Forest ecosystems and environments: scaling up from shoot module to watershed

“…Despite the importance of detailed canopy description for many applications, forest stand simulators very rarely address individual tree structural details (Sievänen et al 2008), mainly due to the high computing time required. Maintaining a high degree of structural detail when scaling up from organ level to stand (or landscape) remains an important challenge, as in general, the limitations of computer capacity require many simplifications in individual tree structure modelling (Kohyama et al 2005). To address this challenge, tree structure can be simply represented by crown envelope shape (Rautiainen et al 2008) or by using allometric relations (King 2005;West et al 2009), fractals (Collin et al 2011;Parsons et al 2011), "numerical tree modelling" (Collin et al 2011) or other geometric representations of tree architecture (Cescatti 1997;Perttunen et al 1998;Biliouris et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Connecting an architectural plant model to a forest stand dynamics model—application to Austrian black pine stand visualization

Feng

Reffye

Dreyfus

et al. 2011

Annals of Forest Science

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Abstract& Context Forest stand dynamics models simulate the growth of trees in stands; based on field measurements and system knowledge, they provide a relatively precise representation of forest growth and are well adapted for forest management purposes. Architectural models describe the structure of plants according to ontogenetic development processes; as a support of biomass production and partitioning at organ scale, they simulate individual tree development. & Aims The aim of this study was to link a stand dynamics model and an architectural model to simulate stand dynamics, in which the ecological or silvicultural modelling from the stand model and the architecture representation could be integrated, to provide individual tree details at the stand level. & Methods Stand-level simulations of Austrian black pine dynamics provided global results on tree growth from the empirical forest growth model PNN, and branching details for individual trees were provided by the functionalstructural plant model (FSPM) GreenLab. & Results Individual tree dynamics were computed, and the simulated trees were integrated at the stand level for visualizing two different management scenarios. & Conclusion By combining a stand dynamics model adapted to forest management with an FSPM with detailed tree architecture, it is possible to simulate individual tree structure with consistent dimensions, adapted to ecological and silvicultural modelling for decision support in forest management.

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“…Depending on their objectives, models of forest stand dynamics may account for individual tree structure or not (Kohyama et al 2005;Pretzsch 2009;Feng et al 2012). Schematically, stand-level models can be subdivided in "Empirical Forest Models", mostly used for forest management purposes, and "Process Based Models", which aim at assessing biomass production at the stand level, based on ecophysiological process, and these two types of models can be combined into "hybrid simulation models" (Mäkelä et al 2000;Kimmins et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Stochastic modelling of tree annual shoot dynamics

Reffye

Kang

Hua

et al. 2011

Annals of Forest Science

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Context Modelling annual shoot development processes is a key step towards functional-structural modelling of trees. Various patterns of meristem activity can be distinguished in tree shoots, with active periods of phytomer production followed by rest periods. This approach has seldom been integrated in functional-structural tree models. & Aims This paper presents theoretical research work on modelling and computation of the dynamics of tree annual shoots using stochastic processes with various development patterns: continuous or rhythmic, monocyclic or polycyclic, "seasonal" or "a-seasonal", with preformation or neoformation produced from meristem functioning. & Methods The renewal theory is used to compute stochastic aspects of phytomer production, resulting from meristem extension or rest periods and meristem mortality. & Results Continuous development can be modelled with a Bernoulli process, while rhythmic development is modelled by alternation between extension and rest periods, the duration of each period following specific distributions. & Conclusion The application of such stochastic modelling is the estimation of organ production during tree development as a component of the demand in functional- architectural tree models, used for computing biomass production and partitioning. (Résumé d'auteur

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Forest ecosystems and environments: scaling up from shoot module to watershed

Cited by 6 publications

References 3 publications

Environmental benefits of blue ecosystem services and residents’ willingness to pay in Khulna city, Bangladesh

Environmental benefits of blue ecosystem services and residents’ willingness to pay in Khulna city, Bangladesh

Connecting an architectural plant model to a forest stand dynamics model—application to Austrian black pine stand visualization

Stochastic modelling of tree annual shoot dynamics

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