Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: "Aboveground biomass relationships for mixed ash (Fraxinus excelsior L. and Ulmus glabra Hudson) stands in Eastern Prealps of Friuli Venezia Giulia (Italy)" | Ann. For. Sci. 62 2005 831-836 INRA EDP Sciences 2005 DOI forest 2005089 831 Original article Aboveground biomass relationships for mixed ash Fraxinus excelsior L. and Ulmus glabra Hudson stands in Eastern Prealps of Friuli Venezia Giulia Italy Giorgio ALBERTIa Patrick CANDIDOa Alessandro PERESSOTTIa Sheera TURCOa Pietro PIUSSIb Giuseppe ZERBIa a Department of Agriculture and Environmental Sciences University of Udine Via delle Scienze 208 33100 Udine Italy b Department of Agriculture and Forest Sciences and Technologies University of Firenze Italy Received 16 November 2004 accepted 11 July 2005 Abstract - About 5 of forest area of Friuli Venezia Giulia Italy is covered by mixed ash stands. In most cases these are secondary forest established on former pastures and grasslands in the last fifty years and they constitute an important resource from an economic point of view. This paper presents allometric equations describing tree size-shape relationships for ash Fraxinus excelsior L. and wych elm Ulmus glabra Hudson . Diameter at breast height explained most of the variability of the dependent variables total stem volume total aboveground stem branches and leaves biomass . Wood density variations with stem height and leaf area index LAI were also investigated. biomass LAI allometric equation Fraxinus excelsior Ulmus glabra Résumé - Biomasse aérienne chez des peuplements melanges de frêne Fraxinus excelsior L. et Ulmus glabra Hudson dans les Préalpes de Friuli Venezia Giulia Italie . Environ 5 de la surface forestière de Friuli Venezia Giulia Italie est constituée de peuplements de frêne en mélange avec d autres essences. Dans la plupart des cas ce sont des forêts secondaries installées sur des pâturages et des prairies au cours des cinquante dernières années. Elles constituent une importante ressource économique. Cet article présente les équations allométriques pour l estimation de la biomasse aérienne pour le frêne Fraxinus excelsior L. et pour l orme de .
