Banca de QUALIFICAÇÃO: LARISSA GONÇALVES MORAES

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : LARISSA GONÇALVES MORAES
DATE: 18/02/2022
TIME: 14:00
LOCAL: Sala Virtual no Google Meet (https://meet.google.com/wie-teuk-jia)
TITLE:

EFFECTS OF FORKING, SPACING, AND AGE ON THE WOOD QUALITY OF Tachigali vulgaris FROM HOMOGENEOUS PLANTATIONS FOR BIOENERGY GENERATION IN THE AMAZONIA

KEY WORDS:

Bioenergy. Tachi-branco. Wood quality. Amazonia.

PAGES: 46
BIG AREA: Ciências Agrárias
AREA: Recursos Florestais e Engenharia Florestal
SUBÁREA: Tecnologia e Utilização de Produtos Florestais
SPECIALTY: Propriedades Fisico-Mecânicas da Madeira
SUMMARY:

In recent years, studies on the potential of native species for the composition of plantations for bioenergy purposes have gained prominence, among the species investigated the Tachigali vulgaris presents promising characteristics for alternative use to Eucalyptus in the Amazon region. However, a problem observed is the occurrence of significant rates of bifurcation in experimental areas. In this context, the objective of this study was to understand the effects of forking, age, and spacing on the pattern of density variation and anatomical characteristics of the wood of T. vulgaris from experimental plantations for energy purposes in the Amazon. The material was collected from a plantation belonging to the Jari Celulose S.A. company, located in the Almeirim municipality, in the lower Amazon region, Pará state. The experiment was set up in 2010 in a randomized block design, composed of 3 blocks, in which each block was divided into 6 plots, with dimensions of 60 x 51 m (3,060 m²/plot), consisting of 6 distinct spacings (4.5 m²; 6.0 m²; 7.0 m²; 9.0 m²; 10.5 m² and 12.0 m² per plant.) ). A total of 54 trees were harvested, 18 with a single stem and 36 with secondary stem, from which 5 cm thick discs were removed at 0%, 1.30, 25%, 50%, 75%, and 100% of the commercial height. The basic density and microdensity along the stem and the proportion of heartwood and sapwood at breast diameter height were evaluated. For the analysis of variation and classification of basic density, simple descriptive statistics of mean and coefficient of variation were used. The data for heartwood and sapwood were submitted to univariate analysis of variance using a randomized block design in subdivided plots, where the plots were composed of the six levels of tree density per hectare and the subplots were composed of the stem type. The greatest variations in basic density were found in the forked trees and the highest proportions of medium density positions were obtained at the wider spacings. The apparent microdensity profile presented by the species was decreasing in the medulla-shell direction and decreasing in the base-top direction. For the wood characteristics of average percentages of heartwood area, sapwood, C/A ratio, disc area, density at DBH, and per stem no statistically significant effect of the interaction between tree density per hectare and stem type was observed. The effect of tree density per hectare was pronounced for the variables average percentage of heartwood area, sapwood, and C/A ratio, while for the disc area there was an effect of tree density per hectare and type of stem. The species shows better development at spacings with intermediate tree density, such as 9.0 m². The bifurcation harms wood density and increases the variations of this variable within the stem. Therefore, it is a factor to be isolated in genetic improvement studies, since it can cause losses in the forest logistics chain, as well as a decrease in wood quality and productivity.  

BANKING MEMBERS:
Presidente - 1134991 - THIAGO DE PAULA PROTASIO
Interna - 2410727 - LINA BUFALINO
Externa à Instituição - GRAZIELA BAPTISTA VIDAURRE - UFES
Externa à Instituição - ANA CAROLINA MAIOLI CAMPOS BARBOSA - UFLA