Equations / Stem biomass
Larch stem biomass from DBH and height, AMS2
As printed (Table 3, AMS2, DBH and H)
In this library's units, ready to compute (kg)
Stem biomass = exp(-4.4649) * D^1.698 * H^1.4611D- Diameter at breast height (1.3 m), cm
H- Total tree height, m
Component equation of the AMS2 system. Additive AMS2 system (aggregated, no constraint) fitted by weighted nonlinear seemingly unrelated regression, the system the authors recommend over the base model when no subsample is available for random effects. Biomass models are exp(b0) * DBH^b1 [* H^b2] with no back-transform factor (nonlinear fit). The paper also gives base model, mixed-effects, AMS1, DMS1 and DMS2 parameters (Tables 2-4), not added here.
doi:10.3390/f11020202 · Open access · copy we read
the dataset consisted of measurements on 229 larch trees using destructive biomass sampling
DBH (cm) 229 2.0 35.7 17.9 6.9
H (m) 229 3.8 27.0 16.8 5.4
R2 0.9738 (AMS2, DBH and H, stem column)
- Trees measured
- 229
- DBH range
- 2–35.7 cm
- Height range
- 3.8–27 m
- R²
- 0.9738
- Method
- weighted NSUR (AMS2)
- Where
- Heilongjiang Province, Northeast China (40 plots, 10 sites)
- 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, H = 9 | 14.2 | 14.2 | Computed from the printed form hand-computed from the published form |
| D = 25, H = 20 | 216.6 | 216.5 | Computed from the printed form hand-computed from the published form |
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