MULTIVARIATE ANALYSIS FOR CLASSIFICATION OF DENDROMETRIC AND ENERGETIC VARIABLES OF Eucalyptus benthamii

Cristiane Carla Benin,Luciano Farinha Watzlawick,Vanderlei Aparecido De Lima

doi:10.5380/rf.v51i1.67423

Cristiane Carla Benin, Luciano Farinha Watzlawick + Show 1 more

Open Access

https://doi.org/10.5380/rf.v51i1.67423

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Abstract

The objective of this study was to evaluate dendrometric data and energetic properties of E. benthamii, based on evaluations in plantations of different ages and regions of production, in Guarapuava-PR, through multivariate statistical analysis. The data refer to three regions (R1, R2 and R3) and ages (5, 6 and 7 years), were submitted to multivariate techniques: factor analysis, analysis of the main components and analysis of hierarchical grouping. The reduction in the dimensionality of the data was found containing only 5 attributes of the initial 13, which are (average DBH, average height, volume per hectare, basic density of wood and energy density), associated with two main components, capable of representing 95.22% of the data variance. The plantations in the R1 region with seven years of age showed excellent energetic properties, while the plantations in R2 region with seven years and R3 region with six years represent more productive areas, evaluated by dendrometric variables. It was also observed that plantations with older age and higher basic wood density have higher quality for energy use. It can be concluded that the cluster analysis was adequate to efficiently stratify regions and ages with higher and lower productivity, as well as those with better energetic properties.

Highlights

The preference for fast-growing species and the diversity of wood uses underscore the importance of the Eucalyptus genus in Brazil, as well as the prominence of silvicultural practices, evolution of technologies and forest management were fundamental for the forest sector growth and consolidation of eucalyptus culture
Regarding the variables of diameter at breast height and height, the average results were lower than those recorded by Vidaurre et al (2015) in which they observed for E. benthamii at five years of age, in experimental conditions, values of diameter between 16.98 to 23.13 cm and 22.71 to 23.87 m for total height, as a function of smaller to wider spacing, respectively
When evaluating the basal area, depending on the factors evaluated in this study, the variation found can be explained by the factors that affect this property, which according to Schneider (1993) is the average diameter and number of individuals per unit area (N/ha), which were lower in some regions and ages

Summary

Introduction

The preference for fast-growing species and the diversity of wood uses underscore the importance of the Eucalyptus genus in Brazil, as well as the prominence of silvicultural practices, evolution of technologies and forest management were fundamental for the forest sector growth and consolidation of eucalyptus culture. The growing interest in the use of forest biomass for energy production, as it is a renewable source, is no longer seen as just another use for wood and become one of the forest business areas. The suitability of a species for energy use, in addition to the basic density of wood, it is essential to know the behavior of the energetic properties of the material, such as calorific value, volatile material content, fixed carbon and ash, in order to guarantee an efficient use of the resource. Factor Analysis (FA) allows to represent the behavior of a relatively large number of observed variables, in a relatively small number of latent variables or factors, and the variables are grouped by means of their correlations, that is, those belonging. C. et al ISSN eletrônico 1982-4688 to the same group will be strongly correlated, but weakly correlated with the variables of another group, and each group of variables represent a factor (BEEBE et al.,1998)

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