Abstract

This work evaluated the growth trend represented by three biological models used for modeling forest growth and production (Schumacher; Chapman-Richards; Logistic). These curves were chosen because they are widely used by forest science professionals. The functions were adjusted under the hypothesis that there is influence of the initial, 6 and 12 month measurements on the shape of the production curves and, consequently, in the estimate of their parameters. The data that formed the adjustment basis were generated by the continuous monitoring performed at 6, 12, and 24 months and later at each 12 months in order to yield the growth patterns for the evaluated plantations. The results herein presented allow us to conclude that independently of the type of adjustment, the Chapman-Richards function was the one that exhibited the best statistics, with the BIAS values reduced in up to 30% when compared to the others. The Schumacher function presented the worst performance among the proposed criteria in this study. So, given the results obtained, we suggest a broader reflection about the growth and production issue, especially for the use of biometric models applied to forest production forecast, in which stability and adherence of the curves to the data are expected

Highlights

  • The study of forest growth and production is extremely relevant for the supply of forest-based projects

  • Growth and production models are adjusted to data from forest inventories

  • Many different studies have been performed aiming to evaluate the accuracy of the estimates of growth and production models in forest plantations such as the works of Calegario et al (2005); Martins et al (2014); Scolforo et al (2016); and Mendonça et al (2017)

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Summary

Introduction

The study of forest growth and production is extremely relevant for the supply of forest-based projects. Many different studies have been performed aiming to evaluate the accuracy of the estimates of growth and production models in forest plantations such as the works of Calegario et al (2005); Martins et al (2014); Scolforo et al (2016); and Mendonça et al (2017). These studies have always used CFI data with measurements taken from permanently installed plots 24 months after the planting date

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