Banca de QUALIFICAÇÃO: JONATHAN DIAS MARQUES

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : JONATHAN DIAS MARQUES
DATE: 11/12/2023
TIME: 14:00
LOCAL: Plataforma do Google Meet (meet.google.com/kpt-ketd-rgr)
TITLE:

UNDERSTANDING THE EFFECTS OF FERTILIZATION, SOIL TEXTURE, TYPE OF STEM, AND CAMBIAL AGE ON THE WOOD QUALITY OF Tachigali vulgaris  FOR BIOENERGY

KEY WORDS:

Energy forests. Non-destructive methods. Amazon

PAGES: 65
BIG AREA: Ciências Agrárias
AREA: Recursos Florestais e Engenharia Florestal
SUBÁREA: Tecnologia e Utilização de Produtos Florestais
SPECIALTY: Propriedades Fisico-Mecânicas da Madeira
SUMMARY:

Using promising native species for energy purposes in forest plantations is important for contributing to the sustainability of the Amazon region. Tachigali vulgaris (tachi branco) has shown promise for the region. However, various silvicultural aspects and their relationship with wood quality need to be investigated in order to use the species efficiently, contributing to its technological development and implementation on a commercial scale in the Amazon. The aim of this study was to investigate the effects of fertilization, soil texture and age on the quality of T. vulgaris wood for energy purposes. The study area is located at the company Jari Celulose S.A., in the district of Monte Dourado, Almeirim (PA). In 2010, two experimental plantations of approximately 1.6 ha each were set up. The experiments were carried out on yellow latosols of different textures (sandy loam and clayey). The design was in randomized blocks, with 4 blocks, and two treatments were evaluated: one without fertilization and the other with fertilization (320 kg ha^-1 of P₂O₅ and 199 kg ha^-1 of K₂O). 2.5 cm thick discs were taken at 0%, DBH, 25%, 50%, 75% and 100% of commercial height from 32 trees (16 trees in sandy soil and 16 in clay soil - with and without fertilization). This dissertation is divided into three chapters: 1) The effects of fertilization, soil texture, stem type and cambial age on the variation in the apparent density of T. vulgaris wood determined by X-ray densitometry in the pith-bark and base-top directions were evaluated. A population equation was also generated to estimate the basic density of T. vulgaris wood using the apparent density; 2) This chapter will evaluate elemental variation as a function of fertilization, soil texture, stem type and cambial age in the pith-bark direction using X-ray fluorescence; 3) The effects of fertilization, soil texture, stem type and cambial age on the species growth characteristics will be assessed. The results obtained in Chapter 1 showed that the average apparent density was 0.632 g cm^-3 (± 0.098 g cm^-3). It was found that the variation in density between trees represents 39% of the total variation and 69% of the variation is attributed to the longitudinal section of the trees. Furthermore, the relationship between stem diameter and the presence of bifurcations has a positive and negative influence, respectively, on the species average apparent density. Soil types, the presence or absence of fertilization and stem types did not influence the apparent density of the wood, regardless of age and longitudinal position. The population equation generated proved to be suitable for estimating basic density from the apparent density of T. vulgaris wood. The results show the species potential for bioenergy production and, together with the results that will be obtained in Chapters 2 and 3, will contribute to a broader interpretation of its potential for use in commercial plantations in the Amazon.

BANKING MEMBERS:
Presidente - 1134991 - THIAGO DE PAULA PROTASIO
Interna - 2410727 - LINA BUFALINO
Interna - 1550131 - MARCELA GOMES DA SILVA
Externa à Instituição - ANA CAROLINA MAIOLI CAMPOS BARBOSA - UFLA
Externo à Instituição - MARIO TOMMASIELLO FILHO - USP
Externo à Instituição - PAULO RICARDO GHERARDI HEIN - UFLA