Pinus taeda / Aboveground biomass, without leaves

NSVB loblolly pine (natural stands), Subtropical Division (230): total aboveground biomass (without foliage), segmented model (Eq. 2), D ≥ 9 in (22.86 cm)

Aboveground biomass, without leavesPinus taeda · PinaceaeUnited StatesnaturalRead from the original paper

Equation

As printed (Table S8a (Table S8a_total_biomass_coefs_spcd.csv, WO-GTR-104-Supp1), columns SPCD,DIVISION,STDORGCD,model,a,a1,b,b1,c,c1)

131,230,0,2,0.045928912,,1.956540143,1.955393942,1.154203033,

In this library's units, ready to compute (kg)

Aboveground biomass, without leaves = 0.45359237 * 0.045928912 * 9^(1.956540143 - 1.955393942) * (D/2.54)^1.955393942 * (H/0.3048)^1.154203033

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 and harmonization with components. DBH is measured at 4.5 ft (1.37 m). Paper units: in, ft, lb; expression converts D cm→in (/2.54), H m→ft (/0.3048) and lb→kg (×0.45359237). The scorecards don't split loblolly and slash pine by stand origin, so n and DBH range are left out. The DBH lower limit is the segmentation point k, not a data range. Upper branch of the segmented model; pair with westfall-2024-pinus-taeda-230-natural-agb-small.

Source

Westfall, J.A., Coulston, J.W., Gray, A.N., Shaw, J.D., Radtke, P.J., Walker, D.M., Weiskittel, A.R., et al. (2024). A national-scale tree volume, biomass, and carbon modeling system for the United States. Gen. Tech. Rep. WO-104. Washington, DC: USDA Forest Service. 37 p.

doi:10.2737/WO-GTR-104 · Open access · copy we read

yi = a × Di^b × Hi^c + εi; Di < k / yi = a × k^(b−b1) × Di^b1 × Hi^c + εi; Di ≥ k

Equation · Eq. 2, p. 2

Di is diameter (inches) at breast height (4.5 feet), Hi is total tree height (feet)

Units · Methods, Model development, p. 2

units for volume and biomass predictions are cubic feet and pounds, respectively

published.output unit · Examples of tree-level calculations, p. 8

131,loblolly pine,N,Pinus,taeda,,,Pinus taeda

Taxon · FIADB REF_SPECIES.csv (FIA DataMart), columns SPCD,COMMON_NAME,SHARED_COMMON_NAME_IND,GENUS,SPECIES,VARIETY,SUBSPECIES,SCIENTIFIC_NAME: the species codes the NSVB tables use

total aboveground biomass (without foliage)

output.excludes · Methods, Model development, p. 4

k is a set segmentation point that is 9.0 inches for softwoods (SPCD<300) and 11.0 inches for hardwoods (SPCD≥300)

Equation · Methods, Model development, p. 2

stand origins for planted (stand origin code (STDORGCD) = 1) and natural (STDORGCD = 0) stands may be fitted separately

stand · Methods, Model development, p. 3

DBH range: from 22.86 cm
Method: NSVB segmented model (Eq. 2), coefficients for SPCD 131 in DIVISION 230, STDORGCD 0 from table S8a; fitted with weighted regression to destructively sampled trees
Where: FIA ecodivision Subtropical Division (230), mapped in GTR fig. 1
Last checked: 2026-11-03

Calculate

DBH (cm)Height (m)

Height from

702

Aboveground biomass, without leaves (kg)

330

Carbon (kg), ×0.47

1,210

CO₂e (kg), ×44/12

Shaded: the DBH range the model was fitted on. Other inputs held at the values above.

Checks this equation passes

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 = 38.1, H = 25.9	702	702	Computed from the printed form computed from the published form at D = 15 in, H = 85 ft, converted to cm, m and kg

Report a problem with this equation · JSON

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Compare these curves

NSVB loblolly pine (natural stands), Subtropical Division (230): total aboveground biomass (without foliage), segmented model (Eq. 2), D ≥ 9 in (22.86 cm)

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