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Termes IGN > sciences naturelles > sciences de la vie > biologie > biométrie
biométrie
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biologie quantitative, biostatistique, statistique biologique. biologie, statistique. >> biomathématique. échantillonnage (statistique), statistique mathématique. >>Terme(s) spécifique(s) : analyse de survie (biométrie), génétique quantitative. Equiv. LCSH : Biometry. Domaine(s) : 510, 570. Voir aussi |
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A non-asymptotic sigmoid growth curve for top height growth in forest stands / Jean-Daniel Bontemps in Forestry, an international journal of forest research, vol 85 n° 3 (July 2012)
[article]
Titre : A non-asymptotic sigmoid growth curve for top height growth in forest stands Type de document : Article/Communication Auteurs : Jean-Daniel Bontemps , Auteur ; Pierre Duplat, Auteur Année de publication : 2012 Article en page(s) : pp 353 - 368 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Statistiques
[Termes IGN] courbe
[Termes IGN] croissance des arbres
[Termes IGN] hauteur des arbres
[Termes IGN] modèle de croissance végétale
[Termes IGN] modélisation de la forêt
[Termes IGN] peuplement forestierRésumé : (Auteur) Since the height horizon remains undetected in the vast majority of height series sampled in forest stands, even of notable ages, the realism of the traditional asymptotic-size modelling assumption is questioned. The aims of the study were to present an original non-asymptotic growth model and to test its accuracy against asymptotic-size equations. The equation proposed is a first-order four-parameter autonomous differential equation. The related sigmoid size curve has a parabolic branch of time. It was tested on 349 old growth series of top height (1047 stem analyses) selected to explore the maximum observed ranges of age and site conditions in seven temperate tree species growing in pure and even-aged stands. The fitting accuracy of this equation and three classical asymptotic-size growth equations (Richards, Hossfeld IV and Korf equations) were compared, with parameterizations of increasing flexibility. For the different parameterizations, the proposed growth equation showed higher performances than asymptotic growth equations, attributed to its non-asymptotic property and to the mathematical independence between parameters related to the inflection point and late growth. Top height growth was therefore accurately modelled by a sigmoid curve not based on the asymptotic-size assumption. This equation may be of general relevance to tree growth modelling. Numéro de notice : A2012-732 Affiliation des auteurs : non IGN Thématique : FORET/MATHEMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1093/forestry/cps034 Date de publication en ligne : 11/04/2012 En ligne : https://doi.org/10.1093/forestry/cps034 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91172
in Forestry, an international journal of forest research > vol 85 n° 3 (July 2012) . - pp 353 - 368[article]Tracking human impact on current tree species distribution using plant communities / Daniel E. Silva in Journal of vegetation science, vol 23 n° 2 (April 2012)
[article]
Titre : Tracking human impact on current tree species distribution using plant communities Type de document : Article/Communication Auteurs : Daniel E. Silva, Auteur ; Vincent Badeau, Auteur ; Myriam Legay, Auteur ; Emmanuel Corcket, Auteur ; Jean-Luc Dupouey, Auteur Année de publication : 2012 Article en page(s) : pp 313 - 324 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] aire de répartition
[Termes IGN] anthropisation
[Termes IGN] Fagus sylvatica
[Termes IGN] inventaire forestier national (données France)
[Termes IGN] marge
[Termes IGN] modélisation de la forêt
[Termes IGN] phytosociologie
[Termes IGN] plaine
[Termes IGN] régression logistique
[Vedettes matières IGN] Végétation et changement climatiqueRésumé : (auteur) Questions : Can we adequately model beech distribution based on accompanying vegetation, and how does this compare with a climate model? To what extent does accompanying vegetation predict larger extension of beech at its SW margin compared with current distribution? Do human factors explain the discrepancy between current and potential distribution?
Location : Lowland forests at the SW European range margin of beech.
Methods : We built a logistic regression model of beech presence based on accompanying understorey vegetation using 66 976 plots in the French National Forest Inventory (NFI) network. Explanatory variables were obtained by multivariate reduction of 252 species in NFI plots. The model was calibrated in regions where human impact on beech has been comparatively low. The probability of beech presence was estimated at its SW margin and compared with current distribution. We tested whether forest management factors could explain beech absence in locations where the flora predicted its presence. Performance of this model was compared with a classical climatic-envelope model.
