TAILIEUCHUNG - Báo cáo lâm nghiệp: "A growth model for Pinus radiata D. Don stands in north-western Spain"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: A growth model for Pinus radiata D. Don stands in north-western Spain. | Ann. For. Sci. 64 2007 453-465 INRA EDP Sciences 2007 DOI forest 2007023 Available online at Original article A growth model for Pinus radiata D. Don stands in north-western Spain Fernando CASTEDO-DORADOa Ulises DlEGUEZ-ARANDAb Juan Gabriel ÃLVAREZ-GONzALEZb a Departamento de Ingeniería Agraria Universidad de León. Escuela Superior y Técnica de Ingeniería Agraria Avenida de Astorga 24400 Ponferrada Spain b Departamento de Ingeniería Agroforestal Universidad de Santiago de Compostela Escuela Politécnica Superior Campus universitario 27002 Lugo Spain Received 15 September 2006 accepted 20 December 2006 Abstract - A dynamic whole-stand growth model for radiata pine Pinus radiata D. Don stands in north-western Spain is presented. In this model the initial stand conditions at any point in time are defined by three state variables number of trees per hectare stand basal area and dominant height and are used to estimate total or merchantable stand volume for a given projection age. The model uses three transition functions derived with the generalized algebraic difference approach GADA to project the corresponding stand state variables at any particular time. These equations were fitted using the base-age-invariant dummy variables method. In addition the model incorporates a function for predicting initial stand basal area which can be used to establish the starting point for the simulation. Once the state variables are known for a specific moment a distribution function is used to estimate the number of trees in each diameter class by recovering the parameters of the Weibull function using the moments of first and second order of the distribution. By using a generalized height-diameter function to estimate the height of the average tree in each diameter class combined with a taper function that uses the above predicted diameter and height it is then possible to estimate total or merchantable stand volume. whole-stand growth model radiata pine

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