Turno biológico de corta de siete especies forestales de Ecuador

The forest management of timber species requires the precise identification of their Biological Rotation Age (BRA), that is, the optimal period for their utilization. Therefore, this research focused on estimating the BRA of seven forest species through the analysis of tree-rings based on wood samples from the Ecuadorian provinces of Loja, Zamora Chinchipe, and Pastaza. The samples were obtained from the 2017 to 2020 collection of the Dendrochronology Laboratory, which were already prepared and dated. In total, seven forest species (232 trees) were examined: Cordia alliodora (22); Vachellia macracantha (51), Cedrela odorata (13); Cedrela montana (23); Cedrela nebulosa (33), Bursera graveolens (18), and Juglans neotropica (72). The measurements were verified in the Lintab Pro 6 system, and the statistical analysis was performed with the dendrochronological package “dplR” in the R programming environment. To determine the sample size, the Population Expressed Signal statistic was used, resulting in a high value of 0.53 to 0.93. The results revealed that: C. alliodora reached its BRA at 30 years (DBH= 32.8 cm), C. montana at 90 years (DBH= 47 cm); C. odorata at 60 years (DBH= 43.37 cm); C. nebulosa at 51 years (DBH= 36.91 cm); B. graveolens at 177 years (DBH= 45.50 cm); while V. macracantha on average from three sites reached its BRA at 27 years with a DBH of 20.40 cm, and J. neotropica on average from four sites showed its BRA at 117 years with a DBH of 53.51 cm. Additionally, marked variability in annual growth was observed both among species and among sites. This underscores that establishing a uniform BRA based on data from a single location can lead to an erroneous assessment of the BRA, threatening the sustainability of the country's forests. Therefore, the need to consider growth heterogeneity in forest planning to ensure sustainable exploitation is highlighted.

• Hovedforfatter: Guamán Guamán, Lourdes Alexandra (author)
• Format: masterThesis
• Sprog: spa
• Udgivet: 2023
• Fag: IMA; ICA; ANILLOS DE CRECIMIENTO; DIÁMETRO
• Online adgang: https://dspace.unl.edu.ec/jspui/handle/123456789/28652