Descripteur
Termes IGN > sciences naturelles > sciences de la vie > biologie > botanique > phytobiologie > densité du bois
densité du boisVoir aussi |
Documents disponibles dans cette catégorie (35)
Ajouter le résultat dans votre panier
Visionner les documents numériques
Affiner la recherche Interroger des sources externes
Etendre la recherche sur niveau(x) vers le bas
Measurement of the annual biomass increment of the French forests, XYLODENSMAP project [diaporama] / Jean-Michel Leban (2016)
Titre : Measurement of the annual biomass increment of the French forests, XYLODENSMAP project [diaporama] Type de document : Article/Communication Auteurs : Jean-Michel Leban , Auteur ; Jean-Christophe Hervé (1961-2017) , Auteur ; Jean-Daniel Bontemps , Auteur ; Fleur Longuetaud, Auteur ; Frédéric Mothe, Auteur ; Philippe Jacquin, Auteur Editeur : Saint-Mandé : Institut national de l'information géographique et forestière - IGN (2012-) Année de publication : 2016 Projets : XyloDensMap / Leban, Jean-Michel Conférence : IUFRO 2016, conference Modelling Wood Quality, Supply and Value Chain Networks-Wood 12/06/2016 18/06/2016 Québec Langues : Anglais (eng) Descripteur : [Termes IGN] arbre (flore)
[Termes IGN] base de données localisées
[Termes IGN] biomasse forestière
[Termes IGN] densité du bois
[Termes IGN] inventaire forestier national (données France)
[Termes IGN] puits de carbone
[Vedettes matières IGN] Végétation et changement climatiqueRésumé : (auteur) In the context of climatic change an increasing attention is paid to the ability of forests to store more carbon as increasing carbon sequestration by forests is equivalent to reducing emissions the release of carbon to the atmosphere. Estimating the quantity of carbon sequestered in the forests is usually based upon the National Forest Inventory statistical measurements. These measurements are converted in estimates of the annual forest increments that in turn are converted in annual biomass increments by the means of models and of average basic density values depending of the availability of wood density data bases. The wood density is very variable among species and is dependant of the annual rings anatomical structure (ring porous, semi-ring porous, diffuse porous, non-porous) and of the growth conditions of the trees (genetic origin, stand age and structure, management, and climate). These different sources of variability of the wood density are not yet taken into account for forests carbon accounting. The objective of this project is to measure the wood density variations on all the thirty thousand trees measured during one year by the technicians of the French National Forest Inventory. A new low cost method was developed for the processing of all the collected increment cores. The increments cores are stored in alveolar polycarbonate plates, dried and scanned with one medical Xray scanner. For each increment core the width of the last five rings was measured on the field and the corresponding wood density obtained by the scanner and a new informatics program. This method is tested for the first time in France and it will provide a new xylotheque and an original wood density data set for all the French tree species measured by the National Forest Inventory. We will present preliminary results for the new measurement proxy of the annual forest biomass increments, illustrate the perspective to analyze the biomass increments in relation with the forests stand structure and with the geographical climatic conditions and discuss the interest to measure on the same samples other wood properties than wood density. Numéro de notice : C2016-016 Affiliation des auteurs : LIF+Ext (2012-2019) Thématique : FORET Nature : Communication nature-HAL : ComSansActesPubliés-Unpublished DOI : sans Date de publication en ligne : 17/06/2017 En ligne : https://www.researchgate.net/publication/304037000_Measurement_of_the_annual_bio [...] Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=84600 Documents numériques
en open access
Measurement of the annual biomass increment of the French forestsAdobe Acrobat PDF Stand density, tree social status and water stress influence allocation in height and diameter growth of Quercus petraea (Liebl.) / Raphaël Trouvé in Tree Physiology, vol 35 n° 10 (October 2015)
[article]
Titre : Stand density, tree social status and water stress influence allocation in height and diameter growth of Quercus petraea (Liebl.) Type de document : Article/Communication Auteurs : Raphaël Trouvé, Auteur ; Jean-Daniel Bontemps , Auteur ; Ingrid Seynave, Auteur ; Catherine Collet, Auteur ; François Lebourgeois, Auteur Année de publication : 2015 Projets : ORACLE/Changements Environnementaux Planétaires & Sociétés (CEP&S) / Noblet-Ducoudré, Nathalie de Article en page(s) : pp 1035 - 1046 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Végétation
