# Xu et al. 2015: Improving allometry models to estimate the above- and belowground biomass of subtropical forest, China

Xu, Y., Zhang, J., Franklin, S. B., et al. (2015). Improving allometry models to estimate the above- and belowground biomass of subtropical forest, China. Ecosphere, 6(12), 289.

- DOI: https://doi.org/10.1890/es15-00198.1
- Access: open access
- Copy we read: https://esajournals.onlinelibrary.wiley.com/doi/full/10.1890/ES15-00198.1
- Status: no retraction or correction notice recorded (Crossref is asked weekly); last checked 2026-11-02
- Page: https://treeallometry.org/sources/xu-2015/

## Equations from this source (6)

### Subtropical China AGB from D and wood density (Model I.4)

Aboveground biomass for 41 subtropical forest tree species (Fagus lucida, Castanea seguinii, Carpinus viminea and others), China. Inputs: DBH + Wood density. 147 trees.

As printed (Recommended model when height is not available, p. 7 (Table 2, model I.4)):

> AGB = exp(−1.8226 + 2.4105ln(D) + 0.5781ln(WD))

Page: https://treeallometry.org/equations/xu-2015-i4-dwd/

### Subtropical China AGB from D, H and wood density (Model I.1)

Aboveground biomass for 41 subtropical forest tree species (Fagus lucida, Castanea seguinii, Carpinus viminea and others), China. Inputs: DBH + Height + Wood density. 147 trees.

As printed (Recommended model when height is available, p. 7 (Table 2, model I.1)):

> AGB = exp(−2.334 + 2.118ln(D) + 0.5436ln(H) + 0.5953ln(WD))

Page: https://treeallometry.org/equations/xu-2015-i1-dhwd/

### Subtropical China AGB from D²H (Model III.1)

Aboveground biomass for 41 subtropical forest tree species (Fagus lucida, Castanea seguinii, Carpinus viminea and others), China. Inputs: DBH + Height. 147 trees.

As printed (Table 2, model III.1):

> III.1  ln(AGB) = a + bln(D²H)   −3.062  0.949

Page: https://treeallometry.org/equations/xu-2015-iii1-d2h/

### Subtropical China AGB from D²H and wood density (Model I.2)

Aboveground biomass for 41 subtropical forest tree species (Fagus lucida, Castanea seguinii, Carpinus viminea and others), China. Inputs: DBH + Height + Wood density. 147 trees.

As printed (Table 2, model I.2):

> I.2  ln(AGB) = a + bln(D²H) + cln(WD)   −2.672  0.944  0.615

Page: https://treeallometry.org/equations/xu-2015-i2-d2hwd/

### Subtropical China AGB from D²H x wood density (Model I.3)

Aboveground biomass for 41 subtropical forest tree species (Fagus lucida, Castanea seguinii, Carpinus viminea and others), China. Inputs: DBH + Height + Wood density. 147 trees.

As printed (Table 2, model I.3):

> I.3  ln(AGB) = a + bln(D²H × WD)   −2.456  0.939

Page: https://treeallometry.org/equations/xu-2015-i3-d2hxwd/

### Subtropical China root biomass from D

Root biomass for 8 subtropical forest tree species (23 root systems), China. Inputs: DBH. 23 trees.

As printed (BGB models with diameter, p. 8):

> BGB = exp(−2.80346 + 2.0441ln(D))

Page: https://treeallometry.org/equations/xu-2015-bgb-d/