ECOPHYS: An ecophysiological growth process model for juvenile poplar

Rauscher, H. Michael; Isebrands, J. G.; Host, George E; Dickson, Richard E.; Dickmann, Donald I.; Crow, Thomas R.; Michael, D. A.

doi:10.1093/treephys/7.1-2-3-4.255

Cited by 99 publications

(55 citation statements)

References 25 publications

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“…The models ECOPHYS [82] and SIMWAL [21] incorporate a very detailed PBM into a 3D structural description. They simulate the structural dynamics of poplar and walnut trees, respectively, at a fine temporal resolution (time step is a fraction of day).…”

Section: Models Utilizing Process-based Relationshipsmentioning

confidence: 99%

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Components of functional-structural tree models

Sievänen¹,

et al. 2000

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-We analyze functional-structural tree models (FMSs) that are an outgrowth of developments in process-based models (PBMs) on the one hand, and morphological models on the other. Existing morphological and functional-structural models are briefly reviewed. We introduce the idealized elementary unit (IEU) that can be used as the basic component of a FSM, and pinpoint the processes that have to be accounted for. The distribution of metabolites and growth is identified as one of the main focal points to be investigated in conjunction with FSMs, and the different approaches that can be applied in constructing the model component for this process are presented. Finally, we analyze the computational requirements of FSMs, discuss the challenges they pose, and assess their applicability in a number of different tasks. functional-structural model / process-based model / morphological model / tree structure / L-system Résumé -Les composants des modèles fonctionnels et structuraux des arbres. Cet article a pour objet de faire une synthèse des approches réalisées dans le cadre de la modélisation fonctionnelle et structurale des arbres (FSM). Ces modèles résultent du couplage entre la modélisation du fonctionnement écophysiologique d'arbres, d'une part, et la modélisation des processus morphologiques, d'autre part. Après une brève présentation des approches existantes, nous introduisons la notion « d'unité élémentaire idéale » (IEU) qui peut être considérée comme la composante fondamentale des FSM au regard de la souplesse qu'elle confère dans l'articulation des processus. La distribution des métabolites et la croissance sont ensuite abordées comme étant les processus à résoudre de façon prioritaire dans le développement des FSM, et les différentes approches pouvant être mises à contribution dans la construction de ces modèles sont discutées. Enfin nous analysons les besoins en programmation des FSM, discutons des avancées nécessaires et évaluons leur adéquation à la résolution d'objectifs divers. modèle fonctionnel-structural / modèle de fonctionnement / modèle morphologique / structure des arbres / L-system

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Section: Models Utilizing Process-based Relationshipsmentioning

confidence: 99%

“…For example, the gas exchange of each leaf or growth segment can be estimated as a function of the micro environment of the IEU, and the results can summed up over the whole tree to estimate gas exchange at the tree level [40,71,78,82]. Also the aging-associated changes [70] are easy to take into account.…”

Section: An Elementary Unit and Its Processesmentioning

confidence: 99%

Components of functional-structural tree models

Sievänen¹,

et al. 2000

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“…Submodels of light interception may range from simple to complex: LIGNUM [109] uses a modified Beer's law where PAR attenuation is computed from the biomass above each location. In contrast, ECOPHYS [113] includes light calculations based on virtual plants. This was made possible because ECOPHYS deals with young trees, i.e.…”

Section: Current Representations Of Tree Foliage/environment Interactmentioning

confidence: 99%

Short term interactions between tree foliage and the aerial environment: An overview of modelling approaches available for tree structure-function models

Sinoquet

Roux

2000

Ann. For. Sci.

