Tree Allometrics

Equations / Root:shoot ratio

Root-to-shoot ratio, Tropical moist forest, North and South America (natural, AGB ≤ 125 t/ha)

Root:shoot ratioTropical moist forest treesNorth and South America; Tropical moist ecological zone (FAO 2015 Global Ecological Zones)naturalRead from the original paper
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Equation

As printed (Table 4.4 (Updated), p. 4.18)

Tropical moist | North and South America | Natural ≤ 125 0.2845 0.061 SD 12

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

Root:shoot ratio = 0.2845

IPCC Tier 1 default R (root d.m. / shoot d.m.). Applies to stands with above-ground biomass ≤ 125 tonnes/ha: the threshold is stand-level (t/ha), not tree AGB, so it cannot be expressed in the tree-level expression. Uncertainty SD 0.061. Table references: 12 (12 = Mokany et al. 2006). Multiply tree AGB by R to estimate BGB.

Source
RATIO OF BELOW-GROUND BIOMASS TO ABOVE-GROUND BIOMASS (R) [TONNE ROOT D.M. (TONNE SHOOT D.M.)-1]
Output · Table 4.4 (Updated) title, p. 4.18
Where
North and South America; Tropical moist ecological zone (FAO 2015 Global Ecological Zones)
Last checked
2026-11-01
Calculate
0.285
Root:shoot ratio
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
AGB = 5000.2840.284Value printed in the paper
constant ratio printed in Table 4.4 (Updated), p. 4.18; independent of tree AGB

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