Equations / Foliage biomass
Grey alder foliage dry mass from DBH (general equation)
© Hladac · CC BY-SA · iNaturalistAs printed (Eq. 21, p. 73)
In this library's units, ready to compute (kg)
Foliage biomass = 0.0041 * D^2.0522D- Diameter at breast height (1.3 m), cm
General equation fitted on all 21 model trees from four grey alder stands. D is trunk diameter at 1.3 m (cm); output is absolutely dry mass in kg. The last digit of the exponent is clipped in the printed Eq. 20 and 21 (2.3413 and 2.0522 read from the PDF); Table 5 values reproduce within 1% across D = 4 to 16 cm. Per-stand equations in Table 1 are not included. Trunk bark (Eq. 19: 0.0144*D^2.1832, R2 0.7892) has no separate output quantity and is not included.
doi:10.34220/issn.2222-7962/2022.3/6 · Open access · copy we read
A total of 21 model trees were studied
которые работают при таксационных диаметрах от 4 до 17 см
- Trees measured
- 21
- DBH range
- 4–17 cm
- R²
- 0.8214
- Method
- power regression on 21 model trees pooled over 4 stands
- Where
- Arkhangelsk forestry, North-taiga region, Arkhangelsk oblast
- 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 = 4 | 0.0710 | 0.0705 | Value printed in the paper Table 5, p. 73 |
| D = 10 | 0.462 | 0.462 | Value printed in the paper Table 5, p. 73 |
| D = 16 | 1.21 | 1.21 | Value printed in the paper Table 5, p. 73 |
Related
- Gray alder, Arkhangelsk: foliage biomass from D (Table 2) · Karaban et al. 2023 · DBH
- Grey alder branches dry mass from DBH (general equation) · same paper · Branch biomass
- Grey alder trunk wood (bark excluded) dry mass from DBH (general equation) · same paper · Stem biomass