Dendrocronología apoyada en Rayos X de la especie Campnosperma panamense standl. Visando recomendaciones para el manejo forestal en los bosques de Guandal del Pacífico Colombiano.

Abstract

The Colombian Pacific region is the second largest forest reserve in the country, characterized by its high biodiversity, and its ecosystems include the guandal forest. These forests are an edaphic-hydric association where one of the species belonging is the sajo (Campnosperma panamense Standl.), a species that forms coetaneous stands mainly used by natives of the region. The wood is one of the most traded and transported in Colombia with a large number of applications for which the management of these types of forests and the permanent information related to the growth and dynamics of the specie through dendrochronological analysis is relevant. The source for obtaining samples was the center marketing of timber in the municipality of Buenaventura from the village of Puerto Saija, Timbiquí, Cauca. Ten pieces of wood were obtained and prepared for the dendrochronological study, which included sanding and image processing. Fragments were also extracted for densitometric tests done at ESALQ-USP, Brazil. The anatomical analysis typified the ring marking by pore alignment between latewood to earlywood transition, the co-dating for the 10 pieces studied 6 of them presented correlations higher than 0.6 with the largest series from 1974 to 2017, the master series and correlation with precipitation was performed. Afterwards, with the ring width data, the growth was modeled by means of the Von Bertalanffy equation for different asymptotes (1000, 800 and 650mm) and the parameters were introduced in the ICA and IMA equations, finding an average of 38 years with a diameter of 426mm. A new methodology is proposed to obtain the diameter and age of harvesting with the trifurcation point of the three asymptotes resulting in an average of 444mm with 40 years, from which the 95% percentile was chosen which would correspond to an age of 47.5 years and 524.7mm diameter at the base. The recommendation is to implement this age for the minimum cutting diameter with thinning at the top.