Equations / Aboveground biomass

Mopane total AGB from D and H (TM2)

Aboveground biomassColophospermum mopane · FabaceaeMozambiquenaturalRead from the original paper

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Equation

As printed (Table 3, model ID 2 (this study), p. 7)

Y = exp (– 2.280 + 1.917ln(D) + 0.757 ln(H))

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

Aboveground biomass = exp(-2.280 + 1.917 * ln(D) + 0.757 * ln(H))

D: Diameter at breast height (1.3 m), cm
H: Total tree height, m

Model 2 (D and H). Total aboveground biomass is the sum of stem, branches (min. 3 cm) and foliage, so leaves are included. The printed intercept is ln(a); no back-transformation correction factor is stated in the paper and none is applied. n = 120 sampled trees (Methods p. 3, Table 3), but Table 5 heads the total-AGB column 'n = 84', so the fitted n may be 84.

Source

Lisboa, S.N., Macôo, S., Sitoe, A.A. (2025). Allometric equations for estimating above and belowground biomass of Colophospermum mopane in Mozambique. Scientific Reports, 15, 3464.

doi:10.1038/s41598-025-87297-w · Open access · copy we read

120 individuals of C. mopane

Trees measured · Methods, Forest inventory and destructive sampling, p. 3

D range (cm) 5–109

Largest DBH · Table 3, row ID 1 (this study), p. 7

Total tree height (m) 4.0 9.3 21.6 52 / 3.8 8.3 14.6 32

h max m · Table 4 (Mabalane and Tambara rows; min and max combined), p. 8

TM2 ... R-square 95.91

R² · Table 7, model TM2, p. 10 (printed as a percentage)

Trees measured: 120
DBH range: 5–109 cm
Height range: 3.8–21.6 m
R²: 0.9591
Method: log-linear OLS regression (ln Y = ln a + b ln D + c ln H)
Where: Mabalane (Gaza) and Tambara (Manica) districts, mopane woodland
Last checked: 2026-11-01

Calculate

DBH (cm)Height (m)

Height from

168.4

Aboveground biomass (kg)

79.13

Carbon (kg), ×0.47

290.1

CO₂e (kg), ×44/12

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 = 20, H = 9	168.4	168.4	Computed from the printed form computed from the published form

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Mopane total AGB from D (TM1) · Lisboa et al. 2025 · DBH
Mopane total AGB from D²H (TM3) · Lisboa et al. 2025 · DBH + Height
Mopane height from D (power H-D model) · same paper · Height
Mopane root biomass from D (RM1) · same paper · Root biomass
Mopane root biomass from D²H (RM3) · same paper · Root biomass
Mopane total AGB from D (TM1) · same paper · Aboveground biomass
Mopane total AGB from D²H (TM3) · same paper · Aboveground biomass

Compare these curves

Mopane total AGB from D and H (TM2)

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