tailieunhanh - Báo cáo lâm nghiệp: "Merchantable volume system for pedunculate oak in northwestern Spain"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Merchantable volume system for pedunculate oak in northwestern Spain. | Ann. For. Sci. 64 2007 511-520 INRA EDP Sciences 2007 DOI forest 2007028 Available online at Original article Merchantable volume system for pedunculate oak in northwestern Spain Marcos Barrio ANTAa d Ulises DlÉGUEZ-ARANDAa Fernando Castedo-Doradoồ Juan Gabriel Alvarez G0NZALEZa Klaus von Gadowc a Departamento de Ingeniería Agroforestal Universidad de Santiago de Compostela. Escuela Politécnica Superior Campus universitario 27002 Lugo Spain b Departamento de Ingeniería Agraria Universidad de León. Escuela Superior y Técnica de Ingeniería Agraria Avenida de Astorga 24400 Ponferrada Spain c Institut fur Waldinventur und Waldwachstum Georg-August-Universităt Gottingen Busgenweg 5 37077 Gottingen Germany d Current Address Departamento de Sistemas y Recursos Forestales CIFOR-INIA. Carretera de la Coruna km. 7 28080 Madrid Spain Received 23 August 2006 accepted 20 December 2006 Abstract - A model is required for accurate estimation of the merchantable volume of pedunculate oak Quercus robur L. trees in Galicia northwestern Spain. Accordingly the purpose of the present study was to obtain equations for predicting merchantable volumes and stem profiles of individual trees. For this reason two compatible and four non-compatible volume systems were initially evaluated and fitted to data from 251 destructively sampled trees which were collected in stands located throughout the area of distribution of the species in Galicia. The outliers were removed to provide a data set of measurements from 3 090 sections which was then available for fitting. A second-order continuous autoregressive error structure was used to account for autocorrelation. Comparison of the models was carried out using overall goodness-of-fit statistics and box plots of residuals against relative height or diameter class. The compatible volume system of Fang et al. 22 provided the best compromise in describing the stem profile and estimating merchantable height merchantable volume

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