Recommendation of non-destructive sampling method for density estimation of the Eucalyptus wood

Franciane Andrade De Pádua,João Otávio Poletto Tomeleri,Mariana Pires Franco,Paulo Fernando Trugilho,José Reinaldo Moreira Da Silva

doi:10.4067/s0718-221x2019005000412

Franciane Andrade De Pádua, João Otávio Poletto Tomeleri + Show 3 more

Open Access

https://doi.org/10.4067/s0718-221x2019005000412

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Abstract

This study aimed to determine the wood density using destructive and non-destructive sampling methods in a eucalypt hybrid clonal and determine the best point for the non-destructive sampling of the tree. A 5.6-year-old Eucalyptus urophylla x Eucalyptus grandishybrid clone, from an energetic forest, was used, planted in the municipal district of Martinho Campos, MG, Brazil. The trees were sampled by three methods of destructive sampling. The traditional method (0%, 25%, 50%,75% and 100% of the commercial height Hc); alternative method (2%, 10%, 30% and 70% Hc) and via a meter by meter method starting from a height of 1.30 m from the soil (DBH). Three non-destructive sampling methods were also appraised: Resistograph®, Pilodyn® and 22 mm diameter cores at a DBH. The use of the Resistograph® at the 1.10 m or 1.50 m points and the Pilodyn® at 1.50m of height from the soil results the best correlations with the basic density determined by the three destructive sampling methods considered.

Highlights

The wood can be considered a heterogeneous natural polymer with a complex organization, consisting of lignin, cellulose, hemicelluloses, and extractives, that vary as much as the proportions found in several genera, species and even between individuals (Santos 2008).To better interpret the characteristics produced by the chemical composition presented by the wood, is essential to consider the identification of the anatomical features as a description of the quality of the wood, such as vessel and fiber dimensions, heartwood ratio about the sapwood, the abundance of extractives, among others
The destructive and non-destructive sampling methodologies were applied in a total of 50 trees of a clonal hybrid of Eucalyptus urophylla ST Blake x Eucalyptus grandis W
The correlation coefficients between the readings provided by Pilodyn and Resistograph were negative and of low magnitude

Summary

Introduction

The wood can be considered a heterogeneous natural polymer with a complex organization, consisting of lignin, cellulose, hemicelluloses, and extractives, that vary as much as the proportions found in several genera, species and even between individuals (Santos 2008).To better interpret the characteristics produced by the chemical composition presented by the wood, is essential to consider the identification of the anatomical features as a description of the quality of the wood, such as vessel and fiber dimensions, heartwood ratio about the sapwood, the abundance of extractives, among others. For the proper evaluation of the quality of the wood for any use, the identification of the properties that affect the final product is fundamental. In this sense, the basic density is considered an important qualitative index of the wood for its diverse uses. The basic density is considered an important qualitative index of the wood for its diverse uses It is because the basicdensity is correlated with a high number of other properties and exerts a high influence on the quality and yield of specific products, besides its importance in the estimation of forest biomass and carbon storage.It is a property of easy determination and high heritability

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