Equations / Root biomass
Subtropical China root biomass from D
As printed (BGB models with diameter, p. 8)
In this library's units, ready to compute (kg)
Root biomass = exp(-2.80346 + 2.0441 * ln(D))D- Diameter at breast height (1.3 m), cm
Log-log model fitted by Bayesian MCMC; no correction factor is stated, so none is applied. Natural log assumed from the paper's ln notation. Wood density WD is in g cm-3 (Table 2; the running text says g/m3). Whole-tree AGB includes branches, leaves and fruit. Fitted on 23 excavated root systems of eight species (large roots, small roots and stump). The residual standard error given is 0.3437 on the log scale and R² is 0.9241.
doi:10.1890/es15-00198.1 · Open access · copy we read
- Trees measured
- 23
- R²
- 0.9241
- Residual SE
- 0.3437
- Method
- Bayesian log-log regression (MCMC)
- Where
- Badagongshan National Nature Reserve, Hunan province
- 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 | 6.71 | 6.71 | Computed from the printed form computed from the printed coefficients |
| D = 30 | 63.4 | 63.4 | Computed from the printed form computed from the printed coefficients |
Related
- Subtropical China AGB from D, H and wood density (Model I.1) · same paper · Aboveground biomass
- Subtropical China AGB from D²H and wood density (Model I.2) · same paper · Aboveground biomass
- Subtropical China AGB from D²H x wood density (Model I.3) · same paper · Aboveground biomass
- Subtropical China AGB from D and wood density (Model I.4) · same paper · Aboveground biomass
- Subtropical China AGB from D²H (Model III.1) · same paper · Aboveground biomass