Equations / Aboveground biomass
Ximenia americana, total aerial dry biomass from ground-level diameter and height (Table 2)
© Douglas Goldman · CC BY-SA · iNaturalistAs printed (Table 2, p. 360)
In this library's units, ready to compute (kg)
Aboveground biomass = -2.81201 + 0.0817217 * DRC * H^2DRC- Root collar / stem base diameter, cm
H- Total tree height, m
Table 2 prints R2 as a percentage. D is diameter at ground level (DAS, 'diâmetro ao nível do solo', cm), mapped to DRC; H is total height in m; MS is dry mass in kg (Table 2 footnote). 'DH' and 'DH2' are read as D*H and D*H^2, and 'D2H' as D^2*H (variables listed on p. 358 as DAS*H, DAS*H2, DAS2*H). Total aerial dry biomass (leaves, branches, trunk). Diameter range of the sampled trees printed as 4 a 12 cm (ground-level diameter, so not entered as a DBH range): use inside that range. Equations were also fitted by diameter class for all species pooled (Table 3); those are not included here.
doi:10.4336/2013.pfb.33.76.579 · Open access · copy we read
amostrados 15 indivíduos, sendo três para cada classe de diâmetro, com exceção da espécie Chamaecrista belemii, em que foram amostrados 30 indivíduos
95,5 (R²)
- Trees measured
- 15
- R²
- 0.955
- Method
- regression; model chosen among literature models and Backward/Forward stepwise fits by residual plots, S%, t test and R2
- Where
- Casa Nova and Remanso, northern Bahia, lower-middle São Francisco (caatinga arbustivo-arbórea)
- Last checked
- 2026-11-02
The model gives a negative value for this tree, so it does not apply here.
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 |
|---|---|---|---|
| DRC = 5, H = 2 | -1.18 | -1.18 | Computed from the printed form hand-computed from the published form (coefficients as printed) |
| DRC = 8, H = 3 | 3.07 | 3.07 | Computed from the printed form hand-computed from the published form (coefficients as printed) |
| DRC = 11, H = 4 | 11.6 | 11.6 | Computed from the printed form hand-computed from the published form (coefficients as printed) |
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