Tree Allometrics

Cunninghamia lanceolata / Aboveground biomass

Chinese fir aboveground biomass (compatible total-biomass system)

Aboveground biomassCunninghamia lanceolata · CupressaceaeChinamixedRead from the original paper
Photo of Cunninghamia lanceolata
© harum.koh · CC BY-SA · iNaturalist
Equation

As printed (Table 8, Eq. 29-31)

Baboveground = 0.065662D 1.750420 H 0.780381 (30)

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

Aboveground biomass = 0.065662 * D^1.750420 * H^0.780381
D
Diameter at breast height (1.3 m), cm
H
Total tree height, m

Final aboveground model of the compatible system. Compatible total-biomass system (aboveground fitted independently, total and root fitted jointly by simultaneous estimation; weighted nonlinear least squares). Total = aboveground + root. The paper lists the sample as stratified random felled trees across eight diameter classes (4-32 cm) from 2022-2023; the reported minimum and maximum DBH and height are for all sampled trees of the species (Table 1). Root biomass was measured on a subset only (whole-root excavation: root collar, coarse roots, fine roots), so root and total fit ranges are not given beyond the full sample. No back-transform factor (nonlinear fit). The paper also gives aboveground-component (stem, crown, wood, bark, branch, foliage) systems (Tables 17-39), not added here.

Source
The sample comprised 154 Chinese fir, 150 poplar, and 157 oak trees.
Trees measured · Section 2.2
DBH (cm) 2.2 35.3 19.88 7.77
Smallest DBH · Table 1, Chinese fir
Tree height (m) 2.5 25.6 14.25 5.38
h min m · Table 1, Chinese fir
R2 0.9242 (aboveground model, evaluation table)
R² · Table 11
Trees measured
154
DBH range
2.2–35.3 cm
Height range
2.5–25.6 m
R²
0.9242
Method
weighted nonlinear least squares
Where
Hunan Province (14 prefecture-level cities and autonomous prefectures)
Last checked
2026-11-02
Calculate
Height from
20.5
Aboveground biomass (kg)
9.65
Carbon (kg), ×0.47
35.4
CO₂e (kg), ×44/12
Fitted DBH range050100150200250510152025303540DBH (cm)Aboveground biomass (kg)Aboveground 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 = 10, H = 920.520.5Computed from the printed form
hand-computed from the published form
D = 30, H = 20262262Computed from the printed form
hand-computed from the published form

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