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-Functional-structural tree models represent tree/aboveground environment interactions. Actually, plant architecture and function induce large variations in environmental variables within the canopy, while these variations themselves induce a range of responses at the organ scale which modulate plant function and architecture dynamics. This paper gives an overview of (i) processes involved in the short-term interactions between the tree foliage and the aboveground environment and (ii) associated modelling approaches. Then, it is shown that detailed models of tree foliage/aboveground environment interactions can be used to test simplifying assumptions such as the constancy of light or water use efficiency recently used in several functional-structural tree models. We conclude that a good knowledge of basic processes involved in these short-term interactions is available. The point is now to compare models focusing on tree-atmosphere exchanges, and to use these models to test assumptions and derive summary submodels for tree functional-structural models.microclimate / radiation / wind / photosynthesis / transpiration / acclimation / modelling / integration Résumé -Interactions à court terme entre le feuillage de l'arbre et son environnement aérien : une revue des approches de modélisation disponibles pour les modèles d'arbre structure-fonction. Les modèles d'arbres structure -fonction représentent les interactions entre l'arbre et son environnement aérien. En effet, la présence et le fonctionnement de la plante induisent de grandes variations des variables climatiques dans le couvert, et ces variations du microclimat peuvent elles mêmes moduler les réponses de la plante à l'échelle de l'organe (et donc son fonctionnement et son développement). Cet article présente une revue critique des méca-nismes impliqués à court terme dans les interactions entre le feuillage de l'arbre et son environnement microclimatique, ainsi que les approches proposées pour leur modélisation. Il est ensuite montré que des modèles détaillant les interactions entre l'arbre et son environnement aérien peuvent servir à tester des hypothèses simplificatrices du fonctionnement de l'arbre, comme la constance de l'efficience d'utilisation de la lumière ou de l'eau. Nous concluons que les processus impliqués dans ces interactions sont assez bien connus. Il faut maintenant comparer les modèles de simulation des échanges plante-atmosphère, et développer des modèles simples qui puissent être intégrés dans les modèles dynamiques structure-fonction.

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“…The water cycle includes transpiration, interception, soil evaporation, drainage and runoff. All these processes are explicitly represented in MAIDEN (Misson, 2004), but also in various models such as VS (Fritts et al, 1991), CASTANEA Dufrene et al, 2005), ECOPHYS (Rauscher et al, 1990) or SIMFORG (Berninger and Nikinmaa, 1997). The final output of these models is generally tree productivity but other physiological proxies such as those reflected by cellulose isotopic composition are also simulated by some of these models (column 6 in Table 1, Panek and Waring, 1997;Ogee et al, 2009;Eglin et al, 2010;Danis et al, 2012).…”

Section: Tree-growth Process Modelsmentioning

confidence: 99%

Process models and model-data fusion in dendroecology

2014

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Dendrochronology (i.e., the study of annually dated tree-ring time series) has proved to be a powerful technique to understand tree-growth. This paper intends to show the interest of using ecophysiological modeling not only to understand and predict tree-growth (dendroecology) but also to reconstruct past climates (dendroclimatology). Process models have been used for several decades in dendroclimatology, but it is only recently that methods of model-data fusion have led to significant progress in modeling tree-growth as a function of climate and in reconstructing past climates. These model-data fusion (MDF) methods, mainly based on the Bayesian paradigm, have been shown to be powerful for both model calibration and model inversion. After a rapid survey of tree-growth modeling, we illustrate MDF with examples based on series of Southern France Aleppo pines and Central France oaks. These examples show that if plants experienced CO 2 fertilization, this would have a significant effect on tree-growth which in turn would bias the climate reconstructions. This bias could be extended to other environmental non-climatic factors directly or indirectly affecting annual ring formation and not taken into account in classical empirical models, which supports the use of more complex process-based models. Finally, we conclude by showing the interest of the data assimilation methods applied in climatology to produce climate re-analyses.

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ECOPHYS: An ecophysiological growth process model for juvenile poplar

Cited by 99 publications

References 25 publications

Components of functional-structural tree models

Components of functional-structural tree models

Short term interactions between tree foliage and the aerial environment: An overview of modelling approaches available for tree structure-function models

Process models and model-data fusion in dendroecology

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