Results : Modelled potential distribution of beech along its SW margin was larger than observed distribution, suggesting area shrinkage under man's influence. Sites where beech was predicted as present but was currently absent were significantly less common in high forest stands, and more common in coppices, plantations and private forests. Characteristics of species replacing beech (early-successional, plantation or exotic species) confirmed the role of forest management and disturbance in beech disappearance. The floristic model provided a finer resolution distribution map than the climatic-envelope model.
Conclusions : Plant communities, together with precise tree species maps, allowed us to estimate manipulation of beech by man, and main silvicultural causes of its disappearance. The improvement in quality of current distribution models has important implications for modelling of niches under future climate scenarios.Numéro de notice : A2012-726 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1111/j.1654-1103.2011.01341.x En ligne : http://doi.org/10.1111/j.1654-1103.2011.01341.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=87074
in Journal of vegetation science > vol 23 n° 2 (April 2012) . - pp 313 - 324[article]Modelling forest management within a global vegetation model - Part 2: Model validation from a tree to a continental scale / V. Bellassen in Ecological modelling, vol 222 n° 1 (janvier 10, 2011)
[article]
Titre : Modelling forest management within a global vegetation model - Part 2: Model validation from a tree to a continental scale Type de document : Article/Communication Auteurs : V. Bellassen, Auteur ; G. Le Maire, Auteur ; O. Guin, Auteur ; Jean-François Dhôte, Auteur ; Philippe Ciais, Auteur ; Nicolas Viovy, Auteur Année de publication : 2011 Article en page(s) : pp 57 - 75 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] biomasse forestière
[Termes IGN] carbone
[Termes IGN] modélisation de la forêt
[Termes IGN] stress hydriqueMots-clés libres : ORCHIDEE-FM Résumé : (auteur) The construction of a new forest management module (FMM) within the ORCHIDEE global vegetation model (GVM) allows a realistic simulation of biomass changes during the life cycle of a forest, which makes many biomass datasets suitable as validation data for the coupled ORCHIDEE-FM GVM. This study uses three datasets to validate ORCHIDEE-FM at different temporal and spatial scales: permanent monitoring plots, yield tables, and the French national inventory data. The last dataset has sufficient geospatial coverage to allow a novel type of validation: inventory plots can be used to produce continuous maps that can be compared to continuous simulations for regional trends in standing volumes and volume increments. ORCHIDEE-FM performs better than simple statistical models for stand-level variables, which include tree density, basal area, standing volume, average circumference and height, when management intensity and initial conditions are known: model efficiency is improved by an average of 0.11, and its average bias does not exceed 25%. The performance of the model is less satisfying for tree-level variables, including extreme circumferences, tree circumference distribution and competition indices, or when management and initial conditions are unknown. At the regional level, when climate forcing is accurate for precipitation, ORCHIDEE-FM is able to reproduce most productivity patterns in France, such as the local lows of needleleaves in the Parisian basin and of broadleaves in south-central France. The simulation of water stress effects on biomass in the Mediterranean region, however, remains problematic, as does the simulation of the wood increment for coniferous trees. These pitfalls pertain to the general ORCHIDEE model rather than to the FMM. Overall, with an average bias seldom exceeding 40%, the performance of ORCHIDEE-FM is deemed reliable to use it as a new modelling tool in the study of the effects of interactions between forest management and climate on biomass stocks of forests across a range of scales from plot to country. Numéro de notice : A2011-285 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1016/j.ecolmodel.2010.08.038 Date de publication en ligne : 22/10/2010 En ligne : https://doi.org/10.1016/j.ecolmodel.2010.08.038 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102459
in Ecological modelling > vol 222 n° 1 (janvier 10, 2011) . - pp 57 - 75[article]Modelling forest management within a global vegetation model - Part 1: Model structure and general behaviour / V. Bellassen in Ecological modelling, vol 221 n° 20 (octobre 2010)
[article]
Titre : Modelling forest management within a global vegetation model - Part 1: Model structure and general behaviour Type de document : Article/Communication Auteurs : V. Bellassen, Auteur ; G. Le Maire, Auteur ; Jean-François Dhôte, Auteur ; Philippe Ciais, Auteur ; Nicolas Viovy, Auteur Année de publication : 2010 Article en page(s) : pp 2458 - 2474 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] biomasse forestière
