Tree Allometrics

Pinus tabuliformis / Total biomass

Chinese pine total tree biomass from DBH (age-sequence plantations)

Total biomassPinus tabuliformis · PinaceaeChinaplantationRead from the original paper
Photo of Pinus tabuliformis
© Ianz on Flickr · CC BY-SA · iNaturalist
Equation

As printed (Section 2.3, Eq. 1)

M = aD^b

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

Total biomass = 0.8996 * D^1.5732
D
Diameter at breast height (1.3 m), cm

M = aD^b. Power model M = aD^b (or a(D²H)^b) fitted by non-linear least squares (no log back-transform). Sample trees were 60 destructively harvested trees from stands aged 8, 18, 32 and 46 years; the paper does not give the DBH or height range of the sample trees (Table 1 gives stand means only), so none is given. Roots are coarse roots (>5 mm), so the root and total-tree equations leave out fine roots. The third form in Table 3, M = aD^b A^c, needs stand age (not a canonical variable) and is not added. Total tree = aboveground + root.

Source
Total tree (1) 0.8996 1.5732 0.985 409 <0.001
Equation · Table 3
Total tree (1) 0.8996 1.5732 0.985 409 <0.001
R² · Table 3
In total, 60 sample trees were selected for the destructive measurement.
Trees measured · Section 2.2
Trees measured
60
R²
0.985
Method
non-linear least squares
Where
Lahailing forestry station, Chengde, northern Hebei Province
Last checked
2026-11-02
Calculate
33.7
Total biomass (kg)
15.8
Carbon (kg), ×0.47
58
CO₂e (kg), ×44/12
050100150200250300510152025303540DBH (cm)Total biomass (kg)Total 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 = 1033.733.7Computed from the printed form
hand-computed from the published form
D = 25142142Computed from the printed form
hand-computed from the published form

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