prêt

Summer temperature affects the ratio of radial and height growth of Scots pine in northern Finland / Hannu Salminen in Annals of Forest Science, Vol 66 n° 8 (December 2009)  

Public [article]  inAnnals of Forest Science > Vol 66 n° 8 (December 2009) . - n° 810 Titre : Summer temperature affects the ratio of radial and height growth of Scots pine in northern Finland Titre original : Les températures estivales influent sur le rapport croissance en hauteur et croissance radiale chez le pin sylvestre dans le nord de la Finlande Type de document : Article/Communication Auteurs : Hannu Salminen, Auteur ; Risto Jalkanen, Auteur ; Markus Lindholm, Auteur Année de publication : 2009 Article en page(s) : n° 810 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] croissance des arbres [Termes IGN] dendrochronologie [Termes IGN] Finlande [Termes IGN] limite bioclimatique [Termes IGN] Pinus sylvestris [Termes IGN] température [Vedettes matières IGN] Sylviculture Résumé : (Auteur) Radial and height growth chronologies from 150-year-old and 50-year old Scots pine stands, both located near to the northern timberline in Laanila, Finland (68° 30′ N, 27° 28′ E), were cross-correlated with each other and with mean temperatures of various temperature periods defined as months, days or growing-degree-days. The height-growth chronology correlates significantly with radial growth at lags 1 and 2, and radial growth with height growth at lag 2 when the effect of temperature is omitted. On average, low and high growth years represent cool and warm average growing seasons. The summer temperatures (June, July and August) affect most on growth, but height and radial growth do have a different set of effective temperature periods. Furthermore, July temperature variation affects stronger height than radial growth. Those years with low height/radial-growth ratio, i.e. relatively higher current year’s radial than next year’s height growth, do have lower growth and cooler-than-average July temperature whereas those years with high height/radial-growth ratio do have clearly warmer mid-summer temperatures. Note de contenu : DOI: 10.1051/forest/2009074. Résumé en anglais et français. Bibliogr. Numéro de notice : A2009-616 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1051/forest/2009074 Date de publication en ligne : 25/11/2009 En ligne : https://www.afs-journal.org/articles/forest/full_html/2009/08/f09077/f09077.html Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=72899 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
IFN-001-P000694	PER	Revue	Nogent-sur-Vernisson	Salle périodiques	Exclu du prêt

A generic model of thinning and stand density effects on forest growth, mortality and net increment / Oskar Franklin in Annals of Forest Science, Vol 66 n° 8 (December 2009)  

Public [article]  inAnnals of Forest Science > Vol 66 n° 8 (December 2009) . - n° 815 Titre : A generic model of thinning and stand density effects on forest growth, mortality and net increment Titre original : Un modèle générique des effets de l'éclaircie et de la densité des peuplements sur la croissance des forêts, la mortalité et l'accroissement net Type de document : Article/Communication Auteurs : Oskar Franklin, Auteur ; Kentaro Aoki, Auteur ; Rupert Seidl, Auteur Année de publication : 2009 Article en page(s) : n° 815 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] bois mort [Termes IGN] densité de la végétation [Termes IGN] éclaircie (sylviculture) [Termes IGN] foresterie [Termes IGN] modèle de croissance végétale [Vedettes matières IGN] Sylviculture Résumé : (Auteur) For assessing forest thinning effects at large (i.e. continental) scale, data scarcity and technical limitations prevent the application of localized or individual-based thinning models. Here we present a simple general framework to analyze and predict the effects of thinning on growth and mortality, including the following stand density development. The effects are modeled in relative terms so that the model can be parameterized based on any thinning experiment that includes an un-thinned control, regardless of site conditions and stand age. The model was tested against observed thinning effects on growth and mortality from five temperate and boreal species (all species pooled r2 = 0.51). It predicted a maximum increase in net stem biomass increment of 16% and a reduction in density-related mortality of 75% compared to un-thinned conditions at stand densities of around 70% of the maximum (increment optimal density). A sensitivity analysis revealed overlapping ranges of near optimal density (net increment within 95% of optimal) among all tested species, suggesting that one thinning scenario can be used for many species. The simple and general formulation of thinning effects based on only five parameters allows easy integration with a wide range of generic forest growth models. Numéro de notice : A2009-621 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1051/forest/2009073 Date de publication en ligne : 25/11/2009 En ligne : https://doi.org/10.1051/forest/2009073 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=72904 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
IFN-001-P000694	PER	Revue	Nogent-sur-Vernisson	Salle périodiques	Exclu du prêt