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Architectural and geometrical representations of cotton plants to simulate their light interception at low density

Martin P., Clouvel P., Luquet D., Dauzat J.. 2007. In : Fourcaud Thierry (ed.), Zhang Xiao-Peng (ed.). Plant growth modeling and applications. Proceedings PMA06 : The Second International Symposium on plant growth modeling, simulation, visualization and applications, Beijing, China, November 13-17, 2006. Los Alamitos : IEEE Computer Society, p. 116-123. International Symposium on Plant Growth Modeling, Simulation, Visualization and Applications (PMA06). 2, 2006-11-13/2006-11-17, Beijing (Chine).

DOI: 10.1109/PMA.2006.55

The purpose of this investigation was to develop a method for building simplified geometrical representations (GM) of cotton plants that could be used to simulate plant light interception at low planting densities. Individual plants were observed in field trials throughout their growing period and their 3D architecture (AM) was reproduced at all growth stages. The crown envelope of the GM was represented by an ellipsoid. The ellipsoid content consisted of foliage elements randomly dispersed in a planophile distribution. The radiative transfers of both plant representations were simulated in the PAR range using the ARCHIMED simulation platform. Different ellipsoid envelope and foliage element sizes were investigated. With an appropriate set of sizes, light interception calculated using GMs tallied well with that obtained using AMs. It can be concluded that a simple turbid medium model is sufficient for modelling GM content without needing to introduce a clumping factor.

Mots-clés : gossypium; port de la plante; anatomie végétale; modèle de simulation; modèle mathématique; lumière du jour; espacement; régime lumineux; imagerie

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