GEOSTATISTICAL MODELING OF TIMBER VOLUME SPATIAL VARIABILITY FOR Tectona grandis L. F. PRECISION FORESTRY

Allan Libanio Pelissari,Marcelo Roveda,Sidney Fernando Caldeira,Carla Krulikowski Rodrigues,Ana Paula Dalla Corte,Carlos Roberto Sanquetta

doi:10.1590/01047760201723012291

Allan Libanio Pelissari, Marcelo Roveda + Show 4 more

Open Access

https://doi.org/10.1590/01047760201723012291

Copy DOI

Abstract

ABSTRACT Considering the hypothesis that the wood volumes present spatial dependence, whose knowledge contributes for the precision forestry, the aim of this work was to estimate the volume spatial variability for timber assortments and identify their spatial patterns on Tectona grandis stands. A dataset of 1,038 trees was used to fit taper models and estimate the total stem, sawlog, and firewood volumes in 273 plots allocated on T. grandis stands at eight years old, which represents the second thinning that enables commercial volumes. Semivariograms models was applied to fit the spatial dependence, and punctual kriging was used to compose volume maps. Geostatistical modeling allowed us to estimate the T. grandis spatial variability and develop timber volume maps. Thus, silvicultural treatments, such as thinning and pruning, as well as for planning spatial interventions, are possible to be recommended for aimed wood products.

Highlights

Tectona grandis L. f. (Lamiaceae) is an Asian tree species cultivated in Africa, and South and Central America (NOCETTI et al, 2011; PELISSARI et al, 2013)
Taper functions are essential to measure tree stem forms, providing estimation of diameter at any height, height at any top diameter, and total and commercial tree volumes (BARRIO ANTA et al, 2007; TANG et al, 2016), in which equations have been proposed for quantifying and qualifying the T. grandis wood volume for timber assortments (FIGUEIREDO et al, 2006; LEITE et al, 2011; FAVALESSA et al, 2012)
Max and Burkhart (1976) and Parresol et al (1987) segmented taper models were fitted by Marquardt algorithm to estimate stem diameters, while the powers of Hradetzky (1976) non-segmented taper model were obtained through stepwise process described by Lanssanova et al (2013)

Summary

Introduction

Tectona grandis L. f. (Lamiaceae) is an Asian tree species cultivated in Africa, and South and Central America (NOCETTI et al, 2011; PELISSARI et al, 2013). Taper functions are essential to measure tree stem forms, providing estimation of diameter at any height, height at any top diameter, and total and commercial tree volumes (BARRIO ANTA et al, 2007; TANG et al, 2016), in which equations have been proposed for quantifying and qualifying the T. grandis wood volume for timber assortments (FIGUEIREDO et al, 2006; LEITE et al, 2011; FAVALESSA et al, 2012) These studies did not report the timber volume spatial features, which are special important for forest management (AKHAVAN et al, 2015)

Objectives

Methods

Results