Equations / Aboveground biomass

Alnus acuminata (aliso) AGB, sum of SUR component models (DBH, height)

Aboveground biomassAlnus acuminata · BetulaceaeEcuadoragroforestryRead from the original paper

Equation

As printed (Tabla 4, Aliso, Fuste)

W f = 0,1483*DBH2+0,003688*DBH2*Ht

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

Aboveground biomass = 0.347148 * D^2 + 0.003688 * D^2 * H - 1.267285 * H

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

Total aboveground dry biomass (kg) is the sum of the four additive SUR component equations in Tabla 4 (stem with bark, coarse branches 2–7 cm, thin branches <2 cm, leaves); the paper prints no single total equation. r2 is the adjusted R² of total biomass. Linear models, no log correction. The negative height terms make predictions unreliable for short, thick trees outside the fitted range. A journal version is Riofrío et al. (2015) Biomass and Bioenergy 80:252-259 (not read).

Source

Riofrío, J., Herrero de Aza, C., Grijalva, J., & Bravo, F. (2013). Modelos para estimar la biomasa de especies forestales en sistemas agroforestales de la ecorregión andina del Ecuador. 6º Congreso Forestal Español, Vitoria-Gasteiz, Spain. Paper 6CFE01-023.

https://www.congresoforestal.es/actas/doc/6CFE/6CFE01-023.pdf · Open access

W rg = 0,080183*DBH2 - 0,569041*Ht

Equation · Tabla 4, Aliso, Ramas gruesas

W rd = 0,085229DBH2 - 0,483528*Ht

Equation · Tabla 4, Aliso, Ramillas delgadas

W h = 0,033436*DBH2 - 0,214716*Ht

Equation · Tabla 4, Aliso, Hojas

Biomasa total 9,72 0,938

R² · Tabla 4, Aliso (RMSE kg, R2 ajustado)

Aliso 30 14,5 3,2 9,3 20,3 10,7 1,4 6,8 12,8

Smallest DBH · Tabla 1 (n, DBH mean SD min max, Ht mean SD min max)

Trees measured: 30
DBH range: 9.3–20.3 cm
Height range: 6.8–12.8 m
R²: 0.938
Method: Component models (stem, coarse branches, thin branches, leaves) fitted simultaneously by seemingly unrelated regression (SUR); total = sum of components
Where: Two INIAP agroforestry systems, inter-Andean western cordillera of northern/central Ecuador, above 3000 m (Bosque Siempreverde Montano Alto)
Last checked: 2026-11-01

Calculate

DBH (cm)Height (m)

Height from

67.72

Aboveground biomass (kg)

31.83

Carbon (kg), ×0.47

116.7

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 = 14.5, H = 10.7	67.7	67.7	Computed from the printed form computed from the sum of published components at the sample means (observed mean Wt 71,1 kg, Tabla 1)
D = 20, H = 12	141.4	141.4	Computed from the printed form computed from the sum of published components

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Gray alder, European Russia pooled: aboveground biomass from D (Eq. 5) · Karaban et al. 2023 · DBH
Gray alder, Arkhangelsk: aboveground biomass from D (Table 2) · Karaban et al. 2023 · DBH
Red alder total aboveground biomass from DBH and height (Table 4) · Poudel et al. 2019 · DBH + Height
Acacia melanoxylon AGB in Andean agroforestry, sum of SUR component models (DBH, height) · same paper · Aboveground biomass
Buddleja coriacea (colle) AGB per stem from diameter at 30 cm and height (sum of SUR components) · same paper · Aboveground biomass

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Alnus acuminata (aliso) AGB, sum of SUR component models (DBH, height)

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