# Acacia cochliacantha AGB from dbh (Table 3)

Aboveground biomass equation for Acacia cochliacantha, Mexico, from Gómez et al. 2021. DBH 3.5–12 cm. Listed on Tree Allometrics, a free library of tree allometric equations, each quoted from the source that published it.

## Equation

As printed in Gómez et al. 2021 (Eq. 2, p. 4):

> ln(Y) = ln(a) + b ln(X)

Cite: https://treeallometry.org/equations/gomez-2021-a-cochliacantha/#equation

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

```
Aboveground biomass = exp(-1.291 + 2.178 * ln(D))
```

Inputs: D = Diameter at breast height (1.3 m) (cm).
The source's own form: exp(-1.291 + 2.178 * ln(DBH)), with DBH in cm; output in kg.
Cite: https://treeallometry.org/equations/gomez-2021-a-cochliacantha/#canonical

## What it covers

- Output: Aboveground biomass, kg
- Taxon: Acacia cochliacantha (species), family Fabaceae; broadleaf
- Where: Sierra de Huautla Biosphere Reserve (Ejido El Limón), Morelos. Cite: https://treeallometry.org/equations/gomez-2021-a-cochliacantha/#where
- Biomes: tropical, dryland
- Stand: natural
- DBH range: 3.5–12 cm. Cite: https://treeallometry.org/equations/gomez-2021-a-cochliacantha/#dbh
- R²: 0.89. Cite: https://treeallometry.org/equations/gomez-2021-a-cochliacantha/#r2
- Method: Linear regression of ln(biomass) on ln(dbh). Cite: https://treeallometry.org/equations/gomez-2021-a-cochliacantha/#method
- Verification: read in the original source
- Last checked: 2026-11-02. Cite: https://treeallometry.org/equations/gomez-2021-a-cochliacantha/#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

Gómez, J.D., Etchevers, J.D., Campo, J., Monterroso, A.I., Paustian, K., Asensio, C. (2021). Allometric relationships to estimate aboveground biomass of species in a tropical dry forest of Central Mexico. Madera y Bosques, 27(4), e2742441.

- DOI: https://doi.org/10.21829/myb.2021.2742441
- Access: open access
- Copy we read: https://myb.ojs.inecol.mx/index.php/myb/article/download/2441/2274
- Every equation from this source: https://treeallometry.org/sources/gomez-2021/
- Cite: https://treeallometry.org/equations/gomez-2021-a-cochliacantha/#source

## The facts, in the source's words

**Equation** (Eq. 2, p. 4):

> ln(Y) = ln(a) + b ln(X)

Cite: https://treeallometry.org/equations/gomez-2021-a-cochliacantha/#equation

**Equation** (Table 3, p. 7):

> Acacia cochliacantha: n 8(26)*; β0 -1.291; β1 2.178; R2 0.89

Cite: https://treeallometry.org/equations/gomez-2021-a-cochliacantha/#quote-expression

**R²** (Table 3, p. 7):

> R2 0.89

Cite: https://treeallometry.org/equations/gomez-2021-a-cochliacantha/#quote-fit-r2

**Output** (p. 4):

> Y is aboveground biomass (kg), X is dbh (cm)

Cite: https://treeallometry.org/equations/gomez-2021-a-cochliacantha/#quote-output

**Our note:** ln(Y) = b0 + b1 ln(DBH), natural log, no correction factor stated in the paper. Aboveground biomass includes foliage and small branches (trunk and crown sections were summed). The paper lists n as 8(26)* (the starred figure counts individual branches treated as units); n_trees is therefore left out and the dbh range is that of Table 1.

## 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 | 41.4 | 41.4 | Computed from the printed form: computed from the printed coefficients |
| D = 20 | 187 | 187 | Computed from the printed form: computed from the printed coefficients |

Cite: https://treeallometry.org/equations/gomez-2021-a-cochliacantha/#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: Gómez, J.D., Etchevers, J.D., Campo, J., Monterroso, A.I., Paustian, K., Asensio, C. (2021). Allometric relationships to estimate aboveground biomass of species in a tropical dry forest of Central Mexico. Madera y Bosques, 27(4), e2742441. https://doi.org/10.21829/myb.2021.2742441

Cite this page for the record and checks: Tree Allometrics (Restoration Scope), "Acacia cochliacantha AGB from dbh (Table 3)", checked 2026-11-02, https://treeallometry.org/equations/gomez-2021-a-cochliacantha/. 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/gomez-2021-a-cochliacantha.json
Report a problem: email info@restorationscope.com with the equation id (gomez-2021-a-cochliacantha) and where the right value appears.