Equations / Aboveground biomass
Five-species pooled AGB from dbh (Table 4)
The paper fits this equation and then advises against using it: “Comparison of the regression parameter homogeneity of the five species determined rejection of the null hypothesis, and thus, a single model cannot be fit satisfactorily to the database of the species involved in the present study” (Results, p. 8). Species pages list it last among fits of its kind.
Fitted on these 5 species: Acacia cochliacantha, Conzattia multiflora, Euphorbia schlechtendalii, Ipomoea arborescens, Lysiloma microphyllum
As printed (Eq. 2, p. 4)
In this library's units, ready to compute (kg)
Aboveground biomass = exp(-1.217 + 1.886 * ln(D))D- Diameter at breast height (1.3 m), cm
ln(Y) = b0 + b1 ln(DBH), natural log, no correction factor stated in the paper. Aboveground biomass includes foliage and small branches (trunk and crown sections were summed). The paper reports that the pooled model was rejected as heterogeneous; it is listed as printed. n 60 counts branch units, so n_trees is left out.
doi:10.21829/myb.2021.2742441 · Open access · copy we read
All the species: n 60; β0 -1.217; β1 1.886; R2 0.668
R2 0.668
Y is aboveground biomass (kg), X is dbh (cm)
- DBH range
- 3.5–32.9 cm
- R²
- 0.668
- Method
- Linear regression of ln(biomass) on ln(dbh)
- Where
- Sierra de Huautla Biosphere Reserve (Ejido El Limón), Morelos
- 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 = 10 | 22.8 | 22.8 | Computed from the printed form computed from the printed coefficients |
| D = 20 | 84.2 | 84.2 | Computed from the printed form computed from the printed coefficients |
Related
- Acacia cochliacantha AGB from dbh (Table 3) · same paper · Aboveground biomass
- Conzattia multiflora AGB from dbh (Table 3) · same paper · Aboveground biomass
- Lower wood density subgroup (CEI) AGB from dbh (Table 4) · same paper · Aboveground biomass
- Euphorbia schlechtendalii AGB from dbh (Table 3) · same paper · Aboveground biomass
- Ipomoea arborescens AGB from dbh (Table 3) · same paper · Aboveground biomass
- Lysiloma microphyllum AGB from dbh (Table 3) · same paper · Aboveground biomass
- High wood density subgroup (LA) AGB from dbh (Table 4) · same paper · Aboveground biomass