Equations / Root:shoot ratio
Root-to-shoot ratio, Tropical rainforest forest, North and South America (natural, AGB ≤ 125 and > 125 (same value) t/ha)
Root:shoot ratioTropical rainforest forest treesNorth and South America; Tropical rainforest 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 rainforest | North and South America | Natural ≤ 125 0.221 0.036 SD 4
In this library's units, ready to compute (unitless)
Root:shoot ratio = 0.221IPCC Tier 1 default R (root d.m. / shoot d.m.). Applies to stands with above-ground biomass ≤ 125 and > 125 (same value) tonnes/ha: the threshold is stand-level (t/ha), not tree AGB, so it cannot be expressed in the tree-level expression. Uncertainty SD 0.036. Table references: 4 (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]
- Where
- North and South America; Tropical rainforest ecological zone (FAO 2015 Global Ecological Zones)
- Last checked
- 2026-11-01
Calculate
0.221
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%.
| Inputs | Expected | We get | From |
|---|---|---|---|
| AGB = 500 | 0.221 | 0.221 | Value printed in the paper constant ratio printed in Table 4.4 (Updated), p. 4.18; independent of tree AGB |
Related
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