# Tanzania Wetland forests, height from D (base model, Table 4)

Height equation for Mixed tree species, Wetland forests, Tanzania, from Mugasha et al. 2019. 97 trees, DBH 2.2–93 cm. 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. 2019 (Table 4, Wetlands row):

> 1.3 + 20.4098 × exp(−23.1909/(D + 6.7727))

Cite: https://treeallometry.org/equations/mugasha-2019-h-wetlands/#equation

In this library's units, ready to compute (height in m):

```
Height = 1.3 + 20.4098 * exp(-23.1909 / (D + 6.7727))
```

Inputs: D = Diameter at breast height (1.3 m) (cm).
The source's own form: 1.3 + 20.4098 * exp(-23.1909 / (DBH + 6.7727)), with DBH in cm; output in m.
Cite: https://treeallometry.org/equations/mugasha-2019-h-wetlands/#canonical

## What it covers

- Output: Height, m
- Taxon: Mixed tree species, Wetland forests (mixed species); mixed
- Where: Tanzania Mainland, NAFORMA inventory (Wetland forests). Cite: https://treeallometry.org/equations/mugasha-2019-h-wetlands/#where
- Biomes: tropical
- Stand: natural
- Trees measured: 97. Cite: https://treeallometry.org/equations/mugasha-2019-h-wetlands/#n_trees
- DBH range: 2.2–93 cm. Cite: https://treeallometry.org/equations/mugasha-2019-h-wetlands/#dbh
- Height range: 2–25 m. Cite: https://treeallometry.org/equations/mugasha-2019-h-wetlands/#height
- Method: nonlinear mixed-effects regression (random effect on cluster), Ratkowsky form. Cite: https://treeallometry.org/equations/mugasha-2019-h-wetlands/#method
- Verification: read in the original source
- Last checked: 2026-11-02. Cite: https://treeallometry.org/equations/mugasha-2019-h-wetlands/#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., Mauya, E.W., Njana, A.M., et al. (2019). Height-Diameter Allometry for Tree Species in Tanzania Mainland. International Journal of Forestry Research, 2019, 4832849.

- DOI: https://doi.org/10.1155/2019/4832849
- Access: open access
- Copy we read: https://onlinelibrary.wiley.com/doi/10.1155/2019/4832849
- Every equation from this source: https://treeallometry.org/sources/mugasha-2019/
- Cite: https://treeallometry.org/equations/mugasha-2019-h-wetlands/#source

## The facts, in the source's words

**Equation** (Table 4, Wetlands row):

> 1.3 + 20.4098 × exp(−23.1909/(D + 6.7727))

Cite: https://treeallometry.org/equations/mugasha-2019-h-wetlands/#equation

**Trees measured** (Table 1, H, Wetlands column):

> Number of trees 97

Cite: https://treeallometry.org/equations/mugasha-2019-h-wetlands/#quote-fit-n-trees

**Our note:** Base model (D only), Ratkowsky form selected for wetlands (Table 4). n_trees and ranges are the Table 1 statistics for wetlands.

## 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 = 5 | 4.15 | 4.15 | Computed from the printed form: computed from the published form (coefficients as printed) |
| D = 20 | 9.88 | 9.88 | Computed from the printed form: computed from the published form (coefficients as printed) |
| D = 50 | 14.9 | 14.9 | Computed from the printed form: computed from the published form (coefficients as printed) |

Cite: https://treeallometry.org/equations/mugasha-2019-h-wetlands/#checks

## How to cite

Cite the source for the equation: Mugasha, W.A., Mauya, E.W., Njana, A.M., et al. (2019). Height-Diameter Allometry for Tree Species in Tanzania Mainland. International Journal of Forestry Research, 2019, 4832849. https://doi.org/10.1155/2019/4832849

Cite this page for the record and checks: Tree Allometrics (Restoration Scope), "Tanzania Wetland forests, height from D (base model, Table 4)", checked 2026-11-02, https://treeallometry.org/equations/mugasha-2019-h-wetlands/. 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-2019-h-wetlands.json
Report a problem: email info@restorationscope.com with the equation id (mugasha-2019-h-wetlands) and where the right value appears.