Magnolia champaca / Stem volume
M. champaca stem volume from DBH and height, 10–30 cm (Table 3)
© Ong Jyh Seng · CC BY-SA · iNaturalistAs printed (Table 3, Diameter class 10–30 cm)
In this library's units, ready to compute (m³)
Stem volume = 0.372 * (D/100)^2 * HD- Diameter at breast height (1.3 m), cm
H- Total tree height, m
Class-specific model: use only for trees in the stated DBH class. Non-destructive: volumes of standing trees were summed from laser-rangefinder frustum measurements (stem volume), not felled. The paper states d and h in metres, so published units use m; canonical form divides D (cm) by 100. Adj. R² and SE are printed per class but not stored (adj. R² is not R²). The class bounds are the sampling classes; the paper gives no measured DBH range. The paper also gives biomass = stem volume x wood specific gravity (not a fitted model, not added).
doi:10.18520/cs/v116/i1/75-81 · Open access
all the parameters were converted into metres, and volume was calculated in cubic metres
n = 75, 25 trees for each diameter class
All the trees were divided into three diameter classes according to their DBH, viz. 10–30, 31–50 and >50 cm
- Trees measured
- 25
- DBH range
- 10–30 cm
- Method
- Linear regression through the origin (SPSS), non-destructive frustum volumes (Newton's formula)
- Where
- Meghalaya, NE India (Garo, Khasi, Jaintia Hills and Ri-Bhoi districts)
- 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 = 20, H = 18 | 0.268 | 0.268 | Computed from the printed form computed from the Table 3 coefficient |
Related
- M. champaca stem volume from DBH, 10–30 cm (Table 7) · Giri et al. 2019 · DBH
- M. champaca stem volume from DBH, 31–50 cm (Table 7) · Giri et al. 2019 · DBH
- M. champaca stem volume from DBH and height, 31–50 cm (Table 3) · Giri et al. 2019 · DBH + Height
- M. champaca stem volume from DBH, >50 cm (Table 7) · Giri et al. 2019 · DBH
- M. champaca stem volume from DBH and height, >50 cm (Table 3) · Giri et al. 2019 · DBH + Height
- B. alnoides stem volume from DBH, 10–30 cm (Table 5) · same paper · Stem volume
- B. alnoides stem volume from DBH and height, 10–30 cm (Table 1) · same paper · Stem volume
- B. alnoides stem volume from DBH, 31–50 cm (Table 5) · same paper · Stem volume
- B. alnoides stem volume from DBH and height, 31–50 cm (Table 1) · same paper · Stem volume
- B. alnoides stem volume from DBH, >50 cm (Table 5) · same paper · Stem volume
- B. alnoides stem volume from DBH and height, >50 cm (Table 1) · same paper · Stem volume
- D. grandiflora stem volume from DBH, 10–30 cm (Table 6) · same paper · Stem volume
- D. grandiflora stem volume from DBH and height, 10–30 cm (Table 2) · same paper · Stem volume