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

HeightMixed tree species, Wetland forestsTanzanianaturalRead from the original paper

Many species, no single photo

Equation

As printed (Table 4, Wetlands row)

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

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

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

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

Source

Number of trees 97

Trees measured · Table 1, H, Wetlands column

Trees measured: 97
DBH range: 2.2–93 cm
Height range: 2–25 m
Method: nonlinear mixed-effects regression (random effect on cluster), Ratkowsky form
Where: Tanzania Mainland, NAFORMA inventory (Wetland forests)
Last checked: 2026-11-02

Calculate

DBH (cm)

4.15

Height (m)

Shaded: the DBH range the model was fitted on. Other inputs held at the values above.

Checks this equation passes

On every build, the library's form and the paper'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)

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