[Termes IGN] carbone
[Termes IGN] feuillu
[Termes IGN] modèle de simulation
[Termes IGN] modélisation de la forêt
[Termes IGN] production primaire netteMots-clés libres : ORCHIDEE Résumé : (auteur) This article describes a new forest management module (FMM) that explicitly simulates forest stand growth and management within a process-based global vegetation model (GVM) called ORCHIDEE. The net primary productivity simulated by ORCHIDEE is used as an input to the FMM. The FMM then calculates stand and management characteristics such as stand density, tree size distribution, tree growth, the timing and intensity of thinnings and clear-cuts, wood extraction and litter generated after thinning. Some of these variables are then fed back to ORCHIDEE. These computations are made possible with a distribution-based modelling of individual tree size. The model derives natural mortality from the relative density index (rdi), a competition index based on tree size and stand density. Based on the common forestry management principle of avoiding natural mortality, a set of rules is defined to calculate the recurrent intensity and frequency of forestry operations during the stand lifetime. The new-coupled model is called ORCHIDEE-FM (forest management). The general behaviour of ORCHIDEE-FM is analysed for a broadleaf forest in north-eastern France. Flux simulation throughout a forest rotation compare well with the literature values, both in absolute values and dynamics. Results from ORCHIDEE-FM highlight the impact of forest management on ecosystem C-cycling, both in terms of carbon fluxes and stocks. In particular, the average net ecosystem productivity (NEP) of 225 gC m−2 year−1 is close to the biome average of 311 gC m−2 year−1. The NEP of the “unmanaged” case is 40% lower, leading us to conclude that management explains 40% of the cumulated carbon sink over 150 years. A sensitivity analysis reveals 4 major avenues for improvement: a better determination of initial conditions, an improved allocation scheme to explain age-related decline in productivity, and an increased specificity of both the self-thinning curve and the biomass-diameter allometry. Numéro de notice : A2010-686 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1016/j.ecolmodel.2010.07.008 Date de publication en ligne : 20/08/2010 En ligne : https://doi.org/10.1016/j.ecolmodel.2010.07.008 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102452
in Ecological modelling > vol 221 n° 20 (octobre 2010) . - pp 2458 - 2474[article]Recent changes in forest productivity: An analysis of national forest inventory data for common beech (Fagus sylvatica L.) in north-eastern France / Marie Charru in Forest ecology and management, vol 260 n° 5 (30 July 2010)
[article]
Titre : Recent changes in forest productivity: An analysis of national forest inventory data for common beech (Fagus sylvatica L.) in north-eastern France Type de document : Article/Communication Auteurs : Marie Charru, Auteur ; Ingrid Seynave, Auteur ; François Morneau , Auteur ; Jean-Daniel Bontemps , Auteur Année de publication : 2010 Article en page(s) : pp 864 - 874 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] analyse diachronique
[Termes IGN] croissance des arbres
[Termes IGN] Fagus sylvatica
[Termes IGN] inventaire forestier national (données France)
[Termes IGN] modèle de croissance végétale
[Termes IGN] productivité
[Termes IGN] régression
[Termes IGN] sécheresse
[Termes IGN] stress hydrique
[Termes IGN] surface terrière
[Vedettes matières IGN] Végétation et changement climatiqueRésumé : (auteur) Changes in forest growth have been found in European forests and worldwide. However most observations have been derived from samples of restricted size, whose representativeness at a regional forest scale is questionable. National forest inventories provide an interesting perspective for both regional scale assessment of these trends and the investigation of their variations over environmental gradients, but have been little used.
The aim of our work was to carry out an exploratory modelling analysis of productivity changes, based on the French national forest inventory data. The objectives were: (i) to assess recent trends in forest productivity and to investigate a possible recent decline as found in previous studies; and (ii) to investigate trend variations relative to site fertility factors. We focused on pure and even-aged stands of common beech (Fagus sylvatica L.) in north-eastern France, already documented from previous studies based on retrospective data.
The dataset consisted of 925 temporary plots inventoried between 1979 and 2007. We developed two regression models of stand basal area increment (BAI) against stand developmental stage (dominant height), site fertility (site index in the SI model, environmental indicators in the EI model) and stand density (relative density index). The effect of calendar date was tested in order to investigate possible historical trends. Site fertility–date interactions were also tested to investigate the site-dependence of trends.
