Equations / Foliage biomass
Populus balsamifera leaf biomass, cross-sectional area at 0.3 m (NLS)
As printed (Table 3, Eqs. 2-5)
In this library's units, ready to compute (kg)
Foliage biomass = 8.31954 * (0.785398163397448 * D30^2)^1.1007 / 1000D30- Stem diameter at 30 cm, cm
Paper's predictor is cross-sectional area (cm2) of the stem(s) at 0.3 m; converted here to D30 as pi/4 * D30^2 (pi written as 0.785398163397448 * ...), so for multi-stemmed trees D30 is the equivalent diameter of the summed cross-sectional area. Paper output is in g dry mass; canonical form divides by 1000. Fit range of the predictor is not stated, so none is given. Table 3 labels this row "ILS"; it sits in the NLS position (β, SE(β), α, SE(α) columns, no CF) and the paper defines only NLS and LLRC, so it is read as a misprint of NLS.
doi:10.3390/f12020234 · Open access · copy we read
Populus balsamifera 31
- Trees measured
- 31
- R²
- 0.834
- Method
- iterative nonlinear least squares power function, y = β x^α (unweighted), x = cross-sectional area
- Where
- Sporadic to discontinuous permafrost zone, Taiga Plains and Taiga Shield ecozones, northwestern Canada
- 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 |
|---|---|---|---|
| D30 = 2 | 0.0293 | 0.0293 | Computed from the printed form computed from the published form (coefficients as printed) |
| D30 = 5 | 0.221 | 0.220 | Computed from the printed form computed from the published form (coefficients as printed) |
| D30 = 8 | 0.620 | 0.620 | Computed from the printed form computed from the published form (coefficients as printed) |
Related
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