Tree Allometrics

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Fraxinus angustifolia root biomass (Table 2)

Root biomassFraxinus angustifolia · OleaceaeSpainmixedRead from the original paper
Photo of Fraxinus angustifolia
© Nico Hernandez · CC BY · iNaturalist
Equation

As printed (Table 2, Fraxinus angustifolia, Roots row)

Wr = 0.359 · d²

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

Root biomass = 0.359 * D^2
D
Diameter at breast height (1.3 m), cm

Belowground biomass; fewer trees than aboveground (one tree per diameter class). Table 1 diameter range covers all sample trees, not only the root subset, so no DBH range is set. Stand type is not stated per species in the paper. Branch equations for this species are not added.

Source
Fraxinus angustifolia ... 8
Trees measured · Table 1, Fraxinus angustifolia row, root biomass n column
Trees measured
8
Method
regression fitted independently of the aboveground system
Where
Spain (sample zones per species, Figure 1)
Last checked
2026-11-02
Calculate
80.77
Root biomass (kg)
37.96
Carbon (kg), ×0.47
139.2
CO₂e (kg), ×44/12
0100200300400500600510152025303540DBH (cm)Root biomass (kg)Root biomass

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%.

InputsExpectedWe getFrom
D = 1580.880.8Computed from the printed form
computed from the Table 2 coefficients
D = 35439.8439.8Computed from the printed form
computed from the Table 2 coefficients

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