# Acacia mearnsii belowground biomass from D and H (Table 3, model 3)

Root biomass equation for Acacia mearnsii, Ethiopia, from Shumie et al. 2024. 24 trees, DBH 1.1–11.9 cm. Listed on Tree Allometrics, a free library of tree allometric equations, each quoted from the source that published it.

## Equation

As printed in Shumie et al. 2024 (Conclusion, and Figure 3 caption (BGB = 0.01D2.57 H0.09)):

> 0.01D2.57H0.09

Cite: https://treeallometry.org/equations/shumie-2024-bgb/#equation

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

```
Root biomass = 0.01 * D^2.57 * H^0.09
```

Inputs: D = Diameter at breast height (1.3 m) (cm); H = Total tree height (m).
The source's own form: 0.01 * D^2.57 * H^0.09, with D in cm, H in m; output in kg.
Cite: https://treeallometry.org/equations/shumie-2024-bgb/#canonical

## What it covers

- Output: Root biomass, kg
- Taxon: Acacia mearnsii (species), family Fabaceae; broadleaf
- Where: Farmer-managed woodlots, northwestern Ethiopia (Amhara). Cite: https://treeallometry.org/equations/shumie-2024-bgb/#where
- Biomes: tropical, montane
- Stand: plantation
- Trees measured: 24. Cite: https://treeallometry.org/equations/shumie-2024-bgb/#n_trees
- DBH range: 1.1–11.9 cm. Cite: https://treeallometry.org/equations/shumie-2024-bgb/#dbh
- Height range: 2.1–6.8 m. Cite: https://treeallometry.org/equations/shumie-2024-bgb/#height
- R²: 0.9241. Cite: https://treeallometry.org/equations/shumie-2024-bgb/#r2
- Method: nonlinear regression, form a D^b H^c. Cite: https://treeallometry.org/equations/shumie-2024-bgb/#method
- Verification: read in the original source
- Last checked: 2026-11-02. Cite: https://treeallometry.org/equations/shumie-2024-bgb/#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

Shumie, A., Alemu, A., Abebe, G., et al. (2024). Allometric equations for estimation of above- and below-ground biomass of Acacia mearnsii in northwestern Ethiopia. Forest Science and Technology, 20(3), 279-285.

- DOI: https://doi.org/10.1080/21580103.2024.2366831
- Access: open access
- Copy we read: https://www.tandfonline.com/doi/full/10.1080/21580103.2024.2366831
- Every equation from this source: https://treeallometry.org/sources/shumie-2024/
- Cite: https://treeallometry.org/equations/shumie-2024-bgb/#source

## The facts, in the source's words

**Equation** (Conclusion, and Figure 3 caption (BGB = 0.01D2.57 H0.09)):

> 0.01D2.57H0.09

Cite: https://treeallometry.org/equations/shumie-2024-bgb/#equation

**R²** (Table 3 (CSV rows)):

> Below ground biomass 3. aDbHc 0.01 2.57 0.09 92.41

Cite: https://treeallometry.org/equations/shumie-2024-bgb/#quote-fit-r2

**Trees measured** (Abstract):

> twenty-four trees of varying ages (3, 4, 5, and 6 years) were harvested

Cite: https://treeallometry.org/equations/shumie-2024-bgb/#quote-fit-n-trees

**Our note:** Coefficient a is printed as 0.01 (two decimals), so predictions are coarse. D in cm, H in m, biomass in kg. Trees aged 3 to 6 years. R2 printed as 92.41 percent. Root biomass sampled as total root dry weight (coarse, medium and fine roots).

## 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 |
| --- | --- | --- | --- |
| D = 3, H = 2.5 | 0.183 | 0.183 | Computed from the printed form: computed from the published form |
| D = 7, H = 4.4 | 1.7 | 1.7 | Computed from the printed form: computed from the published form |
| D = 11, H = 6.5 | 5.62 | 5.62 | Computed from the printed form: computed from the published form |

Cite: https://treeallometry.org/equations/shumie-2024-bgb/#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: Shumie, A., Alemu, A., Abebe, G., et al. (2024). Allometric equations for estimation of above- and below-ground biomass of Acacia mearnsii in northwestern Ethiopia. Forest Science and Technology, 20(3), 279-285. https://doi.org/10.1080/21580103.2024.2366831

Cite this page for the record and checks: Tree Allometrics (Restoration Scope), "Acacia mearnsii belowground biomass from D and H (Table 3, model 3)", checked 2026-11-02, https://treeallometry.org/equations/shumie-2024-bgb/. 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/shumie-2024-bgb.json
Report a problem: email info@restorationscope.com with the equation id (shumie-2024-bgb) and where the right value appears.