Hypsometric models for a clonal plantation of Tectona grandis Linn F. subjected to selective thinning

Abstract

At a moment when the importance of planted forests in the Amazon region is increasing, hypsometric models become highly relevant tools as they allow monitoring of and planning for tree plantations in a way that is practical and economic for the producer. Thus, the objective of the current study was to select and adjust a model of hypsometric relationships for a clonal plantation of Tectona grandis Linn F., submitted to selective
 thinning, located in Capitão Poço municipality, Pará state, Brazil. Data were collected from permanent plots in five-year-old stands using the fixed area method and systematic process. The best adjusted model was selected with an adjusted determination coefficient (R²aj.%), residual standard deviation of the percentage estimate (Syx%), recalculated residual standard error (Syxr%), diagnosis of distribution of residuals as a percentage and
 the Percent Average Deviation (PAD%). Hyperbolic models 2 and 3 had the highest determination coefficients (83.42 and 83.40%) and lowest PAD (-0.006 and -0.154%). The polynomial (1) and hyperbolic models (2 and 3) showed the smallest errors in related to the estimates. Model 2 (hyperbolic) was found to generate the
 best estimate of total T. grandis clonal plantation height. Use of this hypsometric model will allow a significant
 reduction of costs and time in forest inventory studies.

VARIATIONS IN THE PHYSICAL PROPERTIES OF TEAK (Tectona grandis L. F.) PLANTED IN THE BRAZILIAN AMAZON

“…Due to the importance of this species, studies are being developed in several areas, especially the area of chemistry, wherein the species characteristics are analyzed with respect to the chemical components present in the species (QIU et al, 2019;SUAREZ et al, 2019;SURYANTI et al, 2020 andROSAMAH et al, 2020). Furthermore, ecological and environmental services (PALAKIT et al, 2019;CLÉMENT et al, 2019;PEREZ et al, 2020), biotechnology (AGUILAR et al, 2019, genetics and genetic improvement (SCHUHLI; PALUDZYSZIN FILHO, 2010;HURTADO et al, 2020;), as well as forest productivity (PELISSARI et al, 2013;SANQUETA et al, 2015;SANTOS et al, 2019;VAIDES-LÓPEZ et al, 2019;and SOUZA et al 2019) in different locations where this species is planted and commercialized, have been studied.…”