Ajustement d'un modèle hauteur-circonférence pour l'épicéa commun. Effet de la densité

Deleuze, Christine; Blaudez, D; Hervé, JC

doi:10.1051/forest:19960107

Cited by 8 publications

(5 citation statements)

References 6 publications

(6 reference statements)

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“…For these groups, a local basal area G was calculated (sum of individual basal areas/sum of space available for each tree). In agreement with Deleuze et al [5] these data showed that dominant height Ho was not affected by density. Hence all densities were pooled together when computing dominant height for each plot.…”

Section: Vercel's Trialsupporting

confidence: 82%

A flexible radial increment model for individual trees in pure even-aged stands

Deleuze¹,

Pain²,

Dhôte³

et al. 2004

Ann. For. Sci.

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-To capture the common feature of various individual growth models for trees in pure and even-aged stands, a generic model with a form parameter according to each species is proposed. With a final objective of implementing this model into simulation software of silvicultural treatments, particular care was taken to structure the model for consistent behaviour outside the data fields of calibration and to limit the independent variables to those available to managers. The first analysis, using data from a young spruce stand, allowed introduction of simple variables (basal area and dominant height) to express competition effects. Then the model was fitted on a large data set to take into account silvicultural treatments and fertility conditions. Finally the model tested on spruce was directly adjusted for Douglas-fir and was found to be sufficiently flexible to describe growth of this species. This newly derived model is a relatively generic tool, which can be fitted for other species in regular stands.tree growth model / regular stand / silviculture / software / simulation / spruce / Douglas-fir Résumé -Un modèle générique de croissance radiale d'arbre en peuplements purs et réguliers. Un modèle générique de croissance de type arbre, pour des peuplements purs et réguliers, est proposé en utilisant les points communs de différents modèles de la littérature et en tenant compte à travers un paramètre des différentes formes observées selon les essences. L'utilisation de ce modèle étant une implémentation informatique dans un simulateur de sylviculture, sa forme a été contrainte pour un comportement robuste en dehors de la zone de validité, tandis que les variables directrices ont été choisies pour faciliter l'utilisation par des gestionnaires forestiers. La première étape basée sur un jeune peuplement clinal d'épicéa a permis d'introduire simplement l'effet de la compétition à l'aide de deux variables explicatives (surface terrière et hauteur dominante). L'utilisation d'un large réseau d'essais a ensuite permis de prendre en compte l'effet simultané de la sylviculture et de la fertilité. Enfin ce modèle a directement été ajusté sur une base de données de croissance de Douglas et s'est parfaitement adapté à une forme de croissance plus progressive. modèle de croissance d'arbre / peuplement régulier / sylviculture / logiciel / simulation / épicéa / Douglas

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Section: Vercel's Trialsupporting

confidence: 82%

A flexible radial increment model for individual trees in pure even-aged stands

Deleuze¹,

Pain²,

Dhôte³

et al. 2004

Ann. For. Sci.

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“…This ''first phase of growth' ' (1994-1996) is due to weak apical dominance under hormonal control (Cabanettes and Rapp, 1981a) and is influenced by ''planting crisis'' effects (Kremer and Roussel, 1986). Moreover, the relationship between height growth and radial growth variables evolves with seedling age (Lappi, 1997), and follows the two growth phases distinguished; it appears to discriminate the two Provençal provenances in the second phase of growth (1997)(1998)(1999) but not in the first one may change as competition among seedlings increases (Deleuze et al, 1996). These conclusions agree with the analyses of Beguin and Raulier (1995) and those of Cañadas Dias et al (2000).…”

Section: Comparison Of Provenancesmentioning

confidence: 96%

Dendrometry and morphometry of Pinus pinea L. in Lower Provence (France): adaptability and variability of provenances

Court-Picon

Gadbin-Henry

Guibal

et al. 2004

Forest Ecology and Management

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“…At the time of the study, and for some practical reasons, we had to sample in an experimental design described in [11][12][13][14] (pure and even-aged stand, controlled mating, continuous variation of stand density). Dreyfus [13] showed that this experimental design generated a very high variability of stem dimensions (Tab.…”

Section: Lorraine Treesmentioning

confidence: 99%

Relationships between stem size and branch basal diameter variability in Norway spruce (Picea abies (L.)�Karsten) from two regions of France

Loubère¹,

Saint‐André²,

Hervé³

et al. 2004

Ann. For. Sci.

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-Statistical relationships between branch basal diameter of living whorls, stem size (height and diameter at breast height) and stand parameters (stand age, site class) were analysed in Norway spruce. The first experimental sample used to calibrate a model consisted of 98 trees from young to old stands growing in Lorraine (Eastern part of France). Every second whorl branch basal diameter was measured and a regression model was established for the living branches. Basal diameter variance components were estimated by a non-linear mixed model analysis. Results confirmed the close statistical relationships between branch basal diameter, tree size and stand parameters, whereas covariance analysis revealed significant random fluctuations among whorls and trees. Every third whorl branch basal diameter of 36 Norway spruce trees growing naturally in Midi-Pyrénées was used for the second analysis. Applying the model to these trees showed a good stability of the statistical relationship between the two regions.branch diameter / Norway spruce / wood quality / Lorraine / Midi-Pyrénées Résumé -Relation entre la taille des tiges et le diamètre basal des branches pour l'épicéa commun (Picea abies (L.) Karsten) de deux régions de France. On a étudié la relation statistique entre le diamètre des branches verticillaires vivantes, la taille de la tige (hauteur et diamètre) et les mesures de peuplement (âge du peuplement, indice de fertilité), chez l'épicéa commun. Pour établir le modèle, 98 arbres ont été échantillonnés en Lorraine. Le diamètre des branches verticillaires a été mesuré tous les deux verticilles. Un modèle de régression a été mis au point. Les composantes de la variance du diamètre basal ont ensuite été estimées, par un modèle mixte non linéaire. On a confirmé pour les branches vertes la forte relation statistique entre le diamètre basal, la taille de la tige et les mesures de peuplement. Cependant, l'analyse de covariance a montré qu'il existait une variation aléatoire entre les verticilles et entre les arbres. Un échantillon de 36 arbres de Midi-Pyrénées, représentatif de la ressource dans cette région a été mesuré tous les trois verticilles. L'application du modèle aux données de Midi-Pyrénées a montré que la relation statistique pouvait être stable d'une région à l'autre. diamètre des branches / épicéa commun / qualité du bois / Lorraine / Midi-Pyrénées

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Ajustement d'un modèle hauteur-circonférence pour l'épicéa commun. Effet de la densité

Cited by 8 publications

References 6 publications

A flexible radial increment model for individual trees in pure even-aged stands

A flexible radial increment model for individual trees in pure even-aged stands

Dendrometry and morphometry of Pinus pinea L. in Lower Provence (France): adaptability and variability of provenances

Relationships between stem size and branch basal diameter variability in Norway spruce (Picea abies (L.)�Karsten) from two regions of France

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