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Báo cáo khoa học: "Beech (Fagus sylvatica L.) branches show acclimation of xylem anatomy and hydraulic properties to increased light after thinning"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Beech (Fagus sylvatica L.) branches show acclimation of xylem anatomy and hydraulic properties to increased light after thinning. | Ann. For. Sci. 59 2002 761-766 INRA EDP Sciences 2002 DOI 10.1051 forest 2002062 761 Original article Beech Fagus sylvatica L. branches show acclimation of xylem anatomy and hydraulic properties to increased light after thinning Damien Lemoine Sophie Jacquemin and André Granier INRA Unité d Écophysiologie Forestière 54280 Champenoux France Received 6 July 2001 accepted 23 May 2002 Abstract - Hydraulic acclimation of Fagus sylvatica L. was analysed in response to forest thinning. Several months after thinning leaf and xylem water potential and stomatal conductance of thinned branches were compared to sun-exposed and shade branches. We characterised vulnerability to cavitation for branches taken from these three treatments. We compared effect of thinning on xylem anatomy mean vessel diameter vessel density . Thinned branches exhibited higher stomatal conductance and lower leaf water potential. These results were well correlated with vulnerability to cavitation. Thinned branches were less vulnerable than shade branches and mean vessel diameter and vessel density increased in thinned branches. These differences showed a partial hydraulic acclimation to climate changes. We confirmed that vulnerability to cavitation and xylem anatomy in Fagus sylvatica acclimate to changing light conditions and we concluded that hydraulic architecture acclimates sufficiently fast after environmental changes to protect xylem from dysfunction while maintaining open stomata. Fagus sylvatica L. thinning xylem embolism xylem anatomy light acclimation Résumé - Acclimatation anatomique et hydraulique du xylème après une éclaircie chez le hêtre Fagus sylvatica L. . Nous avons analysé l acclimatation hydraulique dehêtre Fagus sylvatica L. suite àune éclaircie forestiere. Quelques mois après l éclaircie nous avonsmesurélepo-tentiel hydrique des feuilles et du xylème et la conductance stomatique de branches éclaircies et comparé ces résultats à des branches de lumière et d ombre. Nous avons .