Abstract
What is the minimum age for clear-cutting native species with energetic potential in the Brazilian semi-arid region? This was the central question of this study, which aimed at estimating the minimum cutting cycle for native woody species from an area covered by a sustainable forest management plan. Individuals (n = 240) of 12 species native to the semi-arid region were measured, and wood discs were taken from them to collect data relative to (i) volume, by an industrial 3D scanner, (ii) density, using a high-frequency densitometer, (iii) age, by a growth ring measuring device, and (iv) the lower heating value, by an oxygen bomb calorimeter and an elemental analyzer. Data were fitted to mathematical models by regression analysis to determine the relationship and significance between the variables analyzed. The estimated minimum age for the harvesting of native woody species was 47 years, determined by the age at which there was stabilization of volume growth curves over time and an increase in density and heating power (wood retraction).
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