Equations / Aboveground biomass
Larch aboveground biomass from DBH, AMS2 (stem + branch + foliage)
As printed (Section 3.2)
In this library's units, ready to compute (kg)
Aboveground biomass = (exp(-3.5897) * D^2.8216) + (exp(-3.1333) * D^1.8538) + (exp(-2.757) * D^1.3856)D- Diameter at breast height (1.3 m), cm
Aboveground biomass is the sum of the three AMS2 component equations as the paper describes (Section 3.2). 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
Stem −3.5897 0.1057 2.8216 0.0359
Branch −3.1333 0.1587 1.8538 0.0555
Foliage −2.757 0.1589 1.3856 0.0533
R2 0.9296 0.6627 0.6996 0.9432 (AMS2 row, Stem Branch Foliage Aboveground)
- Trees measured
- 229
- DBH range
- 2–35.7 cm
- R²
- 0.9432
- Method
- weighted NSUR (AMS2); aboveground = stem + branch + foliage
- 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 | 23 | 23 | Computed from the printed form hand-computed from the published form |
| D = 25 | 265.4 | 265.4 | Computed from the printed form hand-computed from the published form |
Related
- Chekanovsky larch AGB from DBH only, unweighted (Table 3) · Altanzagas et al. 2022 · DBH
- Chekanovsky larch AGB from DBH only, weighted (Table 3) · Altanzagas et al. 2022 · DBH
- Chekanovsky larch AGB from D²H, unweighted (Table 3) · Altanzagas et al. 2022 · DBH + Height
- Chekanovsky larch AGB from D²H, weighted (Table 3) · Altanzagas et al. 2022 · DBH + Height
- Chekanovsky larch AGB from D and H, weighted (Table 3) · Altanzagas et al. 2022 · DBH + Height
- Gmelin larch AGB from DBH only, unweighted (Table 3) · Altanzagas et al. 2022 · DBH
- Gmelin larch AGB from DBH only, weighted (Table 3) · Altanzagas et al. 2022 · DBH
- Gmelin larch AGB from D²H, unweighted (Table 3) · Altanzagas et al. 2022 · DBH + Height
- Larch aboveground biomass from DBH and height, AMS2 (stem + branch + foliage) · same paper · Aboveground biomass
- Larch branch biomass from DBH and height, AMS2 · same paper · Branch biomass
- Larch foliage biomass from DBH and height, AMS2 · same paper · Foliage biomass
- Larch stem biomass from DBH and height, AMS2 · same paper · Stem biomass