PRODUCTIVITY AND QUALITY OF WOOD FROM SPECIES OF Corymbia AND Eucalyptus IN TWO SITES IN BRAZIL
Name: ALEXA BARGLINI DE MELO
Publication date: 24/02/2022
Advisor:
Name |
Role |
|---|---|
| GRAZIELA BAPTISTA VIDAURRE | Advisor * |
| JORDÃO CABRAL MOULIN | Co-advisor * |
Examining board:
| Name |
Role |
|---|---|
| GRAZIELA BAPTISTA VIDAURRE | Advisor * |
Summary: With the introduction of eucalyptus plantations in less favorable locations for their cultivation and the prediction of climate pattern changes, it is necessary to identify adequate species, with less susceptibility to biotic and abiotic stress and the impacts on wood quality. The aim was to evaluate the growth and wood quality of non-traditional species of Corymbia and Eucalyptus, cultivated in two environments in Brazil (Borebi SP and Paraopeba MG), at 6 years of age. Were evaluated from wood basic density and its variation in base-top and pith-bark direction, biomass, heartwood and bark percentage, vessel diameter and frequency, fibers length and wall thickness, annual average increment (AAI) and volume of the species E. amplifolia (AMP), E. longirostrata (EL), E. major (MJ), E. urophylla (UR), Corymbia citriodora subsp. citriodora (CCC), C. citriodora subsp. variegata (CCV), C. henryi (CH) and C. torelliana (CT). Annual values of variables of the average temperature of air (T), precipitation (P) and water deficit (WDE) were used for the comparison of site. Even with the little differences between the mean values of T and P, the WDE was higher in the driest site (Paraopeba), in which lower productivity was observed (IMA and biomass) and heartwood percentage, higher bark percentage, but with no effect on the wood density and vessels diameter. In general, the specie EL presented the smallest differences in the wood properties, and the biggest values of AAI and heartwood percentage (except for the UR); the CCC, the highest density of wood; CT the smallest bark percentage, with values near the UR, while MJ the highest bark percentage. The CCV showed good development in the less dry site (Borebi), but showed a 37% reduction in AAI in the driest site. Despite the CH presenting similar AAI values in both sites, there was a considerable reduction in heartwood formation in the driest site. AMP was the species with the lowest development in both sites; in addition, it showed a productivity reduction of 52% in the driest site. With the difference between the sites, the AAI, heartwood and bark percentages and fiber length were modified in the species of CC, CH, CCV, MJ and CT, showing good development and potential characteristics for cultivation in both sites.
Keywords: potential species; eucalyptus wood; corymbia wood; forest expansion; water deficit.
