# Wirabuana et al. 2025: Diameter-Height relationship model for Shorea assamica in secondary tropical rainforest, South Borneo

Wirabuana, P., Nugroho, Y., & Mulyana, B. (2025). Diameter-Height relationship model for Shorea assamica in secondary tropical rainforest, South Borneo. Journal of Sylva Indonesiana, 8(2), 82-91.

- DOI: https://doi.org/10.32734/jsi.v8i2.18749
- Access: open access
- Copy we read: https://talenta.usu.ac.id/Jsi/article/download/18749/9304
- Status: no retraction or correction notice recorded (Crossref is asked weekly); last checked 2026-11-02
- Page: https://treeallometry.org/sources/wirabuana-2025/

## Equations from this source (3)

### Shorea assamica height from D, Linear model (Table 4)

Height for Shorea assamica, Indonesia. Inputs: DBH. DBH 20–67 cm. 1,009 trees.

As printed (Table 1 and Table 4, Linear row):

> Linear H = a + b.DBH; a = 6.97, b = 0.23

Page: https://treeallometry.org/equations/wirabuana-2025-h-linear/

### Shorea assamica height from D, Power model (best fit, Table 4)

Height for Shorea assamica, Indonesia. Inputs: DBH. DBH 20–67 cm. 1,009 trees.

As printed (Table 1 and Table 4, Power row):

> Power H = a.DBH^b; a = 2.11, b = 0.55

Page: https://treeallometry.org/equations/wirabuana-2025-h-power/

### Shorea assamica height from D, Sigmoid model (Table 4)

Height for Shorea assamica, Indonesia. Inputs: DBH. DBH 20–67 cm. 1,009 trees.

As printed (Table 1 and Table 4, Sigmoid row):

> Sigmoid H = e^(a + b/DBH); a = 3.28, b = -18.89

Page: https://treeallometry.org/equations/wirabuana-2025-h-sigmoid/