# Generic stem volume from Dbh (Lama forest)

Stem volume equation for Eighteen dominant tree species of Lama forest plus species from Guendehou et al. (2012), Benin, from Goussanou et al. 2016. 617 trees. Listed on Tree Allometrics, a free library of tree allometric equations, each quoted from the source that published it.

## Equation

As printed in Goussanou et al. 2016 (Eq. 3 and 5, p. 7; Table 3 (Model structure: ln(V) = x0 + x1ln(Dbh)), p. 9):

> Generic –1.48*** (0.04) 2.29*** (0.01) 97.51 32 0.05 615

Cite: https://treeallometry.org/equations/goussanou-2016-generic-stem-volume-d/#equation

In this library's units, ready to compute (stem volume in m³):

```
Stem volume = 0.001 * exp(-1.48 + 2.29 * ln(D) + 0.05)
```

Inputs: D = Diameter at breast height (1.3 m) (cm).
The source's own form: exp(-1.48 + 2.29 * ln(Dbh) + 0.05), with Dbh in cm; output in dm3.
Cite: https://treeallometry.org/equations/goussanou-2016-generic-stem-volume-d/#canonical

## What it covers

- Output: Stem volume, m³
- Taxon: Eighteen dominant tree species of Lama forest plus species from Guendehou et al. (2012) (mixed species); broadleaf
- Where: Lama forest reserve, southern Benin (semi-deciduous forest). Cite: https://treeallometry.org/equations/goussanou-2016-generic-stem-volume-d/#where
- Biomes: tropical
- Stand: natural
- Trees measured: 617. Cite: https://treeallometry.org/equations/goussanou-2016-generic-stem-volume-d/#n_trees
- Method: ln-ln linear regression, back-transformed with exp(σ²/2) (printed σ²/2 is rounded to 2 decimals). Cite: https://treeallometry.org/equations/goussanou-2016-generic-stem-volume-d/#method
- Verification: read in the original source
- Last checked: 2026-11-02. Cite: https://treeallometry.org/equations/goussanou-2016-generic-stem-volume-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

Goussanou, C.A., Guendehou, S., Assogbadjo, A.E., Kaire, M., Sinsin, B., Cuni-Sanchez, A. (2016). Specific and generic stem biomass and volume models of tree species in a West African tropical semi-deciduous forest. Silva Fennica, 50(2), article id 1474.

- DOI: https://doi.org/10.14214/sf.1474
- Access: open access
- Copy we read: https://silvafennica.fi/pdf/1474
- Every equation from this source: https://treeallometry.org/sources/goussanou-2016/
- Cite: https://treeallometry.org/equations/goussanou-2016-generic-stem-volume-d/#source

## The facts, in the source's words

**Equation** (Eq. 3 and 5, p. 7; Table 3 (Model structure: ln(V) = x0 + x1ln(Dbh)), p. 9):

> Generic –1.48*** (0.04) 2.29*** (0.01) 97.51 32 0.05 615

Cite: https://treeallometry.org/equations/goussanou-2016-generic-stem-volume-d/#equation

**Trees measured** (Section 2.3, p. 7):

> This resulted in 617 trees used for the generic volume and biomass models.

Cite: https://treeallometry.org/equations/goussanou-2016-generic-stem-volume-d/#quote-fit-n-trees

**Our note:** Total stem volume (stem = height to crown base), not whole-tree volume. Paper unit is 10^-3 m3 (= dm3); canonical expression converts to m3. Coefficients are printed to 2 decimals, so predictions are only as precise as that. σ²/2 is the paper's printed bias-correction term, added inside the exponent (Eq. 5); it is printed rounded to 2 decimals. Adjusted R² 97.51%, rRMSE 32% (Table 3). Fitted on 617 trees (this study plus Guendehou et al. 2012). 

## 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 = 20 | 0.228 | 0.228 | Computed from the printed form: computed from the published form (coefficients as printed to 2 decimals) |
| D = 40 | 1.12 | 1.12 | Computed from the printed form: computed from the published form (coefficients as printed to 2 decimals) |

Cite: https://treeallometry.org/equations/goussanou-2016-generic-stem-volume-d/#checks

## How to cite

Cite the source for the equation: Goussanou, C.A., Guendehou, S., Assogbadjo, A.E., Kaire, M., Sinsin, B., Cuni-Sanchez, A. (2016). Specific and generic stem biomass and volume models of tree species in a West African tropical semi-deciduous forest. Silva Fennica, 50(2), article id 1474. https://doi.org/10.14214/sf.1474

Cite this page for the record and checks: Tree Allometrics (Restoration Scope), "Generic stem volume from Dbh (Lama forest)", checked 2026-11-02, https://treeallometry.org/equations/goussanou-2016-generic-stem-volume-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/goussanou-2016-generic-stem-volume-d.json
Report a problem: email info@restorationscope.com with the equation id (goussanou-2016-generic-stem-volume-d) and where the right value appears.