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Simple equations to estimate light interception by isolated trees from canopy structure features: assessment with three-dimensional digitized apple trees Inra
Sinoquet, H.; Stephan, J.; Sonohat, G.; Lauri, P.E.; Monney, P..
Simple models of light interception are useful to identify the key structural parameters involved in light capture. We developed such models for isolated trees and tested them with virtual experiments. Light interception was decomposed into the projection of the crown envelope and the crown porosity. The latter was related to tree structure parameters.Virtual experiments were conducted with three-dimensional (3-D) digitized apple trees grown in Lebanon and Switzerland, with different cultivars and training. The digitized trees allowed actual values of canopy structure (total leaf area, crown volume, foliage inclination angle, variance of leaf area density) and light interception properties (projected leaf area, silhouette to total area ratio, porosity,...
Tipo: Journal Article Palavras-chave: INTERCEPTION DE LA LUMIERE; NUMERISATION TRI-DIMENSIONNELLE CANOPY ENVELOPE; CLUMPING; ISOLATED TREE; LIGHT INTERCEPTION; MODELLING; POROSITY; THREE-DIMENSIONAL (3-D) DIGITIZING.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200746bb7b37&uri=/notices/prodinra1/2008/07/
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Vertical porosity profile of a clay-rich marsh soil Inra
Dudoignon, P.; Causseque, S.; Bernard, V.; Hallaire, V.; Pons, Y..
The evolution of clay soil porosity is currently demonstrated via the shrinkage curves in a large water content domain spreading from a shrinkage limit to a liquidity limit. In fact, the parallel between in situ profiles and the shrinkage curves in such a large water content range is difficult to obtain because of the lack of earth pressure in the laboratory tests and in situ limited water contents. The vertical distribution of porosity throughout a clay-rich marsh soil profile was studied in a grassland field with samples taken from the soil surface characterized by water contents near their shrinkage limit down to 2.00 m deep saturated sediments over their liquidity limit. The depth of the plasticity limit isolates a soil in a solid state characterized...
Tipo: Journal Article Palavras-chave: SOL; POROSITE; EAU; ANALYSE D'IMAGE CLAY SOIL; SHRINKAGE CURVES; IMAGE ANALYSIS; POROSITY.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200928b853f9&uri=/notices/prodinra1/2010/09/
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