Tree Allometrics

Equations / Aboveground biomass

Jatropha mollissima, caatinga, ground-level diameter

Aboveground biomassJatropha mollissimaBrazilnaturalRead from the original paper
Photo of Jatropha mollissima
© Breno Figueiredo · CC BY · iNaturalist
Equation

As printed (Table 2, p. 938)

J. mollissima: 0.0689*DGL2.0557 R2 0.7668

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

Aboveground biomass = 0.0689 * DRC^2.0557
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.

Source
R2 0.7668
R² · Table 2, p. 938
Each species was represented by 30 individuals
Trees measured · Material and methods, p. 936
Trees measured
30
R²
0.7668
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
1.884
Aboveground biomass (kg)
0.886
Carbon (kg), ×0.47
3.247
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 = 51.881.88Computed from the printed form
hand-computed from the published form
DRC = 151818Computed from the printed form
hand-computed from the published form

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