What type of study is this?

This is a Quantitative Study study.

October 5, 2025

A Modification to the Combined-Variable Formula for Computing Tree Volume

Puntos clave

The modified formula improves tree volume calculations with consistent accuracy across 11 species.
It utilizes coefficients and constants derived from the Schumacher formula to enhance computation precision.
Comparison shows the modified combined-variable formula outperforms the standard version in accuracy.
This advancement in methodology supports better volume measurement for forestry and ecological studies.

Resumen

Abstract A modified combined-variable formula for calculating total cubic-foot volumes of trees was tested on data sampled from 11 species. This formula is: V = a3 + b3Db2Hc2 where V is the total, cubic-foot volume, D is the d.b.h. (o.b.), a3 is the regression constant, b3 is the regression coefficient and b2, and c are the coefficients obtained from the logarithmic or Schumacher formula: log V = a2 + b2 log D + c2 log H Compared with the standard combined-variable formula: V = a1 + b1D2H the modified formula gave small but consistent improvements in accuracy.

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Cite This Study

R. M. Newnham (Sun,) studied this question.

synapsesocial.com/papers/68e2555bd6d66a53c2475571 https://doi.org/https://doi.org/10.1093/jof/65.10.719

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