# Khaya senegalensis stem biomass from Dbh

Stem biomass equation for Khaya senegalensis, Benin, from Goussanou et al. 2016. 27 trees, DBH 3.7–40.2 cm. Listed on Tree Allometrics, a free library of tree allometric equations, each quoted from the source that published it.

## Equation

As printed in Goussanou et al. 2016 (Eq. 3 and 5, p. 7; Table 4 (Model structure: ln(X) = x0 + x1ln(Dbh)), p. 10):

> K. senegalensis –2.50*** (0.16) 2.40*** (0.06) 98.56 22 0.02 25

Cite: https://treeallometry.org/equations/goussanou-2016-khaya-senegalensis-stem-biomass-d/#equation

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

```
Stem biomass = exp(-2.5 + 2.4 * ln(D) + 0.02)
```

Inputs: D = Diameter at breast height (1.3 m) (cm).
The source's own form: exp(-2.5 + 2.4 * ln(Dbh) + 0.02), with Dbh in cm; output in kg.
Cite: https://treeallometry.org/equations/goussanou-2016-khaya-senegalensis-stem-biomass-d/#canonical

## What it covers

- Output: Stem biomass, kg
- Taxon: Khaya senegalensis (species); broadleaf
- Where: Lama forest reserve, southern Benin (semi-deciduous forest). Cite: https://treeallometry.org/equations/goussanou-2016-khaya-senegalensis-stem-biomass-d/#where
- Biomes: tropical
- Stand: natural
- Trees measured: 27. Cite: https://treeallometry.org/equations/goussanou-2016-khaya-senegalensis-stem-biomass-d/#n_trees
- DBH range: 3.7–40.2 cm. Cite: https://treeallometry.org/equations/goussanou-2016-khaya-senegalensis-stem-biomass-d/#dbh
- 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-khaya-senegalensis-stem-biomass-d/#method
- Verification: read in the original source
- Last checked: 2026-11-02. Cite: https://treeallometry.org/equations/goussanou-2016-khaya-senegalensis-stem-biomass-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-khaya-senegalensis-stem-biomass-d/#source

## The facts, in the source's words

**Equation** (Eq. 3 and 5, p. 7; Table 4 (Model structure: ln(X) = x0 + x1ln(Dbh)), p. 10):

> K. senegalensis –2.50*** (0.16) 2.40*** (0.06) 98.56 22 0.02 25

Cite: https://treeallometry.org/equations/goussanou-2016-khaya-senegalensis-stem-biomass-d/#equation

**Trees measured** (Table 1, p. 5 (number of sample trees)):

> Khaya senegalensis 27 160 3.7–40.2

Cite: https://treeallometry.org/equations/goussanou-2016-khaya-senegalensis-stem-biomass-d/#quote-fit-n-trees

**Smallest DBH** (Table 1, p. 5 (Dbh range, cm)):

> Khaya senegalensis 27 160 3.7–40.2

Cite: https://treeallometry.org/equations/goussanou-2016-khaya-senegalensis-stem-biomass-d/#quote-fit-dbh-min-cm

**Our note:** Stem biomass only (stem = height to crown base); the authors say to multiply by a biomass expansion factor (IPCC 2006) to get aboveground biomass. 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. Recommended-to-capture subset: species-specific Dbh-only biomass models for six species; the paper prefers species-specific models over the generic one. 

## 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 | 111 | 111 | Computed from the printed form: computed from the published form (coefficients as printed to 2 decimals) |
| D = 40 | 586 | 586 | Computed from the printed form: computed from the published form (coefficients as printed to 2 decimals) |

Cite: https://treeallometry.org/equations/goussanou-2016-khaya-senegalensis-stem-biomass-d/#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: 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), "Khaya senegalensis stem biomass from Dbh", checked 2026-11-02, https://treeallometry.org/equations/goussanou-2016-khaya-senegalensis-stem-biomass-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-khaya-senegalensis-stem-biomass-d.json
Report a problem: email info@restorationscope.com with the equation id (goussanou-2016-khaya-senegalensis-stem-biomass-d) and where the right value appears.