EstimaÃÃo de ParÃmetros GenÃticos, FenotÃpicos e Ambientais para a Qualidade da Madeira de Eucalyptus em Ãrvores Vivas. / Estimation Of Genetic, Phenotypic And Environmental Parameters For Eucalyptus Wood Quality In Living Trees.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The evaluation of the technological characteristics of wood, in most times, is accomplished through destructive methods. But, that process make it impossible the evaluation of a large number of genetic materials. So, the utilization of non-destructive methods makes it possible to evaluate a large amount of trees, allowing a more intensive selection of trees desirable for mass reproduction and for use in the formation of clonal forests. Thus, the search for non-destructive methods for evaluation of wood properties must be intensified. The objectives of the present study were i) to evaluate the non-destructive sampling methods of wood in living trees; ii) to evaluate the possibilities of obtaining indirect gains in the physical properties of wood and in the sawn wood yield by non-destructive method. For this, 13 Eucalyptus clones aged 10 years cultivated at the spacing of 10.0 x 4.0m.The experiment was established in a completely randomized design with three replicates. The non-destructive measurements were performed by means of the extensometer and Resistograph, measuring DRL and the Amplitude, respectively. After the quantification of those characteristics, logs conicity, circularity, sawn wood defects, shrinkage and basic density were evaluated. It was verified that the linear model offered most precise equations to estimate the basic density. The heritability for the Amplitudes between planting row (AEL), Amplitudes within planting row (ADL), mean Amplitudes (AM) and estimated basic density (DBEst) were high and of the order of 93, 89, 94 and 93%, respectively. A high value of heritability for splitting (84%) and mean values for crook (41%) and bowing (62%) was verified. The Amplitude was highly correlated with crook and splitting of sawn wood. The indirect gains in those characteristics were expressive when selection was conducted in the Amplitude. It was verified that the indirect genetic gains in the radial contraction can be effectively reached when selecting for basic density. It was observed, also, that the indirect genetic gains in basic density can be reached when selecting for Amplitude, determined by the Resistograph or for the basic density estimated by the Amplitude. The Resistograph proved to be effective to evaluate and select genetic materials in the field.

ASSUNTO(S)

genetica e melhoramento florestal

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