Mezilaurus itauba / Stem volume

Commercial stem volume from DBH, Mezilaurus itauba (species-specific, Table 2)

Stem volumeMezilaurus itauba · LauraceaeBrazilnaturalRead from the original paper

Equation

As printed (Table 2, SSEs rows)

M. itauba vc = exp(-7.25817 + 2.05543ln(DBH)) 0.68 1.712 26.2

In this library's units, ready to compute (m³)

Stem volume = exp(-7.25817 + 2.05543 * ln(D))

D: Diameter at breast height (1.3 m), cm

Species-specific equation (M. itauba, Itaúba). vc is the commercial volume of the stem (sum of Smalian log volumes, hollows discounted), not total tree volume. No back-transformation correction factor is stated, so none is applied. n_trees is the adjustment (fitting) set; DBH range is that of the whole dataset (all species), not stated per species. Ten percent of trees were held out for validation. 8 of the 36+1 species equations in Table 2 were added (the ten most important commercial species by harvested volume plus H. petraeum); the generic FMA equation was rejected by the authors' own paired t-test.

Source

Santos, M.F. dos, Figueiredo Filho, A., Gama, J.R.V., Retslaff, F.A. de S., Costa, D.L. da (2020). Species-specific equations: greater precision in commercial volume estimation in managed forests in the Amazon. CERNE, 26(3), 315-330.

doi:10.1590/01047760202026032741 · Open access · copy we read

Mezilaurus itauba (Meisn.) Taub. ex Mez. Itaúba 593 65

Trees measured · Table 1 (columns: adjustment, validation)

29,119 trees (50.0 cm ≤ DBH ≤ 175.0 cm) of 43 commercial species

Smallest DBH · Material and Methods, Data collection

composed the commercial volume (vc) of the stem

Output · Material and Methods, Data collection

Trees measured: 593
DBH range: from 50 cm
R²: 0.68
Method: Model 2 (Husch) fitted by least squares on ln(vc); r2 is the adjusted R² recalculated in arithmetic units; Syx = 1.712 m3 (26.2%)
Where: Tapajós National Forest, Pará (community forest management concession), eastern Brazilian Amazon
Last checked: 2026-11-02

Calculate

DBH (cm)

3.18

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 = 60	3.18	3.18	Computed from the printed form hand-computed from the Table 2 coefficients
D = 90	7.32	7.32	Computed from the printed form hand-computed from the Table 2 coefficients
D = 130	15.6	15.6	Computed from the printed form hand-computed from the Table 2 coefficients

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