Equations / Root biomass
Oak root biomass (compatible total-biomass system)
As printed (Table 10, Eq. 35-37)
In this library's units, ready to compute (kg)
Root biomass = 0.018969 * (D^2 * H)^0.89162D- Diameter at breast height (1.3 m), cm
H- Total tree height, m
Final root model of the compatible system, fitted on trees with root samples (n from Table 1). 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. Eq. 37 and Table 10 print the same parameters. R² is the evaluation row marked * (the 50 trees with measured roots, matching n_trees; the paper's Discussion cites these starred values as the root-model R²); the unstarred row (0.8592) is evaluated over all sampled trees, most of which have no measured roots.
doi:10.3390/f17070770 · Open access · copy we read
Oak 157 (50) (Total Samples (Root Samples))
(28) * 0.7778 23.78 −0.80 14.34 47.64 85.29
- Trees measured
- 50
- R²
- 0.7778
- 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 | 8.17 | 8.17 | Computed from the printed form hand-computed from the published form |
| D = 30, H = 20 | 118 | 118 | Computed from the printed form hand-computed from the published form |
Related
- Oak root biomass from D (Table 3) · Meng et al. 2021 · DBH
- Quercus robur and Q. petraea, Germany, belowground biomass from DBH (Eq. 4, Tab. 1) · Röhling et al. 2019 · DBH
- Quercus canariensis root biomass (Table 2) · Ruiz-Peinado et al. 2012 · DBH
- Quercus faginea root biomass (Table 2) · Ruiz-Peinado et al. 2012 · DBH
- Quercus ilex root biomass (Table 2) · Ruiz-Peinado et al. 2012 · DBH
- Quercus pyrenaica root biomass (Table 2) · Ruiz-Peinado et al. 2012 · DBH
- Quercus suber root biomass (Table 2) · Ruiz-Peinado et al. 2012 · DBH
- 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 total tree biomass (compatible total-biomass system) · same paper · Total biomass
- Poplar aboveground biomass (compatible total-biomass system) · same paper · Aboveground biomass
- Poplar root biomass (compatible total-biomass system) · same paper · Root biomass
- Poplar total tree biomass (compatible total-biomass system) · same paper · Total biomass