TAILIEUCHUNG - Báo cáo khoa học: "Carbon balance and tree growth in a Fagus sylvatica stand"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Carbon balance and tree growth in a Fagus sylvatica stand. | 49 Ann. For. Sci. 57 2000 49-61 INRA EDP Sciences 2000 Original article Carbon balance and tree growth in a Fagus sylvatica stand Stephanie Lebaubea Noel Le Goffb Jean-Marc Ottorinib and André Graniera a INRA Unite d Ecophysiologie Forestiere F-54280 Champenoux France b INRA Equipe de Croissance et Production F-54280 Champenoux France Received 7 December 1998 accepted 25 October 1999 Abstract - The objectives of this study were 1 to scale photosynthesis from leaf to crown and to tree scale 2 to determine the proportion of assimilated carbon used for wood construction and whether the fraction of assimilation used for production varies among social classes and 3 to validate the approach by comparing assimilation estimates with independent measurements provided by the eddy covariance technique EC . Measurements growth and gas exchange were performed in a 30-year-old Fagus sylvatica stand during the 1997 growing season on five sample trees of different crown classes dominant codominant and intermediate trees . A nonlinear relationship between net CO2 assimilation and photosynthetically active radiation PAR was found for each sample trees. Canopy net CO2 assimilation was then modelled over a period of non limiting soil water soil water content. Simulated gross assimilation scaled to stand level was in good agreement with stand measurements performed by EC. growth carbon balance photosynthesis crown class Fagus sylvatica L Résumé - Bilan de carbone et croissance dans un jeune peuplement de Fagus sylvatica. Les objectifs de cette étude étaient 1 d estimer la photosynthèse à l echelle de la couronne puis à l echelle de l arbre à partir de mesures foliaires 2 de determiner la proportion du carbone assimilé utilisée pour la construction de bois et sa variation en fonction du statut social de l arbre 3 de valider l estimation de l assimilation en la comparant à une mesure indépendante technique des corrélations turbulentes EC . Les mesures croissance et échanges gazeux ont .

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