# Tanzania lowland forest, Dindili and Rondo combined, total volume, D only (model 7)

Total volume equation for Mixed lowland forest tree species, Tanzania, from Mugasha et al. 2016. 60 trees. Listed on Tree Allometrics, a free library of tree allometric equations, each quoted from the source that published it.

## Equation

As printed in Mugasha et al. 2016 (Table 3 (columns: a, b, c, error, RMSE, R2, AIC)):

> Total tree volume General 7 −0.0393 0.00102 — 0.013 × dbh0.5 0.85 0.95 92.06

Cite: https://treeallometry.org/equations/mugasha-2016-volume-general-m7/#equation

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

```
Total volume = -0.0393 + 0.00102 * D^2
```

Inputs: D = Diameter at breast height (1.3 m) (cm).
The source's own form: -0.0393 + 0.00102 * DBH^2, with DBH in cm; output in m3.
Cite: https://treeallometry.org/equations/mugasha-2016-volume-general-m7/#canonical

## What it covers

- Output: Total volume, m³
- Taxon: Mixed lowland forest tree species (mixed species); broadleaf
- Where: Dindili (Morogoro) and Rondo (Lindi) lowland forests, Tanzania. Cite: https://treeallometry.org/equations/mugasha-2016-volume-general-m7/#where
- Biomes: tropical
- Stand: natural
- Trees measured: 60. Cite: https://treeallometry.org/equations/mugasha-2016-volume-general-m7/#n_trees
- R²: 0.95. Cite: https://treeallometry.org/equations/mugasha-2016-volume-general-m7/#r2
- Method: maximum-likelihood non-linear regression with variance function. Cite: https://treeallometry.org/equations/mugasha-2016-volume-general-m7/#method
- Verification: read in the original source
- Last checked: 2026-11-02. Cite: https://treeallometry.org/equations/mugasha-2016-volume-general-m7/#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

Mugasha, W.A., Mwakalukwa, E.E., Luoga, E., et al. (2016). Allometric Models for Estimating Tree Volume and Aboveground Biomass in Lowland Forests of Tanzania. International Journal of Forestry Research, 2016, 8076271.

- DOI: https://doi.org/10.1155/2016/8076271
- Access: open access
- Copy we read: https://onlinelibrary.wiley.com/doi/10.1155/2016/8076271
- Every equation from this source: https://treeallometry.org/sources/mugasha-2016/
- Cite: https://treeallometry.org/equations/mugasha-2016-volume-general-m7/#source

## The facts, in the source's words

**Equation** (Table 3 (columns: a, b, c, error, RMSE, R2, AIC)):

> Total tree volume General 7 −0.0393 0.00102 — 0.013 × dbh0.5 0.85 0.95 92.06

Cite: https://treeallometry.org/equations/mugasha-2016-volume-general-m7/#equation

**Units** (Section 2.6.2):

> where Y is the volume (m3 tree−1) or biomass (kg tree−1); WD is wood basic density (g cm−3); a, b, and c are model parameters to be estimated.

Cite: https://treeallometry.org/equations/mugasha-2016-volume-general-m7/#quote-published-units

**Trees measured** (Section 2.3):

> A total of 30 trees were selected from each site

Cite: https://treeallometry.org/equations/mugasha-2016-volume-general-m7/#quote-fit-n-trees

**Our note:** Fitted by maximum-likelihood non-linear regression with a variance function, no back-transformation. Table 3 column "R2" is stored as r2. Total volume is stem plus branches. Table 3 prints the model forms (6)-(10) as images; they were read from the rendered equations. Model (7) is Y = a + b × dbh².

## 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 | 0.369 | 0.369 | Computed from the printed form: hand-computed from the published form |
| D = 50 | 2.51 | 2.51 | Computed from the printed form: hand-computed from the published form |

Cite: https://treeallometry.org/equations/mugasha-2016-volume-general-m7/#checks

## How to cite

Cite the source for the equation: Mugasha, W.A., Mwakalukwa, E.E., Luoga, E., et al. (2016). Allometric Models for Estimating Tree Volume and Aboveground Biomass in Lowland Forests of Tanzania. International Journal of Forestry Research, 2016, 8076271. https://doi.org/10.1155/2016/8076271

Cite this page for the record and checks: Tree Allometrics (Restoration Scope), "Tanzania lowland forest, Dindili and Rondo combined, total volume, D only (model 7)", checked 2026-11-02, https://treeallometry.org/equations/mugasha-2016-volume-general-m7/. 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/mugasha-2016-volume-general-m7.json
Report a problem: email info@restorationscope.com with the equation id (mugasha-2016-volume-general-m7) and where the right value appears.