CADIC   02618
CENTRO AUSTRAL DE INVESTIGACIONES CIENTIFICAS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Stand growth model for Nothofagus antarctica primary forests
Autor/es:
IVANCICH, H; MARTÍNEZ PASTUR, G; CELLINI, JM; LENCINAS, MV; PERI, P
Lugar:
Bariloche, Argentina
Reunión:
Congreso; VI Southern Connection Congress; 2010
Resumen:
The estimation of growth is crucial in the forest planning. An alternative is through stand models, for this reason the objective was develop a model in pure stands of Nothofagus antartica of complete density in a site quality and ages gradients. The sample was obtained in an age gradient (20 to 220 years) and site quality (IS50= 2.5 to 10.8 m). In each plot, data of forest structure and samples for tree-ring measurement were taken in all trees (n= 1480), in order to estimate growths using biometric models previously developed. To fit the model the growth values of each plot during the last twenty years were calculated, using the ratio of total volume increment/basal area as variable to be estimated. The developed model brings this relationship in function to the site quality and stand age. The statistics (r²= 0.804, mean error= 0.0002, absolute mean error = 0.028), residual analysis and biological behavior were satisfactory. Values obtained through this model multiplied with the stand basal area offers the volumetric growth per hectare per year. The obtained values varied between: 15-40 years between 0.31-0.16 m³.m-².ha-1.year (site I) and 0.08-0.05 m³.m-².ha-1.year (site V); 40-80 years between 0.16-0.11 m³.m-².ha-1.year (site I) and 0.05-0.03 m³.m-².ha-1.year (site V); 80-160 years between 0.11-0.07 m³.m-².ha-1.year (site I) and 0.03-0.025 m³.m-².ha-1.year (site V); and 160-200 years between 0.07-0.06 m³.m-².ha-1.year (site I) and 0.025-0.022 m³.m-².ha-1.year (site V). The obtained stand growths varied between 1.3-8.3 m³.ha-1.year. This simple model allowed obtaining precise growth values at stand level from of easy mensuration and estimation variables. This type of stand models can be an effective tool for farm planning and ordination for forest management of Nothofagus antartica.