Asymmetric competition increases leaf inclination effect on light absorption in mixed canopies - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Annals of Forest Science Année : 2013

Asymmetric competition increases leaf inclination effect on light absorption in mixed canopies

Guillaume Simioni
Marion Durand-Gillmann
  • Fonction : Auteur
Roland Huc
  • Fonction : Auteur

Résumé

The effects of leaf inclination on plant light capture, growth, and water balance of monospecific canopies are well documented, but we still lack information on such effects in the case of multispecific canopies. We investigated the effects of leaf inclination on the absorption of photosynthetically active radiation (PAR) of a mixed forest. We ran a 3D mechanistic radiation transfer model for a Mediterranean forest where Pinus halepensis makes the upper strata while Quercus ilex occupies the lower strata. As factors, we included (1) the distributions of leaf inclinations that ranged from vertical to horizontal (including the actual inclinations), (2) the fraction of diffuse light, sun position, and leaf area index (LAI), and (3) the Pinus/Quercus LAI ratio. Simulated PAR absorption was more than twice as sensitive to leaf inclination in oaks than in pines because oaks depended on PAR transmitted below the pine layer. The extent of the effect depended on season, fraction of diffuse light, LAI, and vegetation spatial structure. None of the observed inclinations maximized PAR absorption, suggesting a trade-off with water economy. Erroneous assumptions about leaf inclination lead to larger errors when modelling heterogeneous, mixed canopies. This also highlights potential caveats when using models that do not account for the spatial structure of canopies.
Fichier principal
Vignette du fichier
13595_2012_Article_246.pdf (463.63 Ko) Télécharger le fichier
Origine : Publication financée par une institution
Loading...

Dates et versions

hal-01201466 , version 1 (17-09-2015)

Licence

Copyright (Tous droits réservés)

Identifiants

Citer

Guillaume Simioni, Marion Durand-Gillmann, Roland Huc. Asymmetric competition increases leaf inclination effect on light absorption in mixed canopies. Annals of Forest Science, 2013, 70 (2), pp.123-131. ⟨10.1007/s13595-012-0246-8⟩. ⟨hal-01201466⟩
26 Consultations
231 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More