Quercus alba / Aboveground biomass, without leaves
NSVB white oak, Hot Continental Mountains (M220), segmented model, D ≥ 11 in (27.94 cm)
© Douglas Goldman · CC BY-SA · iNaturalistAs printed (Example 4, p. 24)
In this library's units, ready to compute (kg)
Aboveground biomass, without leaves = 0.45359237 * 0.024470323124 * 11^(1.93799905037 - 1.886819489967) * (D/2.54)^1.886819489967 * (H/0.3048)^1.403264431619D- Diameter at breast height (1.3 m), cm
H- Total tree height, m
Upper branch of the segmented model (valid for D ≥ 11 in = 27.94 cm); pair with westfall-2024-quercus-alba-m220-small below that. dbh_min_cm is the segmentation point, not a data range. Output is gross AGB excluding foliage, before NSVB's cull/broken-top reductions and harmonization with stem/bark/branch components. Coefficients are those printed in the GTR's worked example; other ecodivisions use different coefficients (table S8a). Paper units: in, ft, lb; expression converts D cm→in (/2.54), H m→ft (/0.3048) and lb→kg (×0.45359237).
doi:10.2737/WO-GTR-104 · Open access · copy we read
a live white oak (Quercus alba; SPCD = 802) tree having D = 18.1 inches, H = 65 feet
growing in the Hot Continental Mountains (DIVISION = M220)
k is a set segmentation point that is 9.0 inches for softwoods (SPCD<300) and 11.0 inches for hardwoods (SPCD≥300)
Di is diameter (inches) at breast height (4.5 feet), Hi is total tree height (feet)
yi = a × k^(b−b1) × Di^b1 × Hi^c + εi; Di ≥ k
- DBH range
- from 27.94 cm
- Method
- NSVB segmented model (Eq. 2), coefficients for SPCD 802 in DIVISION M220 from table S8a, as printed in Example 4; nonlinear fit to destructively sampled legacy and new tree data
- Where
- FIA ecodivision M220, Hot Continental Mountains (Appalachian/Ozark highlands)
- Last checked
- 2026-11-01
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 = 46, H = 19.8 | 1,037 | 1,037 | Value printed in the paper Example 4 (p. 24) prints AGBPredicted = 2285.319903933610 lb for D = 18.1 in, H = 65 ft; inputs and expected converted to cm, m, kg |
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- NSVB white oak, Hot Continental Mountains (M220), segmented model, D < 11 in (27.94 cm) · same paper · Aboveground biomass, without leaves