Equations / Aboveground biomass
Subtropical China AGB from D and wood density (Model I.4)
Fitted on these 3 species and others the paper does not name here: Fagus lucida, Castanea seguinii, Carpinus viminea
As printed (Recommended model when height is not available, p. 7 (Table 2, model I.4))
In this library's units, ready to compute (kg)
Aboveground biomass = exp(-1.8226 + 2.4105 * ln(D) + 0.5781 * ln(rho))D- Diameter at breast height (1.3 m), cm
rho- Wood density (oven-dry mass / green volume), g/cm³
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. Recommended by the authors when height is not available. Coefficients are the more precise values printed in the recommended-model equation (Table 2 gives -1.823, 2.411, 0.578).
doi:10.1890/es15-00198.1 · Open access · copy we read
I.4 R² 0.932 RSE 0.207
we harvested and weighted dry mass of 147 trees from 41 dominant species in subtropical forest
- Trees measured
- 147
- R²
- 0.932
- Residual SE
- 0.207
- 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 = 20, rho = 0.57 | 160 | 160 | Computed from the printed form computed from the printed coefficients |
| D = 40, rho = 0.6 | 875 | 875 | Computed from the printed form computed from the printed coefficients |
Related
- Subtropical China AGB from D, H and wood density (Model I.1) · Xu et al. 2015 · DBH + Height + Wood density
- Subtropical China AGB from D²H and wood density (Model I.2) · Xu et al. 2015 · DBH + Height + Wood density
- Subtropical China AGB from D²H x wood density (Model I.3) · Xu et al. 2015 · DBH + Height + Wood density
- Subtropical China AGB from D²H (Model III.1) · Xu et al. 2015 · DBH + Height
- Subtropical China root biomass from D · same paper · Root biomass
- 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 D²H (Model III.1) · same paper · Aboveground biomass