# Acer rubrum

Sapindaceae. 26 equations apply. Each output lists them most specific first: fitted on this species, on a variety of it, pooled fits that included it, then its genus and family. Within each step, equations the authors advised against go last, then those read from compilations; more trees come first. The order shows how specific the evidence is, not which equation predicts best.

Wood density 0.5 g/cm³, estimated from 515 samples in 11 studies by the [Global Wood Density Database v.2](https://doi.org/10.5281/zenodo.16919509) (Fischer et al. 2026, https://doi.org/10.1111/nph.70860; CC BY 4.0).

## Aboveground biomass

1. Lambert et al. 2005 (this species): Fitted on this species; 177 trees; DBH 2.4–56 cm; Read from the original paper.
   - [Canadian national equation, red maple, dbh only (sum of wood, bark, branches, foliage; Table 3)](https://treeallometry.org/equations/lambert-2005-red-maple/), Lambert et al. 2005: Acer rubrum, Canada; inputs DBH; DBH 2.4–56 cm; 177 trees.
   - [Canadian national equation, red maple, dbh and height (sum of wood, bark, branches, foliage; Table 4)](https://treeallometry.org/equations/lambert-2005-red-maple-dbh-h/), Lambert et al. 2005: Acer rubrum, Canada; inputs DBH + Height; DBH 2.4–56 cm; 177 trees.

2. Westfall et al. 2024 (this species): Fitted on this species; 90–468 trees; DBH 2.54–85.6 cm; Read from the original paper; Checked against values printed in the paper.
   - [NSVB red maple, species-level: total aboveground biomass, modified Wiley model (Eq. 4)](https://treeallometry.org/equations/westfall-2024-acer-rubrum-agb/), Westfall et al. 2024: Acer rubrum, United States; inputs DBH + Height; DBH 2.54–85.6 cm; 468 trees.
   - [NSVB red maple, Warm Continental Division (210): total aboveground biomass (without foliage), modified Wiley model (Eq. 4)](https://treeallometry.org/equations/westfall-2024-acer-rubrum-210-agb/), Westfall et al. 2024: Acer rubrum, United States; inputs DBH + Height; DBH 2.79–54.36 cm; 185 trees.
   - [NSVB red maple, Subtropical Division (230): total aboveground biomass (without foliage), modified Wiley model (Eq. 4)](https://treeallometry.org/equations/westfall-2024-acer-rubrum-230-agb/), Westfall et al. 2024: Acer rubrum, United States; inputs DBH + Height; DBH 2.54–85.6 cm; 175 trees.
   - [NSVB red maple, Hot Continental Regime Mountains (M220): total aboveground biomass (without foliage), modified Wiley model (Eq. 4)](https://treeallometry.org/equations/westfall-2024-acer-rubrum-m220-agb/), Westfall et al. 2024: Acer rubrum, United States; inputs DBH + Height; DBH 2.54–50.55 cm; 90 trees.

3. Chojnacky et al. 2014 (pooled, includes it): Pooled fit on 5 species, this one included; Number of trees not stated; DBH 3–66 cm; Read from the original paper.
   - [North American taxa group: Aceraceae < 0.50 spg (Table 5)](https://treeallometry.org/equations/chojnacky-2014-aceraceae-spg-lt-050/), Chojnacky et al. 2014: Aceraceae < 0.50 spg (Acer macrophyllum, A. pensylvanicum, A. rubrum, A. saccharinum, A. spicatum), United States; inputs DBH; DBH 3–66 cm.

## Stem biomass

1. Lambert et al. 2005 (this species): Fitted on this species; 177 trees; DBH 2.4–56 cm; Read from the original paper.
   - [Canadian national equation, red maple, dbh and height (stem wood plus stem bark; Table 4)](https://treeallometry.org/equations/lambert-2005-red-maple-dbh-h-stem/), Lambert et al. 2005: Acer rubrum, Canada; inputs DBH + Height; DBH 2.4–56 cm; 177 trees.
   - [Canadian national equation, red maple, dbh only (stem wood plus stem bark; Table 3)](https://treeallometry.org/equations/lambert-2005-red-maple-stem/), Lambert et al. 2005: Acer rubrum, Canada; inputs DBH; DBH 2.4–56 cm; 177 trees.

## Branch biomass

1. Westfall et al. 2024 (this species): Fitted on this species; 90–469 trees; DBH 2.54–85.6 cm; Read from the original paper; Checked against values printed in the paper.
   - [NSVB red maple, species-level: total branch biomass (wood and bark), Schumacher-Hall model (Eq. 1)](https://treeallometry.org/equations/westfall-2024-acer-rubrum-branch/), Westfall et al. 2024: Acer rubrum, United States; inputs DBH + Height; DBH 2.54–85.6 cm; 469 trees.
   - [NSVB red maple, Warm Continental Division (210): branch biomass (wood and bark), Schumacher-Hall model (Eq. 1)](https://treeallometry.org/equations/westfall-2024-acer-rubrum-210-branch/), Westfall et al. 2024: Acer rubrum, United States; inputs DBH + Height; DBH 2.79–54.36 cm; 185 trees.
   - [NSVB red maple, Subtropical Division (230): branch biomass (wood and bark), Schumacher-Hall model (Eq. 1)](https://treeallometry.org/equations/westfall-2024-acer-rubrum-230-branch/), Westfall et al. 2024: Acer rubrum, United States; inputs DBH + Height; DBH 2.54–85.6 cm; 176 trees.
   - [NSVB red maple, Hot Continental Regime Mountains (M220): branch biomass (wood and bark), Schumacher-Hall model (Eq. 1)](https://treeallometry.org/equations/westfall-2024-acer-rubrum-m220-branch/), Westfall et al. 2024: Acer rubrum, United States; inputs DBH + Height; DBH 2.54–50.55 cm; 90 trees.

