# Olea europaea AGB from DBH (M19)

Aboveground biomass equation for Olea europaea subsp. cuspidata, Ethiopia, from Tetemke et al. 2019. 16 trees, DBH 4.6–41.2 cm. Listed on Tree Allometrics, a free library of tree allometric equations, each quoted from the source that published it.

## Equation

As printed in Tetemke et al. 2019 (Table 4 (a, b, adj-R2, rRMSE, rBias, AIC)):

> M19 Olea europaea 16 AGB = a × DBHb 0.173 2.250 0.968 43.7 −11.8 8.6

Cite: https://treeallometry.org/equations/tetemke-2019-m19-olea-dbh/#equation

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

```
Aboveground biomass = 0.173 * D^2.25
```

Inputs: D = Diameter at breast height (1.3 m) (cm).
The source's own form: 0.173 * DBH^2.25, with DBH in cm; output in kg.
Cite: https://treeallometry.org/equations/tetemke-2019-m19-olea-dbh/#canonical

## What it covers

- Output: Aboveground biomass, kg
- Taxon: Olea europaea subsp. cuspidata (species), family Oleaceae; broadleaf
- Where: Desa'a dry Afromontane forest, Tigray. Cite: https://treeallometry.org/equations/tetemke-2019-m19-olea-dbh/#where
- Biomes: montane, dryland
- Stand: natural
- Trees measured: 16. Cite: https://treeallometry.org/equations/tetemke-2019-m19-olea-dbh/#n_trees
- DBH range: 4.6–41.2 cm. Cite: https://treeallometry.org/equations/tetemke-2019-m19-olea-dbh/#dbh
- Method: Power function fitted on ln-transformed data. Cite: https://treeallometry.org/equations/tetemke-2019-m19-olea-dbh/#method
- Verification: read in the original source
- Last checked: 2026-11-02. Cite: https://treeallometry.org/equations/tetemke-2019-m19-olea-dbh/#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

Tetemke, B. A., Birhane, E., Rannestad, M. M., & Eid, T. (2019). Allometric Models for Predicting Aboveground Biomass of Trees in the Dry Afromontane Forests of Northern Ethiopia. Forests, 10(12), 1114.

- DOI: https://doi.org/10.3390/f10121114
- Access: open access
- Copy we read: https://www.mdpi.com/1999-4907/10/12/1114/htm
- Every equation from this source: https://treeallometry.org/sources/tetemke-2019/
- Cite: https://treeallometry.org/equations/tetemke-2019-m19-olea-dbh/#source

## The facts, in the source's words

**Equation** (Table 4 (a, b, adj-R2, rRMSE, rBias, AIC)):

> M19 Olea europaea 16 AGB = a × DBHb 0.173 2.250 0.968 43.7 −11.8 8.6

Cite: https://treeallometry.org/equations/tetemke-2019-m19-olea-dbh/#equation

**Smallest DBH** (Table 1 (n, DSH mean and range, DBH mean and range)):

> Olea europaea L. subsp. Cuspidata (Wall. ex DC.) Ciffieri 16 21.6 5.1–47.3 19.3 4.6–41.2

Cite: https://treeallometry.org/equations/tetemke-2019-m19-olea-dbh/#quote-fit-dbh-min-cm

**Our note:** Best species-specific model for Olea europaea with a single diameter predictor. Adjusted R2 0.968. The fits were done on ln-transformed data and the paper says predictions were back-transformed with a correction factor (CF from RSE) for its error statistics, but it does not print the CF or say whether the tabulated a already includes it; no cf is entered. Adjusted R2 is given in the notes, not fit.r2, because it is adjusted.

## 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 = 10 | 30.8 | 30.8 | Computed from the printed form: computed from the published form |
| D = 25 | 242 | 242 | Computed from the printed form: computed from the published form |

Cite: https://treeallometry.org/equations/tetemke-2019-m19-olea-dbh/#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: Tetemke, B. A., Birhane, E., Rannestad, M. M., & Eid, T. (2019). Allometric Models for Predicting Aboveground Biomass of Trees in the Dry Afromontane Forests of Northern Ethiopia. Forests, 10(12), 1114. https://doi.org/10.3390/f10121114

Cite this page for the record and checks: Tree Allometrics (Restoration Scope), "Olea europaea AGB from DBH (M19)", checked 2026-11-02, https://treeallometry.org/equations/tetemke-2019-m19-olea-dbh/. 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/tetemke-2019-m19-olea-dbh.json
Report a problem: email info@restorationscope.com with the equation id (tetemke-2019-m19-olea-dbh) and where the right value appears.