Potencial de sequestro de carbono em diferentes materiais genéticos do genero Eucalyptus sp. para a região de Dois Vizinhos - PR

Abstract

The genus Eucalyptus sp. is the most used in forests planted in the country, because it has fast growth and several purposes for its raw material, also being a mitigating alternative to the greenhouse effect through carbon sequestration by tree fixation in the trees biomass and also in the soil. The present paper was realized in an experimental field with 5 years old, in which were sampled individuals of ten different genetic materials, selected in function of better growth among various materials in test. After forest inventory, the individuals were distributed in 5 diametric classes, one individual per class being slaughtered, which were cubed and made the separations and collect of samples of the fraction leaf, twigs, bark and wood fractions of the stem. After the separation, the fractions were weighed in the forest and sub-sampled for the drying in study, milling and analysis of the organic carbon content by the methodology of Yeomans and Bremner. The carbon contents varied, in each fraction, in leaf fraction varies from 1,3 Mg ha-1(E. salignax E. botryoides) until 6,55 Mg ha-1 (E. pellita x E. tereticornis), in the disk fraction varies from 19,86 Mg ha-1 (flowering clone) until 66,41 Mg ha-1 (E. pellita x E. tereticornis), already in the fraction bark from 3,28 Mg ha-1 (clowering clone) until 11,31 Mg ha-1 (E. pellita x E. tereticornis), in the twig fraction it comes from 3,99 Mg ha-1 (E. camaldulensis) until 15,68 Mg ha- 1(E. pellita x E. tereticornis). The carbon stock in the biomass ranged from 28,64 Mg ha-1(flowering clone), The latter showing the best genetic material for carbon sequestration in the region.