Herramientas disponibles para la construcción de un modelo de producción para la lenga (Nothofagus pumilio) bajo manejo en un gradiente de calidades de sitio

G MARTÍNEZ PASTUR; MV LENCINAS; JM CELLINI; B DÍAZ; P PERI; R VUKASOVIC

BOSQUE (VALDIVIA)

Año: 2002 p. 69 - 80

0304-8799

Lenga forests are the main wood resource in southern Argentina and Chile. It is the most studied native species,with enough information of ecology, biometry and silviculture to define timber prediction and forest managementmodels for regional forest planning. General Forest Planning is designed to achieve a continuous and sustainablesupply of logs, but first it is necessary define the land use capability (territorial planning) and determine severaltimber production alternatives. Therefore, it is necessary to have reliable models that offer adequate information fortimber prediction. The aim of this work was to develop a yield model for Nothofagus pumilio along a site qualityrange based on methodologies and models proposed previously in the literature. To fit a production model, fiveassumptions were defined (silvicultural system, objectives of forest management, forest growth, yields and livestockbrowsing), and methodologies and biometric models selected (height growth model, site index classification, DBHgrowth models, stand density index and thinning level diagrams, rotation length, total volume and timber productionof the forest defined along a site quality range). From these models, a silvicultural management system was defined,and their outputs were analyzed from biological and practical use perspectives. This system has five intermediatepractices (three thinning levels with secondary products and two thinning levels with timber products) and a finalcut. The evolution of a stand without silviculture was also analyzed as control. Finally, the outputs of the forestproduction model (yields, growth and timber production), over time for different silviculture treatments are presented.The range of timber production varied from 435 m3/ha of logs without bark over 150 years in the best site class to81 m3/ha over 213 years in a poorest site class.