Modélisation de la croissance des peuplements réguliers de hêtre : dynamique des hiérarchies sociales et facteurs de production

Dhôte, JF

doi:10.1051/forest:19910404

Cited by 23 publications

(13 citation statements)

References 8 publications

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“…Indeed if data is related to periods between 3 and 7 years, facility in using simulation software can quickly lead to annual reiterations of the model, or on the contrary to very large increment simulations (more than 10 years). As already studied by Dhôte [8], period length does not have a strong effect, except outside the data framework, i.e. for increments less than 3 years or more than 7 years.…”

Section: Discussionmentioning

confidence: 83%

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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: Discussionmentioning

confidence: 83%

“…Dhôte [7,8] proposed a segmented linear model between individual basal area increment and initial circumference at breast height (initially for beech, then for oak). It has an initial part of null growth for understorey trees and an increasing growth part for main vegetation storey trees.…”

Section: State Of the Artmentioning

confidence: 99%

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 interval indicates a rather conservative silviculture; previous work has shown that, for a given age, stand basal area or dominant height growth rates are almost independent on density, in this range of densities (Dhôte, 1991 The estimation procedure is a modification of that used by Dhôte and de Hercé (1994 (Dhôte, 1992 Although there is no single total volume yield-height relationship for all the forests (see Assmann, 1955) and although total yield may vary at a given height when site index varies (coherent with Kennel, 1973) This expression is a conventional balance between a positive term, which is proportional to dominant height, and a negative term proportional to the square power of height. This looks very much like the carbon-balance models, where the positive term represents the allocation of photosynthates to stem and branch growth and the negative term the losses of carbon due to mortality and maintenance respiration (Linder et al, 1985;Valentine, 1985;Mäkelä, 1986 Kira, 1975, cited by Cannell, 1989;Yokoi et al, 1978;Frossard and Lacointe, 1991).…”

Section: Objectives Of This Studymentioning

confidence: 99%

“…This study on productivity is part of a larger project aimed at modeling growth of pure even-aged stands of common beech, on the basis of a network of permanent plots observed since the turn of the century (Dhôte, 1991 Germany (Schober, 1972) and at the data discussed by Kennel (1973) revealed that none of these 2 sources verified Eichhorn's rule (Dhôte, 1992 Arbonnier (1958), Pardé (1962Pardé ( , 1981 and Oswald and Divoux (1981).…”

Section: Objectives Of This Studymentioning

confidence: 99%

A model of even-aged beech stands productivity with process-based interpretations

Dhôte

1996

Ann. For. Sci.

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“…The model was designed in the 1990s [25,26] and was largely described by Le Moguédec and Dhôte [27]. In brief, the model uses a top-down approach to predict forest growth over three-year growth intervals.…”

Section: Growth Modelmentioning

confidence: 99%

The Impact of Windstorm Damage in the Assessment of the Carbon Balance in Even-Aged Fagus sylvatica L. Stands

Fortin

Albrecht²,

Kohnle³

et al. 2014

Forests

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Due to the fact that forest ecosystems can potentially mitigate the impact of climate change, the carbon balance of managed forests has caught the attention of a large scientific community. Some authors conclude that extending rotation lengths would actually favour the climate change mitigation effect since more carbon would be stored in the biomass on the average. However, when the occurrence of catastrophic disturbances such as windstorms is not considered, the advantage of extending the rotation length might be overestimated for some species. In this study, we addressed this issue by coupling a growth model, a windstorm damage model and a carbon assessment tool. The evolution of an even-aged European beech (Fagus sylvatica L.) stand was simulated under three different rotation lengths. Simulations including stochastic windstorm events were run and compared with deterministic simulations with no catastrophic disturbance. Our results indicate that when disturbances caused by storms were not taken into account, the carbon balance was actually overestimated in some cases and that this overestimation increased with the rotation length. In our case study, omitting windstorm damage resulted in an overestimation as large as 8% for the longer rotation length. Nevertheless, when windstorm damage was taken into account in the simulation, the longer rotation length still stored more carbon on the average than shorter rotation lengths. However, the marginal gain in carbon storage induced by the increase of the rotation length was reduced.

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Modélisation de la croissance des peuplements réguliers de hêtre : dynamique des hiérarchies sociales et facteurs de production

Cited by 23 publications

References 8 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

A model of even-aged beech stands productivity with process-based interpretations

The Impact of Windstorm Damage in the Assessment of the Carbon Balance in Even-Aged Fagus sylvatica L. Stands

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