Abstract

POLANCO TAPIA, César Augusto; CAICEDO VELASQUEZ, Jenny Paola  and  BELTRAN HERNANDEZ, Diego Hernán. Natural durability and anatomy of wood of Caryodaphnopsis cogolloi Van der Werf. Colomb. for. [online]. 2014, vol.17, n.1, pp.25-39. ISSN 0120-0739.

The wood anatomy of Caryodaphnopsis cogolloi Van der Werf was studied using xilological characteristics identified in transverse and longitudinal wood cuts (tangential and radial views). Wood natural durability was established in an accelerated laboratory trial, using two methods: a soil block method established by the Colombian Technical Standard NTC 1127 (NTC for its acronym in Spanish), and an Agar block method ruled by the standard norm EN 350-1: 1994 in which the decay fungi used were Trametes versicolor and Gloeophyllum trabeum. The durability was assessed by weight loss and analysis of the fungal decay characteristics over a four month incubation period on the wood samples where each month the colonization mechanism, development and fungal growth characteristics were observed, along with the effects on the cell wall. Caryodaphnopsis cogolloi wood is significantly resistant to fungal white and brown rotting showing a mean weight loss of 5.1% and 6.1% respectively in the soil block method, while in the agar block method the weight loss was 5.9 % for both fungi. Decay patterns in the samples demonstrated that T. versicolor eroded cell walls and produced enlargement in the cell wall holes in some cells, while G. trabeum produced a reduction in cell wall thickness in a few cells.

Keywords : Agar block; Gloeophyllum trabeum; macroscopy; decay patterns; soil block; Trametes versicolor.

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