TAILIEUCHUNG - Báo cáo lâm nghiệp: "Micrometeorological assessment of sensitivity of canopy resistance to vapour pressure deficit in a Mediterranean oak forest * "

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế, đề tài: "Micrometeorological assessment of sensitivity of canopy resistance to vapour pressure deficit in a Mediterranean oak forest . | 513 Ann Sci For 1996 53 513-520 Elsevier INRA Short note Micrometeorological assessment of sensitivity of canopy resistance to vapour pressure deficit in a Mediterranean oak forest A Pitacco N Gallinaro Institute of Pomology University of Padova Via Gradenigo 6 35151 Padova Italy Received 16 November 1994 accepted 26 June 1995 Summary Canopy surface resistance to water vapour rc of an extensive Quercus ilex L stand Bosco Mesola northeast Italy has been evaluated by inverting the Penman-Monteith equation. The latent heat flux was estimated by applying the Bowen ratio-energy budget micrometeorological method. A linear relationship was found between rc and the vapour pressure deficit. Canopy resistance increased regularly during the day and that yielded a recurring diurnal pattern of energy partitioning where most of the latent heat was dissipated in the early morning and the release of sensible heat increased after midday. This behaviour has been confirmed also by independent estimates of transpiration based on measurements of sap flow velocity in small branches. Ecological consequences of this feature are briefly discussed applying the concept of coupling between canopy and atmosphere. Quercus ilex LI energy balance evapotranspiration canopy resistance sap flow Resume Réponse d un couvert de chênes mediterraneans au deficit de saturation de fair approche micrométéorologique. La resistance du couvert à la vapeur d eau frj d un peulement de Quercus ilex L Bosco Mesola nord-est de I ltalie a été évaluée par inversion de I equation de Penman-Monteith. Le flux de chaleur latente était estimé par la methode du rapport de Bowen. Une relation linéaire entre rc et le deficit de saturation de I air a été trouvée. La resistance du couvert augmentait régulièrement durant la journee ce qui conduisait à une evolution ịournalière de la partition de I energie la plus grande part du flux de chaleur latente était dissipée le matin le flux de chaleur sensible augmentant ensuite dans .

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