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espanolEl objetivo de esta investigacion fue desarrollar modelos de estimacion de la densidad basica de la madera a nivel de arbol completo y a diferentes alturas de arboles de Pinus radiata, a partir de la resistencia de la madera medida con el resistografo, a la altura del pecho a 1,3 m sobre el nivel suelo (DAP). Se utilizo una muestra de 29 arboles de 15 anos de edad, obtenidos al azar, en un ensayo clonal establecido en la Region del Bio-Bio, Chile. Para cada arbol, en seis diferentes alturas relativas del fuste, se determino la resistencia de la madera y la densidad basica, a partir de 174 mediciones realizadas con el resistografo y en muestras de rodelas. Los resultados obtenidos indicaron que tanto la densidad basica como la resistencia de la madera disminuyeron significativamente en funcion de la altura del arbol, en la direccion base y altura comercial, en un 16,8% y 38,5%, respectivamente. Los valores de resistencia media determinados al DAP, presentaron una variacion entre arboles de 11% y 19%. Se genero un modelo que estima la densidad basica a nivel de arbol completo utilizando como unica variable predictora la resistencia media de la madera medida al DAP, con un error de estimacion de 11,9 kg/m3, el cual no disminuye al incorporar variables de estado de arbol (DAP y HT). A partir de este modelo se genero un metodo para estimar la densidad basica en diferentes secciones del arbol. EnglishThe objective of this research was to develop models for estimation of the basic density of wood at full tree level and at different heights of Pinus radiata standing trees, measured from the wood resistance using the resistography at DBH level. A sample of 29 trees of 15 years old was used for the experiment. The trees were selected in a clonal field test established in the Bio-Bio Region, Chile. For each tree, 174 measurements were made with the resistograph and wood disks were obtained to determine the wood resistance and the basic density at six different relative heights of the stem. As a result, a significant decrease of the basic density and resistance of the wood was observed, from the base to the apex of the trees, with values of 16,8% and 38,5% of decrease, respectively for each variable. The average for the resistance values determined at DBH varied between 11% and 19% among the measured trees. A prediction model was generated to estimate the basic density at the tree level using the average resistance of the wood measured to the DBH. The adjustment parameters of the model was a root mean square error value of 11,9 kg/m3, which did not decrease when other variables of tree (DBH or total height) were incorporated. As a main conclusion, a new method to estimate the wood basic density at different sections of the tree was generated using the adjusted model.

Uso del método de resistografía para la predicción de la densidad básica de la madera en árboles en pie de Pinus radiata