Equations / Aboveground biomass
Pittosporum eugenoides, NZ, total aboveground biomass from RCD (Table 3)
© Colin Meurk · CC BY-SA · iNaturalistAs printed (Table 3, Total above-ground biomass, Pittosporum eugenoides)
In this library's units, ready to compute (kg)
Aboveground biomass = 0.221 * exp(0.455 * DRC)DRC- Root collar / stem base diameter, cm
Open-spaced juvenile plants (2-year-old containerised plants on-grown for 3 years, sampled up to 5 years). The tables are headed 'at age 5 years' but the appendix figures show points from all harvest years, and the paper gives no n or RCD range for these fits, so none is recorded. x is root collar diameter in mm; biomass in g and height in m (units inferred from Table 2 and Appendix 1 means, which the equations reproduce; the paper does not print units beside the equations). r² for exponential fits is a pseudo r².
doi:10.33494/nzjfs552025x387x · Open access · copy we read
0.897
- R²
- 0.897
- Method
- nonlinear least squares, exponential (y = a e^(bx))
- Where
- Taruheru River terrace, Gisborne, New Zealand
- Last checked
- 2026-11-02
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 |
|---|---|---|---|
| DRC = 2 | 0.549 | 0.549 | Computed from the printed form hand-computed from the published form (RCD in mm, mass in g, converted) |
| DRC = 6 | 3.39 | 3.39 | Computed from the printed form hand-computed from the published form (RCD in mm, mass in g, converted) |
| DRC = 15 | 203.5 | 203.4 | Computed from the printed form hand-computed from the published form (RCD in mm, mass in g, converted) |
Related
- Pittosporum tenuifolium, NZ, total aboveground biomass from RCD (Table 3) · Marden et al. 2025 · Root collar diameter
- Pittosporum crassifolium (Massey University): AGB from D and H (Table 7) · Wangui et al. 2026 · Root collar diameter + Height
- Coprosma robusta, NZ, total aboveground biomass from RCD (Table 3) · same paper · Aboveground biomass
- Coprosma robusta, NZ, belowground biomass from RCD (Table 3) · same paper · Root biomass
- Coprosma robusta, NZ, height from RCD (Table 3) · same paper · Height
- Coprosma robusta, NZ, whole-plant biomass from RCD (Table 6) · same paper · Total biomass
- Cordyline australis, NZ, total aboveground biomass from RCD (Table 3) · same paper · Aboveground biomass
- Cordyline australis, NZ, belowground biomass from RCD (Table 3) · same paper · Root biomass
- Cordyline australis, NZ, height from RCD (Table 3) · same paper · Height
- Cordyline australis, NZ, whole-plant biomass from RCD (Table 6) · same paper · Total biomass