Euterpe precatoria / Stem biomass
Euterpe precatoria stem mass from D2Hrho
As printed (Table 1 (columns lng, h, adjusted R2; model ln y = ln g + h ln x, Eq. 2))
In this library's units, ready to compute (kg)
Stem biomass = exp(-2.11) * (D^2 * Hstem * rho)^0.90D- Diameter at breast height (1.3 m), cm
Hstem- Palm stem height, ground to the lowest leaf, m
rho- Wood density (oven-dry mass / green volume), g/cm³
H is stem height from the stem base to the tip of the meristem (palm, fronds not included), mapped to canonical H. rho is the measured stem specific gravity (oven-dry mass / green volume), which the authors found rises with size, so applying this to unmeasured palms needs a rho estimate. Dry mass (fresh mass converted with component water content, dried at 65 C). SMA fit, no correction factor stated. Recommended: best predictor for Ms (adjusted R2 0.982 in Table 1). Coefficient is exp(lng) from Table 1 as printed. Not included: leaf mass (needs frond count Nf, not canonical) and root mass (Table 1 row and text disagree on the predictor). Palm height is measured from stem base to the meristem tip, fronds excluded; mapped to Hstem (closest canonical variable), not total height.
doi:10.3390/f6020450 · Open access · copy we read
We harvested twenty palms
- Trees measured
- 20
- DBH range
- 3.9–12.7 cm
- Height range
- 2.3–16.4 m
- Method
- Power function fitted on ln-ln by standardized major axis (SMA)
- Where
- Terra-firme forest at the INPA forest-management field station, ~60 km NW of Manaus, Amazonas
- Last checked
- 2026-11-02
Shaded: the DBH range the model was fitted on. Other inputs held at the values above.
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 = 8, rho = 0.4, Hstem = 10 | 17.8 | 17.8 | Computed from the printed form computed from Table 1 ln g and h |
| D = 12, rho = 0.5, Hstem = 15 | 65.1 | 65.1 | Computed from the printed form computed from Table 1 ln g and h |
Related
- Euterpe precatoria aboveground mass from D2Hrho · same paper · Aboveground biomass