Equations / Aboveground biomass, without leaves
Miombo Lindi AGB from stump diameter
As printed (Table 5, selected model (1))
In this library's units, ready to compute (kg)
Aboveground biomass, without leaves = 0.02821 * D30^2.7508D30- Stem diameter at 30 cm, cm
Stump diameter (SD) is measured over bark just below the felling cut, at least 30 cm above ground (higher when the stump is irregular), so it is mapped to D30 as the nearest canonical variable. Form Y = a × SD^b is the first (non-linear mixed-effects, nlme) model form; the paper selected it as best in every case shown here, and the printed Table row shows it. AGB counts only biomass above the SD measurement point (stump excluded) and leaves were excluded from twigs, hence excludes foliage. The three model forms (1)-(3) are typeset equations; the form of (1) is read from the table row "= a × (SD) b". The fit used nlme with random effects; coefficients are the fixed effects as printed. Table 2 gives SD ranges, not DBH, so no dbh range is stored.
doi:10.1155/2019/1876329 · Open access · copy we read
SD is stump diameter (cm)
AGB and BGB models were developed from 127 and 57 sample trees, respectively
AGB Manyara 40 … Lindi 47 … Tabora 40
- Trees measured
- 47
- R²
- 0.94
- Method
- non-linear mixed-effects regression (nlme), power model
- Where
- Angai Villages Forest Reserve, Lindi, Tanzania
- Last checked
- 2026-11-02
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 |
|---|---|---|---|
| D30 = 30 | 326.3 | 326.3 | Computed from the printed form hand-computed from the published form |
| D30 = 60 | 2,197 | 2,197 | Computed from the printed form hand-computed from the published form |
Related
- Miombo Manyara AGB from stump diameter · Manyanda et al. 2019 · D30
- Miombo Regional AGB from stump diameter · Manyanda et al. 2019 · D30
- Miombo Tabora AGB from stump diameter · Manyanda et al. 2019 · D30
- Miombo Manyara AGB from stump diameter · same paper · Aboveground biomass, without leaves
- Miombo Regional AGB from stump diameter · same paper · Aboveground biomass, without leaves
- Miombo Tabora AGB from stump diameter · same paper · Aboveground biomass, without leaves
- Miombo Regional BGB from stump diameter · same paper · Root biomass
- Miombo Regional total volume from stump diameter · same paper · Total volume