tailieunhanh - Báo cáo lâm nghiệp: "Modelling stand basal area growth for radiata pine plantations in Northwestern Spain using the GADA"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Modelling stand basal area growth for radiata pine plantations in Northwestern Spain using the GADA. | Ann. For. Sci. 64 2007 609-619 INRA EDP Sciences 2007 DOI forest 2007039 Available online at Original article Modelling stand basal area growth for radiata pine plantations in Northwestern Spain using the GADA Fernando CASTEDO-DORADOa Ulises DiÉGUEZ-Arandaồ Marcos Barrio-Antac Juan Gabriel ALVAREZ-GONZALEZb a Departamento de Ingeniería y Ciencias Agrarias Universidad de León Escuela Superior y Técnica de Ingeniería Agraria Campus de Ponferrada 24400 Ponferrada Spain b Departamento de Ingeniería Agroforestal Universidad de Santiago de Compostela Escuela Politécnica Superior Campus universitario 27002 Lugo Spain c Departamento de Biología de Organismos y Sistemas Escuela Universitaria de Ingenierías Técnicas. C Gonzalo Gutiérrez de Quirós 33600 Mieres Spain Received 14 June 2006 accepted 18 October 2007 Abstract - A stand basal area growth system for radiata pine Pinus radiata D. Don plantations in Galicia Northwestern Spain was developed from data corresponding to 247 plots measured between one and five times. Six dynamic equations were considered for analysis and both numerical and graphical methods were used to compare alternative models. The equation that best described the data was a dynamic equation derived from the Korf growth function by the generalized algebraic difference approach GADA and by considering two parameters as site-specific. This equation was fitted in one stage by the base-age-invariant dummy variables method. The system also incorporated an equation for predicting initial stand basal area expressed as a function of stand age site index and the number of trees per hectare. This information can be used to establish the starting point for the projection equation when no inventory data are available. The effect of thinning on stand basal area growth was also analyzed and the results showed that the same projection equation can be used to obtain reliable predictions of unit-area basal area development in thinned and .

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