# Olea europaea AGB from stump diameter DSH (M20)

Aboveground biomass equation for Olea europaea subsp. cuspidata, Ethiopia, from Tetemke et al. 2019. 16 trees. 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)):

> M20 Olea europaea 16 AGB = a × DSHb 0.125 2.279 0.948 44.7 3.1 16.3

Cite: https://treeallometry.org/equations/tetemke-2019-m20-olea-dsh/#equation

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

```
Aboveground biomass = 0.125 * D30^2.279
```

Inputs: D30 = Stem diameter at 30 cm (cm).
The source's own form: 0.125 * DSH^2.279, with DSH in cm; output in kg.
Cite: https://treeallometry.org/equations/tetemke-2019-m20-olea-dsh/#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-m20-olea-dsh/#where
- Biomes: montane, dryland
- Stand: natural
- Trees measured: 16. Cite: https://treeallometry.org/equations/tetemke-2019-m20-olea-dsh/#n_trees
- Method: Power function fitted on ln-transformed data. Cite: https://treeallometry.org/equations/tetemke-2019-m20-olea-dsh/#method
- Verification: read in the original source
- Last checked: 2026-11-02. Cite: https://treeallometry.org/equations/tetemke-2019-m20-olea-dsh/#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-m20-olea-dsh/#source

## The facts, in the source's words

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

> M20 Olea europaea 16 AGB = a × DSHb 0.125 2.279 0.948 44.7 3.1 16.3

Cite: https://treeallometry.org/equations/tetemke-2019-m20-olea-dsh/#equation

**Our note:** DSH at 0.3 m mapped to D30. Best species-specific model for Olea europaea from stump diameter. Adjusted R2 0.948. 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 |
| --- | --- | --- | --- |
| D30 = 10 | 23.8 | 23.8 | Computed from the printed form: computed from the published form |
| D30 = 25 | 192 | 192 | Computed from the printed form: computed from the published form |

Cite: https://treeallometry.org/equations/tetemke-2019-m20-olea-dsh/#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 stump diameter DSH (M20)", checked 2026-11-02, https://treeallometry.org/equations/tetemke-2019-m20-olea-dsh/. 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-m20-olea-dsh.json
Report a problem: email info@restorationscope.com with the equation id (tetemke-2019-m20-olea-dsh) and where the right value appears.