# Melicytus ramiflorus (Limestone Downs): AGB from D (Table 7)

Aboveground biomass equation for Melicytus ramiflorus, New Zealand, from Wangui et al. 2026. 9 trees. Listed on Tree Allometrics, a free library of tree allometric equations, each quoted from the source that published it.

## Equation

As printed in Wangui et al. 2026 (Table 7):

> M. ramiflorus Limestone Downs ln(AGB) =ln (a)+b×ln(D) -2.80**** 1.74**** … CF 1.17

Cite: https://treeallometry.org/equations/wangui-2026-agb-melicytus-ramiflorus-ld-d/#equation

In this library's units, ready to compute (aboveground biomass in kg):

```
Aboveground biomass = 1.17 * exp(-2.8 + 1.74 * ln(DRC))
```

Inputs: DRC = Root collar / stem base diameter (cm).
The source's own form: 1.17 * exp(-2.8 + 1.74 * ln(D)), with D in cm; output in kg.
Cite: https://treeallometry.org/equations/wangui-2026-agb-melicytus-ramiflorus-ld-d/#canonical

## What it covers

- Output: Aboveground biomass, kg
- Taxon: Melicytus ramiflorus (species), family Violaceae; shrub
- Where: Limestone Downs, Waikato west coast. Cite: https://treeallometry.org/equations/wangui-2026-agb-melicytus-ramiflorus-ld-d/#where
- Biomes: temperate
- Stand: mixed
- Trees measured: 9. Cite: https://treeallometry.org/equations/wangui-2026-agb-melicytus-ramiflorus-ld-d/#n_trees
- Correction factor: 1.17 (applied). Cite: https://treeallometry.org/equations/wangui-2026-agb-melicytus-ramiflorus-ld-d/#cf
- Method: OLS regression on natural logarithms (power form), back-transformed with correction factor CF = exp(RSE^2/2). Cite: https://treeallometry.org/equations/wangui-2026-agb-melicytus-ramiflorus-ld-d/#method
- Verification: read in the original source
- Last checked: 2026-11-02. Cite: https://treeallometry.org/equations/wangui-2026-agb-melicytus-ramiflorus-ld-d/#checked_at

A missing fit statistic is one the source doesn't state, or that we haven't recorded; it is never estimated. Outside the stated DBH range or region, the equation is an extrapolation.

## Source

Wangui, J. C., Pain, S. J., Kenyon, P. R., Tozer, P. R., & Millner, J. P. (2026). Biomass and carbon estimation for three browsable native shrubs in New Zealand. New Zealand Journal of Forestry Science, 56, 16.

- DOI: https://doi.org/10.33494/nzjfs562026x567x
- Access: open access
- Copy we read: https://nzjforestryscience.nz/index.php/nzjfs/article/download/567/153
- Every equation from this source: https://treeallometry.org/sources/wangui-2026/
- Cite: https://treeallometry.org/equations/wangui-2026-agb-melicytus-ramiflorus-ld-d/#source

## The facts, in the source's words

**Equation** (Table 7):

> M. ramiflorus Limestone Downs ln(AGB) =ln (a)+b×ln(D) -2.80**** 1.74**** … CF 1.17

Cite: https://treeallometry.org/equations/wangui-2026-agb-melicytus-ramiflorus-ld-d/#equation

**Correction factor** (Methods, Equation 2; Table 7):

> CF = e(RSE²/2)  Equation 2; Table 7 CF column 1.17

Cite: https://treeallometry.org/equations/wangui-2026-agb-melicytus-ramiflorus-ld-d/#quote-fit-cf

**Our note:** AGB is the sum of stem, branch and foliage dry biomass of the shrub. Natural log. D is the basal stem diameter over bark about 10 cm above ground (multi-stemmed shrubs: square root of the sum of stem diameters), mapped to DRC; H is total height in m. Table 7 reports adjusted R2 = 0.799 and RMSE = 0.488 (not used as r2 or rse). Shrubs had basal diameter up to 10 cm (mean D 3.4 to 3.8 cm by species, Table 4); the paper prints no D range for these models. The CF column is the factor the paper applies to back-transformed predictions.

## Checks this equation passes

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

| Inputs | Expected | We get | From |
| --- | --- | --- | --- |
| DRC = 2 | 0.238 | 0.238 | Computed from the printed form: computed from the published form (a is ln(a), CF applied, coefficients as printed) |
| DRC = 4 | 0.794 | 0.794 | Computed from the printed form: computed from the published form (a is ln(a), CF applied, coefficients as printed) |
| DRC = 8 | 2.65 | 2.65 | Computed from the printed form: computed from the published form (a is ln(a), CF applied, coefficients as printed) |

Cite: https://treeallometry.org/equations/wangui-2026-agb-melicytus-ramiflorus-ld-d/#checks

The calculator on the page shows carbon as biomass × 0.47 (IPCC 2006 Guidelines, Vol. 4, Ch. 4, Table 4.3) and CO₂e as carbon × 44/12.

## How to cite

Cite the source for the equation: Wangui, J. C., Pain, S. J., Kenyon, P. R., Tozer, P. R., & Millner, J. P. (2026). Biomass and carbon estimation for three browsable native shrubs in New Zealand. New Zealand Journal of Forestry Science, 56, 16. https://doi.org/10.33494/nzjfs562026x567x

Cite this page for the record and checks: Tree Allometrics (Restoration Scope), "Melicytus ramiflorus (Limestone Downs): AGB from D (Table 7)", checked 2026-11-02, https://treeallometry.org/equations/wangui-2026-agb-melicytus-ramiflorus-ld-d/. Data CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Quotes are the authors' words.

Data for this equation: https://treeallometry.org/data/equations/wangui-2026-agb-melicytus-ramiflorus-ld-d.json
Report a problem: email info@restorationscope.com with the equation id (wangui-2026-agb-melicytus-ramiflorus-ld-d) and where the right value appears.