Tree Allometrics

Equations / Aboveground biomass

Small caatinga species (A. pyrifolium, C. sonderianus, J. mollissima), ground-level diameter

Aboveground biomassSmall caatinga species (A. pyrifolium, C. sonderianus, J. mollissima)BrazilnaturalRead from the original paper
Many species, no single photo
Equation

As printed (Table 2, p. 938)

Small species (top 3): 0.0644*DGL2.1999 R2 0.8467

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

Aboveground biomass = 0.0644 * DRC^2.1999
DRC
Root collar / stem base diameter, cm

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.

Source
R2 0.8467
R² · Table 2, p. 938
R²
0.8467
Method
power equation B = a*x^b (oven-dry aboveground biomass, kg)
Where
Santaluz (Bahia) and Petrolina (Pernambuco), Depressão Sertaneja, Brazilian semiarid
Last checked
2026-11-02
Calculate
2.22
Aboveground biomass (kg)
1.04
Carbon (kg), ×0.47
3.83
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 = 52.222.22Computed from the printed form
hand-computed from the published form
DRC = 1524.924.9Computed from the printed form
hand-computed from the published form

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