Equations / Aboveground biomass
Guangzhou subtropical forest aboveground biomass, Model 3 (DBH and height)
Aboveground biomassSubtropical evergreen broadleaf forest trees (Castanopsis fissa, Aleurites montana, Castanopsis chinensis, Machilus chinensis and 22 companion species)ChinanaturalRead from the original paper
Many species, no single photo
Equation
As printed (Section 2.4, Eq. 3)
ln(B) = a + bln(DBH²) + cln(H)
In this library's units, ready to compute (kg)
Aboveground biomass = exp(-2.275 + 1.161 * ln(D^2) + 0.152 * ln(H))D- Diameter at breast height (1.3 m), cm
H- Total tree height, m
ln(B) = a + bln(DBH²) + cln(H). Fitted in R (nlme) on ln-transformed biomass; the paper states no back-transform correction factor and none is applied. Aboveground biomass is above a 10 cm stump (stem, branches, leaves); belowground is the root system plus stump. The paper lists five models (1)-(5); model (2) (ln DBH²H) and (4) (ln DBH²WD) are not added here.
Source
doi:10.3390/f10100862 · Open access · copy we read
(3) −2.275 ± 0.148 1.161 ± 0.026 0.152 ± 0.095 3.114 0.196 0.952 78.7 30.58 −1.91
(3) −2.275 ± 0.148 1.161 ± 0.026 0.152 ± 0.095 3.114 0.196 0.952 78.7 30.58 −1.91
a total of 144 sampled trees
Total 4.2 61.2
- Trees measured
- 144
- DBH range
- 4.2–61.2 cm
- R²
- 0.952
- Method
- ln-ln regression (R, nlme)
- Where
- Fushan, about 26 km northeast of Guangzhou, Guangdong
- Last checked
- 2026-11-02
Calculate
Height from
80.7
Aboveground biomass (kg)
37.93
Carbon (kg), ×0.47
139.1
CO₂e (kg), ×44/12
Shaded: the DBH range the model was fitted on. Other inputs held at the values above.
Checks this equation passes
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 = 15, H = 12 | 80.7 | 80.7 | Computed from the printed form hand-computed from the published form |
| D = 40, H = 22 | 863 | 863 | Computed from the printed form hand-computed from the published form |
Related
- Guangzhou subtropical forest aboveground biomass, Model 1 (DBH only) · Zhao et al. 2019 · DBH
- Guangzhou subtropical forest aboveground biomass, Model 5 (DBH and wood density) · Zhao et al. 2019 · DBH + Wood density
- Guangzhou subtropical forest aboveground biomass, Model 1 (DBH only) · same paper · Aboveground biomass
- Guangzhou subtropical forest aboveground biomass, Model 5 (DBH and wood density) · same paper · Aboveground biomass
- Guangzhou subtropical forest belowground biomass, Model 1 (DBH only) · same paper · Root biomass
- Guangzhou subtropical forest belowground biomass, Model 3 (DBH and height) · same paper · Root biomass
- Guangzhou subtropical forest belowground biomass, Model 5 (DBH and wood density) · same paper · Root biomass
- Guangzhou subtropical forest branch biomass, Model 1 (DBH only) · same paper · Branch biomass
- Guangzhou subtropical forest leaf biomass, Model 1 (DBH only) · same paper · Foliage biomass
- Guangzhou subtropical forest stem biomass, Model 1 (DBH only) · same paper · Stem biomass