TAILIEUCHUNG - Báo cáo lâm nghiệp: "Effect of species composition, stand density and site index on the basal area increment of oak trees (Quercus sp.) in mixed stands with beech (Fagus sylvatica L.) in northern France"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Effect of species composition, stand density and site index on the basal area increment of oak trees (Quercus sp.) in mixed stands with beech (Fagus sylvatica L.) in northern France. | Ann. For. Sci. 63 2006 457-467 INRA EDP Sciences 2006 DOI forest 2006026 457 Original article Effect of species composition stand density and site index on the basal area increment of oak trees Quercus sp. in mixed stands with beech Fagus sylvatica L. in northern France Sebastian HElNa Jean-Franẹois DHÔTEb a Forest Research Institute of Baden-Wurttemberg Freiburg Germany b Laboratory of Forest and Wood Resources LERFoB UMR ENGREF INRA 1092 Nancy France Received 16 August 2005 accepted 14 December 2005 Abstract - We investigated the relationship between tree size and radial growth of oak in mixed oak-beech stands where beech basal area ranged from to . We analysed 30 long-term permanent oak-beech plots in northern France with a total of 167 growth periods between 1904 and 2000. The study was based on a nonlinear segmented model of individual tree basal area increment as a function of diameter at breast height which is implemented in the French forest growth simulator Fagacees. We investigated variations of slope Y from the linear branch of the segmented model for oak. We found stand density species composition and site index to have a significant influence. The basal area increment of oak decreased with rising admixture of beech and increased with site quality and lower stand density. The effect of beech admixture found in the present study corresponds with findings from tree physiology on below- and aboveground competition. Our results underline differences in competitiveness and long-term species dynamics in mixed oak-beech stands. mixed-species stands basal area growth Quercus sp. Fagus sylvatica mixed model Résumé - Effet du mélange de la densité et de l indice de fertilite sur l accroissement en surface terrière du chêne Quercus sp. dans des peuplements melanges avec du hêtre Fagus sylvatica L. dans le nord de la France. Nous avons analyse la relation entre le diamètre du tronc et l accroissement radial du chêne dans des peuplements melanges de

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