[Termes IGN] croissance des arbres
[Termes IGN] densité du bois
[Termes IGN] diamètre des arbres
[Termes IGN] hauteur des arbres
[Termes IGN] Quercus sessiliflora
[Termes IGN] stress hydriqueRésumé : (auteur) Even-aged forest stands are competitive communities where competition for light gives advantages to tall individuals, thereby inducing a race for height. These same individuals must however balance this competitive advantage with height-related mechanical and hydraulic risks. These phenomena may induce variations in height–diameter growth relationships, with primary dependences on stand density and tree social status as proxies for competition pressure and access to light, and on availability of local environmental resources, including water. We aimed to investigate the effects of stand density, tree social status and water stress on the individual height–circumference growth allocation (Δh–Δc), in even-aged stands of Quercus petraea Liebl. (sessile oak). Within-stand Δc was used as surrogate for tree social status. We used an original long-term experimental plot network, set up in the species production area in France, and designed to explore stand dynamics on a maximum density gradient. Growth allocation was modelled statistically by relating the shape of the Δh–Δc relationship to stand density, stand age and water deficit. The shape of the Δh–Δc relationship shifted from linear with a moderate slope in open-grown stands to concave saturating with an initial steep slope in closed stands. Maximum height growth was found to follow a typical mono-modal response to stand age. In open-grown stands, increasing summer soil water deficit was found to decrease height growth relative to radial growth, suggesting hydraulic constraints on height growth. A similar pattern was found in closed stands, the magnitude of the effect however lowering from suppressed to dominant trees. We highlight the high phenotypic plasticity of growth in sessile oak trees that further adapt their allocation scheme to their environment. Stand density and tree social status were major drivers of growth allocation variations, while water stress had a detrimental effect on height in the Δh–Δc allocation. Numéro de notice : A2015--082 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1093/treephys/tpv067 Date de publication en ligne : 31/07/2015 En ligne : https://doi.org/10.1093/treephys/tpv067 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=84567
in Tree Physiology > vol 35 n° 10 (October 2015) . - pp 1035 - 1046[article]Documents numériques
en open access
Stand density, tree social status ... - pdf éditeurAdobe Acrobat PDF When tree rings behave like foam : moderate historical decrease in the mean ring density of common beech paralleling a strong historical growth increase / Jean-Daniel Bontemps in Annals of Forest Science, Vol 70 n° 4 (June 2013)
[article]
Titre : When tree rings behave like foam : moderate historical decrease in the mean ring density of common beech paralleling a strong historical growth increase Type de document : Article/Communication Auteurs : Jean-Daniel Bontemps , Auteur ; Pierre Gelhaye, Auteur ; Gérard Nepveu, Auteur ; Jean-Christophe Hervé (1961-2017) , Auteur Année de publication : 2013 Article en page(s) : pp 329 - 343 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] analyse diachronique
[Termes IGN] croissance des arbres
[Termes IGN] dendrologie
[Termes IGN] dendrométrie
[Termes IGN] densité du bois
[Termes IGN] estimation statistique
[Termes IGN] Fagus sylvatica
[Termes IGN] puits de carbone
[Vedettes matières IGN] BotaniqueRésumé : (auteur) Context : While historical increases in forest growth have been largely documented, investigations on historical wood density changes remain anecdotic. They suggest possible density decreases in softwoods and ring-porous hardwoods, but are lacking for diffuse-porous hardwoods.
Aims : To evaluate the historical change in mean ring density of common beech, in a regional context where a ring-porous hardwood and a softwood have been studied, and assess the additional effect of past historical increases in radial growth (+50 % over 100 years), resulting from the existence of a positive ring size–density relationship in broadleaved species.
Methods : Seventy-four trees in 28 stands were sampled in Northeastern France to accurately separate developmental stage and historical signals in ring attributes. First, the historical change in mean ring density at 1.30 m (X-ray microdensitometry) was estimated statistically, at constant developmental stage and ring width. The effect of past growth increases was then added to assess the net historical change in wood density.