The fitted models showed a high goodness of fit (adj. R2 over 0.69). We showed an increase in stand BAI of 27.8% between 1977 and 1987, (10.4% between 1979 and 1987). Stand BAI then decreased by approximately 5% between 1987 and 2004. We thus confirmed the hypothesis of a recent decline in common beech vitality in its temperate range. The chronologies clearly depicted the effect of severe drought events (1976 and 2003), pointing out the predominant role of water availability in the changes observed. No significant site-dependence of the trend was identified.Numéro de notice : A2010-648 Affiliation des auteurs : IFN+Ext (1958-2011) Thématique : FORET Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.foreco.2010.06.005 Date de publication en ligne : 07/07/2010 En ligne : https://doi.org/10.1016/j.foreco.2010.06.005 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90993
in Forest ecology and management > vol 260 n° 5 (30 July 2010) . - pp 864 - 874[article]Comment estimer la lumière dans le sous-bois forestier à partir des caractéristiques dendrométriques des peuplements ? / Philippe Balandier ; André Marquier ; Sandrine Perret ; Catherine Collet ; Benoît Courbaud in Rendez-vous techniques, n° 27-28 (hiver - printemps 2010)PermalinkModélisation de la croissance des peuplements mélangés chêne-pin : des enseignements importants pour la sylviculture de ces peuplements / Christine Micheneau ; Christine Deleuze-Brezins ; Jean-François Dhôte ; Myriam Legay in Rendez-vous techniques, n° 27-28 (hiver - printemps 2010)PermalinkA 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)PermalinkTree diameter, height and stocking in even-aged forests / Jerome K. Vanclay in Annals of Forest Science, Vol 66 n° 7 (October - November 2009)PermalinkUsing cover measurements to estimate aboveground understorey biomass in Maritime pine stands / Annabel J. Porté in Annals of Forest Science, Vol 66 n° 3 (April - May 2009)PermalinkBiomass component equations for Latin American species and groups of species / José Návar in Annals of Forest Science, Vol 66 n° 2 (march 2009)PermalinkA new bioclimatic model calibrated with vegetation for Mediterranean forest areas / Michel Vennetier in Annals of Forest Science, Vol 65 n° 7 (October - November 2008)PermalinkQuels modèles de croissance pour les peuplements mélangés ? Exemple du mélange Chêne sessile - Pin sylvestre / Thomas Pérot in Revue forestière française, vol 60 n° 2 (mars - avril 2008)PermalinkAires potentielles de répartition des essences forestières d'ici 2100 / Vincent Badeau in Rendez-vous techniques, Hors-série n° 3 (décembre 2007)PermalinkPrévoir la croissance et la production du Pin sylvestre : le module Sylvestris sous Capsis 4 / Thomas Pérot in Revue forestière française, vol 59 n° 1 (janvier - février 2007)PermalinkNear infrared photography for craniofacial anthropometric landmark measurement / A.K. Chong in Photogrammetric record, vol 21 n° 113 (March - May 2006)PermalinkSécurité des systèmes d'information / Ludovic Mé (2006)PermalinkRemote sensing in BOREAS [BOReal Ecosystem Atmosphere Study]: Lessons learned / John A. Gamon in Remote sensing of environment, vol 89 n° 2 (30/01/2004)PermalinkAssessment of regional forest and scrub productivity using a coupled vegetation process model with remote sensing / Nicholas C. Coops in Geocarto international, vol 17 n° 4 (December 2002 - February 2003)PermalinkAdvances in environmental and ecological modelling / François Blasco (1999)PermalinkConcepts et caractéristiques des divers modèles de croissance / Jean Bouchon in Revue forestière française, vol 47 (1995 - 01- 01)PermalinkQuelques nouveaux modèles morphométriques et leur utilisation en biométrie automatisée par ordinateur / Jean-Paul Rigaut (1984)PermalinkEstimation of variance and covariance components in the mixed model / Walter R. Harvey in Biometrics, vol 26 n° 3 (September 1970)PermalinkGeneralized distance and discrete variables / T. W. Kurczynski in Biometrics, vol 26 n° 3 (September 1970)PermalinkLarge sample variances of maximum likelihood estimators of variance components using unbalanced data / S. R. Searle in Biometrics, vol 26 n° 3 (September 1970)Permalink