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.


  • The Mixed Ombrophilous Forest of the Atlantic Forest biome is characterized by the presence of Araucaria angustifolia (Bertol.) Kuntze trees (KERSTEN et al, 2015)

  • The results showed a characteristic pattern of natural forests, due to the lack of interventions in the last 40 years in forests with A. angustifolia in southern Brazil

  • The evaluation of dendrometric variables can generate predictions based on the existing conditions for the diameter increment of the species, since the structure and dynamics of the forest are dependent on its age, site, and competition between trees

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The Mixed Ombrophilous Forest of the Atlantic Forest biome is characterized by the presence of Araucaria angustifolia (Bertol.) Kuntze trees (KERSTEN et al, 2015). These trees underwent an uncontrolled exploitation; Brazilian federal laws prohibited its exploitation for wood or forest managements (BRAZIL, 2006; 2008; MMA, 2008), considering that the non-intervention of humans is a form of preserving their remnants. Forest managements must consider the intervention intensity, and the cycle between interventions (cutting cycle) that can be made effective for the sustainability, contributing to the dynamics of forest structure, growth rates, regeneration, and production. Information on the growth of trees is essential to predict their production and elaborate forest management plans, since their growth can vary within the same species; this variability is attributed to combined factors that may have temporal and spatial variation (EASDALE et al, 2007)


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