Equations / Aboveground biomass
Poplar aboveground biomass (compatible total-biomass system)
As printed (Table 9, Eq. 32-34)
In this library's units, ready to compute (kg)
Aboveground biomass = 0.046471 * D^2.171796 * H^0.462424D- Diameter at breast height (1.3 m), cm
H- Total tree height, m
Final aboveground model of the compatible system. Compatible total-biomass system (aboveground fitted independently, total and root fitted jointly by simultaneous estimation; weighted nonlinear least squares). Total = aboveground + root. The paper lists the sample as stratified random felled trees across eight diameter classes (4-32 cm) from 2022-2023; the reported minimum and maximum DBH and height are for all sampled trees of the species (Table 1). Root biomass was measured on a subset only (whole-root excavation: root collar, coarse roots, fine roots), so root and total fit ranges are not given beyond the full sample. No back-transform factor (nonlinear fit). The paper also gives aboveground-component (stem, crown, wood, bark, branch, foliage) systems (Tables 17-39), not added here.
doi:10.3390/f17070770 · Open access · copy we read
The sample comprised 154 Chinese fir, 150 poplar, and 157 oak trees.
DBH (cm) 2.2 37.9 17.13 8.95
Tree height (m) 3.7 29.6 16.39 6.81
R2 0.9625 (aboveground model, evaluation table)
- Trees measured
- 150
- DBH range
- 2.2–37.9 cm
- Height range
- 3.7–29.6 m
- R²
- 0.9625
- Method
- weighted nonlinear least squares
- Where
- Hunan Province (14 prefecture-level cities and autonomous prefectures)
- 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 | 19.1 | 19.1 | Computed from the printed form hand-computed from the published form |
| D = 30, H = 20 | 299.8 | 299.8 | Computed from the printed form hand-computed from the published form |
Related
- European general equation, Populus, aboveground, diameter only (Eq. 3) · Forrester et al. 2017 · DBH
- Canadian national equation, trembling aspen, dbh only (sum of wood, bark, branches, foliage; Table 3) · Lambert et al. 2005 · DBH
- Quaking aspen total aboveground biomass from DBH and height (Table 4) · Poudel et al. 2019 · DBH + Height
- Black cottonwood total aboveground biomass from DBH and height (Table 4) · Poudel et al. 2019 · DBH + Height
- Chinese fir aboveground biomass (compatible total-biomass system) · same paper · Aboveground biomass
- Chinese fir root biomass (compatible total-biomass system) · same paper · Root biomass
- Chinese fir total tree biomass (compatible total-biomass system) · same paper · Total biomass
- Oak aboveground biomass (compatible total-biomass system) · same paper · Aboveground biomass
- Oak root biomass (compatible total-biomass system) · same paper · Root biomass
- Oak total tree biomass (compatible total-biomass system) · same paper · Total biomass
- Poplar root biomass (compatible total-biomass system) · same paper · Root biomass
- Poplar total tree biomass (compatible total-biomass system) · same paper · Total biomass