Hypsometrical Relation for Acacia mearnsii with Different Ages

• Main Author: Caldeira, Marcos Vinicius Winckler
• Publication Date: 2002
• Other Authors: Schumacher, Mauro Valdir, Scheeren, Luciano Weber, Barichello, Leonir Rodrigues, Watzlawick, Luciano Farinha
• Format: Article
• Language: por
• Source: Pesquisa Florestal Brasileira (Online)
• Download full: https://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1750
• topic: Hipsometric ralation; Height; diameter; Black wattle; Relação hipsométrica; Altura; Diâmetro; Acácia-negra

This work had as objective to select mathematical models to predict the height of trees in function of DBH and age, in black wattle stands, Acacia mearnsii De Wild., in Southeastern region of the State of Rio Grande do Sul, Brazil. For the adjustment of the height data 19 mathematical equations were tested, being used arithmetic and logarithmic linear equations and one no-linear equation (Chapman-Richards). The following statistical criteria were used in order to select the best equations: a) adjusted determination coefficient (Raj), b) standard error of estimate (Syx), c) variation coefficient in percentage (CV%),d) Furnival index in percentage (IF%) and e) F statistic. The analysis of residues graphic was accomplished for the five better ranked mathematical models. The equation 16, represented by log h = b0 + b1 * 1/d + b2 * 1/I + b3 * 1/D * I resulted as the most efficient model, estimated as function of DBH and age of trees, to adjust the heights in stands with ages of 2, 4, 6 and 8 years old.