Equations / Aboveground biomass

Nothofagus antarctica aboveground dry weight from DAP (Cuadro 1)

Aboveground biomassNothofagus antarctica · NothofagaceaeArgentinanaturalRead from the original paper

Equation

As printed (Cuadro 1, Nothofagus antarctica column, T row (DAP), p. 98)

T –53,873 + 7,373 * DAP

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

Aboveground biomass = -53.873 + 7.373 * D

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

Total aboveground dry weight (T, kg) is the sum of leaves, thin and thick branches and stem, built branch by branch. Adjusted R² 0,94 is printed as R² aj.; the schema field r2 is left out because the paper gives only the adjusted value. No correction factor applies (linear model). The paper felled 16 ñire trees, but the DAP equation was fitted on n = 10, so the printed felled-tree DAP range (6,8 to 21,1 cm) is not assumed to describe this fit and is left out. The same table gives a basal-diameter (DB, measured at 15 cm above ground) equation, not added because DB at 15 cm is not a canonical variable. Stem dry weight (F) rows are credited to Gyenge et al. (2008) and the DAP volume rows to Reque et al. (2007), so they are not taken from this paper.

Source

Gyenge, J., Fernández, M. E., Sarasola, M., de Urquiza, M., & Schlichter, T. (2009). Ecuaciones para la estimación de biomasa aérea y volumen de fuste de algunas especies leñosas nativas en el valle del río Foyel, NO de la Patagonia argentina. Bosque, 30(2), 95-101.

doi:10.4067/s0717-92002009000200005 · Open access · copy we read

T –53,873 + 7,373 * DAP 0,94 10

Trees measured · Cuadro 1, R² aj. and n columns, p. 98

Trees measured: 10
Method: stepwise linear regression of tree dry weight on DAP (adjusted R² 0,94)
Where: Foyel river valley, Río Negro, NW Patagonia, Argentina
Last checked: 2026-11-02

Calculate

DBH (cm)

19.86

Aboveground biomass (kg)

9.333

Carbon (kg), ×0.47

34.22

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 = 10	19.9	19.9	Computed from the printed form hand-computed from the Cuadro form
D = 20	93.6	93.6	Computed from the printed form hand-computed from the Cuadro form

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Nothofagus antarctica aboveground dry weight from DAP (Cuadro 1)

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