# Yonkeu Ntonmen et al. 2022: Complementary allometric model of understory tree biomass in the semi-deciduous rainforest of Cameroon

Yonkeu Ntonmen, A. F., Zapfack, L., Djomo Chimi, C., et al. (2022). Complementary allometric model of understory tree biomass in the semi-deciduous rainforest of Cameroon. Acta Botanica Brasilica, 36, e2020abb0475.

- DOI: https://doi.org/10.1590/0102-33062020abb0475
- Access: open access
- Copy we read: https://www.scielo.br/j/abb/a/ykhPLqBFcf98nZLQ5nZSKZv/?lang=en&format=pdf
- Status: no retraction or correction notice recorded (Crossref is asked weekly); last checked 2026-11-02
- Page: https://treeallometry.org/sources/ntonmen-2022/

## Equations from this source (5)

### Understorey AGB from D30 (1-10 cm stems)

Aboveground biomass for Understorey trees and saplings, 184 species (stems 1–10 cm diameter), Cameroon. Inputs: D30. 1,023 trees.

As printed (Table 2, block "All (1≤ diameter <10 cm)", p. 5):

> lnM= a + b × ln(D) 1023 -2.811*** 2.474*** 0.199 0.475 0.918 1384 0.11 0.11

Page: https://treeallometry.org/equations/ntonmen-2022-agb-d/

### Understorey AGB from D30 and height

Aboveground biomass for Understorey trees and saplings, 184 species (stems 1–10 cm diameter), Cameroon. Inputs: D30 + Height. 1,023 trees.

As printed (Table 2, block "All (1≤ diameter <10 cm)", p. 5):

> lnM= a + b × ln(D) + c × ln(H) 1023 -3.215*** 1.665*** 0.958*** 0.192 0.423 0.935 1149 0.09 2.45

Page: https://treeallometry.org/equations/ntonmen-2022-agb-d-h/

### Understorey AGB from D30 and wood density

Aboveground biomass for Understorey trees and saplings, 184 species (stems 1–10 cm diameter), Cameroon. Inputs: D30 + Wood density. 1,023 trees.

As printed (Table 2, block "All (1≤ diameter <10 cm)", p. 5):

> lnM= a + b × ln(D) + c × ln(ρ) 1023 -2.144*** 2.505*** 1.164*** 0.184 0.419 0.936 1126 0.09 1.16

Page: https://treeallometry.org/equations/ntonmen-2022-agb-d-rho/

### Understorey AGB from D30²·H and wood density

Aboveground biomass for Understorey trees and saplings, 184 species (stems 1–10 cm diameter), Cameroon. Inputs: D30 + Height + Wood density. 1,023 trees.

As printed (Table 2, block "All (1≤ diameter <10 cm)", p. 5):

> lnM= a + b × ln(D2 × H) + c × ln(ρ) 1023 -2.554*** 0.880*** 1.100*** 0.158 0.367 0.951 854 0.07 1.10

Page: https://treeallometry.org/equations/ntonmen-2022-agb-d2h-rho/

### Understorey trunk biomass from D30, height and wood density

Stem biomass for Understorey trees and saplings, 184 species (stems 1–10 cm diameter), Cameroon. Inputs: D30 + Height + Wood density. 1,023 trees.

As printed (Table 3, block "Trunk", p. 6):

> lnM= a + b × ln(D)+c × ln(H) + d × ln (ρ) 1023 -3.480*** 1.731*** 1.096*** 0.897*** 1.318 0.438 0.939 1220 0.10 2.44

Page: https://treeallometry.org/equations/ntonmen-2022-trunk-d-h-rho/