Article (Scientific journals)
Radiative transfer modeling in structurally complex stands: towards a better understanding of parametrization
André, Frédéric; de Wergifosse, Louis; de Coligny, François et al.
2021In Annals of Forest Science, p. 78-92
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Keywords :
light interception; Heterogeneous forests; Crown asymmetry; Beer lambert; Porous envelop; Bayesian optimization
Abstract :
[en] Key message : The best options to parametrize a radiative transfer model change according to the response variable used for fitting. To predict transmitted radiation, the turbid medium approach performs much better than the porous envelop, especially when accounting for the intra-specific variations in leaf area density but crown shape has limited effects. When fitting with tree growth data, the porous envelop approach combined with the more complex crownshape provides better results. When using a joint optimization with both variables, the better options are the turbid medium and the more detailed approach for describing crown shape and leaf area density. Context : Solar radiation transfer is a key process of tree growth dynamics in forest. Aims : Determining the best options to parametrize a forest radiative transfer model in heterogeneous oak and beech stands from Belgium. Methods : Calibration and evaluation of a forest radiative transfer module coupled to a spatially explicit tree growth model were repeated for different configuration options (i.e., turbid medium vs porous envelope to calculate light interception by trees, crown shapes of contrasting complexity to account for their asymmetry) and response variables used for fitting (transmitted radiation and/or tree growth data). Results : The turbid medium outperformed the porous envelope approach. The more complex crown shapes enabling to account for crown asymmetry improved performances when including growth data in the calibration. Conclusion : Our results provide insights on the options to select when parametrizing a forest radiative 3D-crown transfer model depending on the research or application objectives.
Disciplines :
Environmental sciences & ecology
Author, co-author :
André, Frédéric;  Université Catholique de Louvain - UCL
de Wergifosse, Louis;  Université Catholique de Louvain - UCL
de Coligny, François;  AMAP, Université de Montpellier, CIRAD, CNRS, INRAE, IRD
Ligot, Gauthier ;  Université de Liège - ULiège > Département GxABT > Gestion des ressources forestières et des milieux naturels
Gauthray-Guyénet, Vincent ;  Université de Liège - ULiège > Département GxABT > Gestion des ressources forestières et des milieux naturels
Courbaud, Benoît;  INRAE, Université Grenoble Alpes
Jonard, Mathieu;  Université Catholique de Louvain - UCL
Language :
English
Title :
Radiative transfer modeling in structurally complex stands: towards a better understanding of parametrization
Publication date :
26 October 2021
Journal title :
Annals of Forest Science
ISSN :
1286-4560
eISSN :
1297-966X
Publisher :
Springer, Germany
Pages :
78-92
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 28 October 2021

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