TAILIEUCHUNG - Báo cáo khoa học: " Application d’un modèle de pénétration de la lumière à une jeune plantation de hêtre avec abri latéral*"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: " Application d’un modèle de pénétration de la lumière à une jeune plantation de hêtre avec abri latéral*. | Ann Sci For 1997 54 243-260 Elsevier INRA 243 Article original Application d un modèle de penetration de la lumière à une jeune plantation de hêtre avec abri lateral I Planchais1 2 JY Pontailler1 7Laboratoire d ecologie végétale CNRS-Ura 2154 Băt 362 université Paris-XI 91405 Orsay cedex 2Departement des recherches techniques Office national des forets boulevard de Constance 77300 Fontainebleau cedex France Recu le 5 janvier 1996 accepté le 11 mars 1996 Summary - A radiative transfer model applied to a young beech plantation. A radiative transfer model developed for row crops Sinoquet INRA-Clermont-Ferrand France was applied to a young beech row plantation partly sheltered by a mature forest. The leaf area index of the forest was estimated by a LAI 2000 PCA plant canopy analyser and the leaf area uniformly distributed within the canopy. In each row 15 beech trees were measured to establish the main dimensions of the mean tree and its crown. The rows were then modelled as a series of mean individual plants whose leaf area was estimated from an allometric relationship with the diameter of the trees and then uniformly distributed within the crowns. The test of the model was based on radiation measurements in the PAR waveband below and above the rows. With regard to transmitted radiation above the five rows the outputs of the model were in close agreement with the measurements. In spite of large discrepancies in the estimation of transmitted radiation at ground level global results suggest that the model correctly approximates light distribution inside the plantation. By testing a few simple hypotheses it was shown that the fine structure of young beech trees spatial variation in leaf area density clumping needs to be further investigated. This approach suited to account for any canopy structure appears to be a useful predictive tool for assessing the radiation environment within specific discontinuous canopies. light I Fagus sylvatica I radiative transfer model row .

• Báo cáo khoa học
• Báo cáo lâm nghiệp hay
• cách trình bày báo cáo
• báo cáo lâm nghiệp
• công trình nghiên cứu lâm nghiệp
• tài liệu về lâm nghiệp