Tree Allometrics

Equations / Aboveground biomass

Caesalpinia pyramidalis, caatinga, ground-level diameter

Aboveground biomassCaesalpinia pyramidalisBrazilnaturalRead from the original paper
Photo of Caesalpinia pyramidalis
© Matt Lavin · CC BY · iNaturalist
Equation

As printed (Table 2, p. 938)

C. pyramidalis: 0.2804*DGL1.9274 R2 0.9015

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

Aboveground biomass = 0.2804 * DRC^1.9274
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 0.9015
R² · Table 2, p. 938
Each species was represented by 30 individuals
Trees measured · Material and methods, p. 936
Trees measured
30
R²
0.9015
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
6.237
Aboveground biomass (kg)
2.931
Carbon (kg), ×0.47
10.75
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 = 56.246.24Computed from the printed form
hand-computed from the published form
DRC = 1551.851.8Computed from the printed form
hand-computed from the published form

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