Acer rubrum / Aboveground biomass, without leaves
NSVB red maple, species-level: total aboveground biomass, modified Wiley model (Eq. 4)
mefisher · CC0 · iNaturalistAs printed (Example 2, p. 15)
In this library's units, ready to compute (kg)
Aboveground biomass, without leaves = 0.45359237 * 0.31573027567 * (D/2.54)^1.853839844372 * (H/0.3048)^0.740557378679 * exp(-(-0.024745684975 * (D/2.54)))D- Diameter at breast height (1.3 m), cm
H- Total tree height, m
Output is gross AGB without foliage (AGBPredicted), before NSVB's cull and broken-top reductions. Species-level coefficients (no ecodivision): table S8a in the supplement has no red maple row for M210, the division of the tree in Example 2, so the example uses the species-level row; NSVB uses division-specific coefficients where table S8a has a row for the tree's division. These are the coefficients NSVB applies to red maple in the Warm Continental Mountains (M210). Paper units: in, ft, lb; expression converts D cm→in (/2.54), H m→ft (/0.3048) and lb→kg (×0.45359237). n and the DBH range are from the scorecard for TT_WDBK_DW_ADJ across ecodivisions (table S13). For AGB the scorecard rates NSVB's harmonized total (TT_WDBK_DW_ADJ), not this model alone; only its n and DBH range are used. DBH is measured at 4.5 ft (1.37 m).
doi:10.2737/WO-GTR-104 · Open access · copy we read
Assume a red maple (Acer rubrum; SPCD = 316)
growing in the Warm Continental Mountains (DIVISION = M210)
yi = a × Di^b × Hi^c × exp(−(b1 × Di)) + εi
Di is diameter (inches) at breast height (4.5 feet), Hi is total tree height (feet)
units for volume and biomass predictions are cubic feet and pounds, respectively
total aboveground biomass (without foliage)
"Total Tree Wood+Bark","TT_WDBK_DW_ADJ","316",468,6.57200854700855,1,33.7
key modeling statistics such as sample sizes (n), tree diameter distributions (minimum, mean, and maximum)
If a species occurs in an ecodivision not explicitly listed, the entry having no ecodivision noted is used.
- Trees measured
- 468
- DBH range
- 2.54–85.6 cm
- Method
- NSVB modified Wiley model (Eq. 4), coefficients for SPCD 316 species-level row (no DIVISION) from table S8a (the total aboveground biomass table used in Example 2); fitted with weighted regression to destructively sampled trees
- Where
- United States, species-level fit (NSVB uses it wherever table S8a has no row for the tree's ecodivision)
- Last checked
- 2026-11-03
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 = 28.2, H = 11.6 | 242 | 242 | Value printed in the paper Example 2 (p. 15) prints 532.584798820042 lb for D = 11.1 in, H = 38 ft; inputs and expected converted to cm, m, kg |
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