Tree Allometrics

Coprosma robusta / Height

Coprosma robusta, NZ, height from RCD (Table 3)

HeightCoprosma robusta · RubiaceaeNew ZealandplantationRead from the original paper
Photo of Coprosma robusta
© Joe Dillon · CC BY · iNaturalist
Equation

As printed (Table 3, Height, Coprosma robusta)

y = 0.453ln(x)

In this library's units, ready to compute (m)

Height = 0.453 * ln(10 * DRC)
DRC
Root collar / stem base diameter, cm

Open-spaced juvenile plants (2-year-old containerised plants on-grown for 3 years, sampled up to 5 years). The tables are headed 'at age 5 years' but the appendix figures show points from all harvest years, and the paper gives no n or RCD range for these fits, so none is recorded. x is root collar diameter in mm; biomass in g and height in m (units inferred from Table 2 and Appendix 1 means, which the equations reproduce; the paper does not print units beside the equations).

Source
0.945
R² · Table 3, Height, Coprosma robusta, r² column
R²
0.945
Method
ordinary least squares, natural log-linear through origin (y = m ln x)
Where
Taruheru River terrace, Gisborne, New Zealand
Last checked
2026-11-02
Calculate
1.36
Height (m)
Checks this equation passes

On every build, the library's form and the paper's own form (in its units) must both give these values within 1%.

InputsExpectedWe getFrom
DRC = 21.361.36Computed from the printed form
hand-computed from the published form (RCD in mm, mass in g, converted)
DRC = 61.851.85Computed from the printed form
hand-computed from the published form (RCD in mm, mass in g, converted)
DRC = 152.272.27Computed from the printed form
hand-computed from the published form (RCD in mm, mass in g, converted)

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