Equations / Aboveground biomass

Tropical pines AGB from DBH (Eq. 3.1.8 / 3.2.8)

Aboveground biomassPinus · PinaceaeGlobalmixedRead from the original paper

Covers the whole genus

Equation

As printed (Eq. 3.1.8, Section 3.2.1 table)

Y(kg) = exp{-1.170+2.119*ln(D)}

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

Aboveground biomass = exp(-1.170 + 2.119 * ln(D))

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

Preliminary equation from harvested pines in eight literature sources (southeastern USA, India, Puerto Rico), several Pinus species pooled. The HTML labels it Eq. 3.1.8 while the text calls it Eq. 3.2.8. r2 is adjusted r². The primer does not say whether a log back-transform correction is included; none applied. Stand origin (plantation vs natural) not stated.

Source

Brown, S. (1997). Estimating Biomass and Biomass Change of Tropical Forests: a Primer. FAO Forestry Paper 134. Rome: Food and Agriculture Organization of the United Nations. ISBN 92-5-103955-0.

https://www.fao.org/4/w4095e/w4095e00.htm · Open access · copy we read

Y= biomass per tree in kg, D = dbh in cm, and BA = basal area in cm2

Units · Section 3.2.1, biomass regression equations table header

D = dbh, cm; range in dbh = 2-52 cm; number of trees =63; adjusted r 2 =0.98

Trees measured · Section 3.2.1, conifer forests

Trees measured: 63
DBH range: 2–52 cm
R²: 0.98
Where: Pine stands in the southeastern USA, India and Puerto Rico; offered for tropical pine forests
Last checked: 2026-11-01

Calculate

DBH (cm)

177.3

Aboveground biomass (kg)

83.34

Carbon (kg), ×0.47

305.6

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 = 20	177.3	177.3	Computed from the printed form computed with python3 from the published form

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Dry tropical zone AGB from DBH (Eq. 3.2.1) · same paper · Aboveground biomass
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Compare these curves

Tropical pines AGB from DBH (Eq. 3.1.8 / 3.2.8)

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