Forest management is the legal instrument to propose interventions and conservation of tree species in natural forests; it is a requirement for the management of commercial forest plantations. Considering as objective the conservation with sustainable management and knowledge of the increment rates in forests with Araucaria angustifolia, growth models were fitted with the measures of ring increment data of 587 trees, covering all distribution diameter classes, in four sites in southern Brazil. These fitted models showed the minimum cutting diameter of 40 cm for about 20 years (maximum annual increment in volume), cutting diameter of 55 cm in 37 years (maximum annual mean volume increment) and cutting cycle of 2 to 22.5 years for the diameter classes. The current increment rates in these diameter classes showed the need for approximately 20 years for the species to reach the minimum logging diameter. The lower growth rate in smaller diameter classes indicates that the species requires more time to reach the minimum cutting diameter, which is detrimental to the forest structure. The growth rate variability must be considered in the management of forests with A. angustifolia. The results showed the need and viability of sustainable silvicultural interventions to preserve forest diametric structures; otherwise the forest could compromise the development of larger trees. Keywords: Growth, forest production, araucaria forest. ResumenManejo forestal para la conservación de Araucaria angustifolia en el sur de Brasil. El manejo forestal es el instrumento legal para proponer intervenciones y conservación de especies en bosques naturales, siendo un requisito para la ordenación de la producción forestal. Con el objetivo de promover la conservación con gestión sostenible y conocer las tasas de incremento de bosques con Araucaria angustifolia, se ajustaron modelos de crecimiento con las medidas del incremento de anillos obtenidos de tarugos en 587 árboles, cubriendo la distribución de las clases de diámetro en cuatro sitios del sur de Brasil. El ajuste demostró: diámetro mínimo de corte de 40 cm alrededor de 20 años (máximo incremento corriente anual en volumen), diámetro límite de corte de 55 cm en 37 años (máximo incremento medio anual en volumen) y ciclo de corte de 2 a 22,5 años entre las clases de diámetro. La dinámica actual de la tasa de incremento entre las clases de diámetro mostró la necesidad de aproximadamente 20 años para que la especie alcance el diámetro mínimo de corte. La tasa de crecimiento menor en las clases diamétricas más pequeñas indica que la especie requiere más tiempo para alcanzar el diámetro mínimo de corte, que es perjudicial a la estructura del bosque. Los resultados sugieren que el manejo forestal en bosques de araucaria debería considerar la variabilidad de las tasas de crecimiento. Además, los resultados demuestran la viabilidad y necesidad de una intervención silvícola sostenible para conservar la estructura diamétrica, de lo contrario el bosque podría comprometer el desarrollo de una...
Studies on morphology and occupancy area of trees provide knowledge on features and functions of forest ecosystem, especially in terms of competition and growth of trees. The main purpose of this work was to develop models for shape and size relationships of Araucaria angustifolia in natural forest remains of species. Dendrometric and morphometric variables from 210 trees from three sites were used. Results showed that the species present different shape and size, vigor and productive capacity in evaluated sites. Fitted models indicated that there was transition in competition mode (symmetric or asymmetric) for resources, which is result of available growing space for trees. Relationship between shape and size is derived from slope of regression line and regarded as an indication of need for silvicultural interventions to reduce competition, which is a key information for obtaining better practices in forest management.
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