2. Lambert et al. 2005 (this species): Fitted on this species; 177 trees; DBH 2.4–56 cm; Read from the original paper.
   - [Canadian national equation, red maple, dbh only (branches; Table 3)](https://treeallometry.org/equations/lambert-2005-red-maple-branches/), Lambert et al. 2005: Acer rubrum, Canada; inputs DBH; DBH 2.4–56 cm; 177 trees.
   - [Canadian national equation, red maple, dbh and height (branches; Table 4)](https://treeallometry.org/equations/lambert-2005-red-maple-dbh-h-branches/), Lambert et al. 2005: Acer rubrum, Canada; inputs DBH; DBH 2.4–56 cm; 177 trees.

## Foliage biomass

1. Westfall et al. 2024 (this species): Fitted on this species; 60–448 trees; DBH 2.54–85.6 cm; Read from the original paper; Checked against values printed in the paper.
   - [NSVB red maple, species-level: total foliage biomass, Schumacher-Hall model (Eq. 1)](https://treeallometry.org/equations/westfall-2024-acer-rubrum-foliage/), Westfall et al. 2024: Acer rubrum, United States; inputs DBH + Height; DBH 2.54–85.6 cm; 448 trees.
   - [NSVB red maple, Subtropical Division (230): foliage biomass, Schumacher-Hall model (Eq. 1)](https://treeallometry.org/equations/westfall-2024-acer-rubrum-230-foliage/), Westfall et al. 2024: Acer rubrum, United States; inputs DBH + Height; DBH 2.54–85.6 cm; 176 trees.
   - [NSVB red maple, Warm Continental Division (210): foliage biomass, Schumacher-Hall model (Eq. 1)](https://treeallometry.org/equations/westfall-2024-acer-rubrum-210-foliage/), Westfall et al. 2024: Acer rubrum, United States; inputs DBH + Height; DBH 2.79–54.36 cm; 166 trees.
   - [NSVB red maple, Hot Continental Regime Mountains (M220): foliage biomass, Schumacher-Hall model (Eq. 1)](https://treeallometry.org/equations/westfall-2024-acer-rubrum-m220-foliage/), Westfall et al. 2024: Acer rubrum, United States; inputs DBH + Height; DBH 2.54–52.32 cm; 60 trees.

2. Lambert et al. 2005 (this species): Fitted on this species; 177 trees; DBH 2.4–56 cm; Read from the original paper.
   - [Canadian national equation, red maple, dbh and height (foliage; Table 4)](https://treeallometry.org/equations/lambert-2005-red-maple-dbh-h-foliage/), Lambert et al. 2005: Acer rubrum, Canada; inputs DBH; DBH 2.4–56 cm; 177 trees.
   - [Canadian national equation, red maple, dbh only (foliage; Table 3)](https://treeallometry.org/equations/lambert-2005-red-maple-foliage/), Lambert et al. 2005: Acer rubrum, Canada; inputs DBH; DBH 2.4–56 cm; 177 trees.

## Stem volume

1. Westfall et al. 2024 (this species): Fitted on this species; 502–3,068 trees; DBH 2.54–106.17 cm; Read from the original paper; Checked against values printed in the paper.
   - [NSVB red maple, species-level: total stem wood volume (inside bark), Schumacher-Hall model (Eq. 1)](https://treeallometry.org/equations/westfall-2024-acer-rubrum-volume/), Westfall et al. 2024: Acer rubrum, United States; inputs DBH + Height; DBH 2.54–106.17 cm; 3,068 trees.
   - [NSVB red maple, Subtropical Division (230): total stem wood volume (inside bark), Schumacher-Hall model (Eq. 1)](https://treeallometry.org/equations/westfall-2024-acer-rubrum-230-volume/), Westfall et al. 2024: Acer rubrum, United States; inputs DBH + Height; DBH 2.54–106.17 cm; 1,185 trees.
   - [NSVB red maple, Warm Continental Division (210): total stem wood volume (inside bark), Schumacher-Hall model (Eq. 1)](https://treeallometry.org/equations/westfall-2024-acer-rubrum-210-volume/), Westfall et al. 2024: Acer rubrum, United States; inputs DBH + Height; DBH 3.81–81.53 cm; 762 trees.
   - [NSVB red maple, Hot Continental Regime Mountains (M220): total stem wood volume (inside bark), Schumacher-Hall model (Eq. 1)](https://treeallometry.org/equations/westfall-2024-acer-rubrum-m220-volume/), Westfall et al. 2024: Acer rubrum, United States; inputs DBH + Height; DBH 2.54–83.82 cm; 551 trees.
   - [NSVB red maple, Hot Continental Division (220): total stem wood volume (inside bark), Schumacher-Hall model (Eq. 1)](https://treeallometry.org/equations/westfall-2024-acer-rubrum-220-volume/), Westfall et al. 2024: Acer rubrum, United States; inputs DBH + Height; DBH 2.54–76.96 cm; 502 trees.