DETERMINAÇÃO DA DENSIDADE BÁSICA DA MADEIRA DE GRANDIUVA D´ANTA (PSYCHOTRIA CF. SESSILIS (VELL.) MUELL. ARG.) AO LONGO DO FUSTE

Abstract

The current work has as objective to determine and compare the variation of basic density of the wood throughout the stem of Psychotria cf. Sessilis, specie belonging to the Rubiaceae family and known popularly as grandiuva d'anta. The sample was performed in three selected trees at random in Dense Ombrophila Forest, in the municipality of Apiuna and Presidente Nereu Ramos - SC. The trees were knocked and they had its dendometric variables measured. The basic density was determined in samples 1,5 x 1,5 x 5 cm, taken from inside of the disc (cerne) and from the outside (alburno), being these collected next to chest (DAP), 0%, 10%, 50%,75%, 95% from the point of morphologic inversion, above this, two samples with branches named G1 and G2 were collected. The basic density was obtained through the relation between drought weight and green volume of samples and showing itself growing from the base to the top of the tree. In the analyze of variance's performance (ANOVA) was not able to be verified differences statistically significant between the averages in densities along the log and the branches, the average basic density was 0,426 g.cm3. The uniformity found to the basic density along the stem is a characteristic gives the specie stability and security for its use in structural projects, however it's needed deeper studies to better scientific fundaments of its physical and technological properties.