Tree Allometrics

Equations / Aboveground biomass

Nine caatinga species, DGL x height

Aboveground biomassNine caatinga species, all but Cereus jamacaruBrazilnaturalRead from the original paper
Many species, no single photo
Equation

As printed (Table 2, p. 938)

All but C. jamacaru: 0.0292*(DGL*H)1.6371 R2 0.9382

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

Aboveground biomass = 0.0292 * (DRC * H)^1.6371
DRC
Root collar / stem base diameter, cm
H
Total tree height, m

Table 2 prints each equation as a*DGL^b or a*DBH^b with the exponent as superscript (flattened here with ^). Biomass is oven-dry aboveground plant biomass in kg (Table 2 title), diameters in cm. Wood dried at 60 C. Plants were cut at the base and the stump was included in the weighed biomass. Perimeters were converted to diameters assuming a circular shape; for branching below measuring height, branch areas were summed into one equivalent diameter. DGL is stem diameter at ground level, mapped to DRC. Group equation; n not stated for the group and left out. H is total plant height (m), including the stump.

Source
R2 0.9382
R² · Table 2, p. 938
R²
0.9382
Method
power equation B = a*(x*H)^b (oven-dry aboveground biomass, kg)
Where
Santaluz (Bahia) and Petrolina (Pernambuco), Depressão Sertaneja, Brazilian semiarid
Last checked
2026-11-02
Calculate
Height from
3.94
Aboveground biomass (kg)
1.85
Carbon (kg), ×0.47
6.79
CO₂e (kg), ×44/12
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%.

InputsExpectedWe getFrom
DRC = 5, H = 43.943.94Computed from the printed form
hand-computed from the published form
DRC = 15, H = 759.559.5Computed from the printed form
hand-computed from the published form

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