Results : A progressive centennial decrease in mean ring density of −55 kg m−3 (−7.5 %) was identified (−10 % following the most recent decline). The centennial growth increase induced a maximum +25 kg m−3 increase in mean ring density, whose net variation thus remained negative (−30 kg m−3).
Conclusions : This finding of a moderate but significant decrease in wood density that exceeds the effect of the positive growth change extends earlier reports obtained on other wood patterns in a same regional context and elsewhere. Despite their origin not being understood, such decreases hence form an issue for forest carbon accounting.Numéro de notice : A2013-828 Affiliation des auteurs : LIF+Ext (2012-2019) Thématique : FORET Nature : Article DOI : 10.1007/s13595-013-0263-2 Date de publication en ligne : 21/02/2013 En ligne : https://doi.org/10.1007/s13595-013-0263-2 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=83727
in Annals of Forest Science > Vol 70 n° 4 (June 2013) . - pp 329 - 343[article]Measuring wood density by means of X-ray computer tomography / Charline Freyburger in Annals of Forest Science, Vol 66 n° 8 (December 2009)
[article]
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] tomographieRésumé : (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
in Annals of Forest Science > Vol 66 n° 8 (December 2009) . - n° 804[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité IFN-001-P000694 PER Revue Nogent-sur-Vernisson Salle périodiques Exclu du prêt Comparing volume growth in pure and mixed stands of Pinus sylvestris and Quercus pyrenaica / Miren del Río in Annals of Forest Science, Vol 66 n° 5 (July - August 2009)
[article]
Titre : Comparing volume growth in pure and mixed stands of Pinus sylvestris and Quercus pyrenaica Titre original : Comparaison de la croissance en volume dans des peuplements purs et des peuplements mixtes de Pinus sylvestris et de Quercus pyrenaica Type de document : Article/Communication Auteurs : Miren del Río, Auteur ; Miren del Río, Auteur ; Hubert Sterba, Auteur Année de publication : 2009 Article en page(s) : n° 502 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] analyse comparative
[Termes IGN] croissance des arbres
[Termes IGN] densité du bois
[Termes IGN] forêt méditerranéenne
[Termes IGN] peuplement mélangé
[Termes IGN] Pinus sylvestris
[Termes IGN] Quercus pyrenaica
[Termes IGN] volume en bois
[Vedettes matières IGN] SylvicultureRésumé : (auteur) In Mediterranean forestry, it is important to improve knowledge about mixed stands dynamics, including their productivity. Previous studies have focused on the interactions between different species (competition, reduction of competition and facilitation) depending on site, species composition and structure. At the centre of this research are the possible differences between pure and mixed stands of Pinus sylvestris and Quercus pyrenaica in terms of density-growth relationships and volume growth per species. Using data from the second and third Spanish National Forest Inventory (606 plots), volume increment models for these species were fitted. Both species displayed a similar density-growth pattern for pure and mixed stands, with a maximum volume growth at maximum density. Volume increment per occupied area was also found to be greater in mixed stands as opposed to pure stands, suggesting a species interaction with reduced levels of competition in the former. However, the total volume growth was generally lower in mixed stands since the growth rate of oak is much lower.
The results highlight the expedience of favouring P. sylvestris-Q. pyrenaica mixed stands with higher proportions of pine trees in order to gain the benefits of a more complex forest whilst retaining an acceptable level of wood production.Numéro de notice : A2009-636 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1051/forest/2009035 Date de publication en ligne : 09/07/2009 En ligne : https://www.afs-journal.org/articles/forest/full_html/2009/05/f08293/f08293.html Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=72460
in Annals of Forest Science > Vol 66 n° 5 (July - August 2009) . - n° 502[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité IFN-001-P000455 PER Revue Nogent-sur-Vernisson Salle périodiques Exclu du prêt High resolution temporal variation in wood properties in irrigated and non-irrigated Eucalyptus globulus / David M. Drew in Annals of Forest Science, Vol 66 n° 4 (June 2009)Permalink