Taxodium distichum / Stem volume
NSVB baldcypress, Subtropical Division (230): total stem wood volume (inside bark), Schumacher-Hall model (Eq. 1)
Stem volumeTaxodium distichum · CupressaceaeUnited StatesRead from the original paper
© Annika Lindqvist · CC BY · iNaturalistEquation
As printed (Table S1a (Table S1a_volib_coefs_spcd.csv, WO-GTR-104-Supp1), columns SPCD,DIVISION,STDORGCD,model,a,a1,b,b1,c,c1)
221,230,,1,0.00122729,,1.863282782,,1.219826036,
In this library's units, ready to compute (m³)
Stem volume = 0.028316846592 * 0.00122729 * (D/2.54)^1.863282782 * (H/0.3048)^1.219826036D- Diameter at breast height (1.3 m), cm
H- Total tree height, m
Output is gross total stem wood volume inside bark, groundline to tip (VtotibGross), before cull or broken-top deductions. DBH is measured at 4.5 ft (1.37 m). Paper units: in, ft, ft3; expression converts D cm→in (/2.54), H m→ft (/0.3048) and ft3→m3 (×0.028316846592). n and the DBH range are from the scorecard for ST_WD_CV_TOT in 230 (table S19).
Source
doi:10.2737/WO-GTR-104 · Open access · copy we read
yi = a × Di^b × Hi^c + 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
221,baldcypress,N,Taxodium,distichum,,,Taxodium distichum
total stem was defined as groundline to tree tip
"Total Stem Wood Volume","ST_WD_CV_TOT","221","230","SUBTROPICAL_DIVISION",191,11.0314136125654,1,24.3
key modeling statistics such as sample sizes (n), tree diameter distributions (minimum, mean, and maximum)
- Trees measured
- 191
- DBH range
- 2.54–61.72 cm
- Method
- NSVB Schumacher-Hall model (Eq. 1), coefficients for SPCD 221 in DIVISION 230 from table S1a; 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
Height from
0.635
Stem volume (m³)
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 = 30.5, H = 21.3 | 0.635 | 0.635 | Computed from the printed form computed from the published form at D = 12 in, H = 70 ft, converted to cm, m and m3 |
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