# Thuja occidentalis

Cupressaceae. 17 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 0.29 g/cm³, estimated from 23 samples in 4 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; 184 trees; DBH 2.1–66.2 cm; Read from the original paper.
   - [Canadian national equation, eastern white-cedar, dbh only (sum of wood, bark, branches, foliage; Table 3)](https://treeallometry.org/equations/lambert-2005-eastern-white-cedar/), Lambert et al. 2005: Thuja occidentalis, Canada; inputs DBH; DBH 2.1–66.2 cm; 184 trees.
   - [Canadian national equation, eastern white-cedar, dbh and height (sum of wood, bark, branches, foliage; Table 4)](https://treeallometry.org/equations/lambert-2005-eastern-white-cedar-dbh-h/), Lambert et al. 2005: Thuja occidentalis, Canada; inputs DBH + Height; DBH 2.1–66.2 cm; 184 trees.

2. Chojnacky et al. 2014 (this species): Fitted on this species; Number of trees not stated; DBH 3–66 cm; Read from the original paper.
   - [North American taxa group: Cupressaceae < 0.30 spg (Table 5)](https://treeallometry.org/equations/chojnacky-2014-cupressaceae-spg-lt-030/), Chojnacky et al. 2014: Thuja occidentalis, United States; inputs DBH; DBH 3–66 cm.

3. Westfall et al. 2024 (this species): Fitted on this species; 127 trees; DBH 3.05–50.29 cm; Read from the original paper.
   - [NSVB northern white-cedar, species-level (all ecodivisions): total aboveground biomass (without foliage), segmented model (Eq. 2), D ≥ 9 in (22.86 cm)](https://treeallometry.org/equations/westfall-2024-thuja-occidentalis-agb-large/), Westfall et al. 2024: Thuja occidentalis, United States; inputs DBH + Height; DBH 22.86–50.29 cm; 127 trees.
   - [NSVB northern white-cedar, species-level (all ecodivisions): total aboveground biomass (without foliage), segmented model (Eq. 2), D < 9 in (22.86 cm)](https://treeallometry.org/equations/westfall-2024-thuja-occidentalis-agb-small/), Westfall et al. 2024: Thuja occidentalis, United States; inputs DBH + Height; DBH 3.05–22.86 cm; 127 trees.

## Stem biomass

1. Lambert et al. 2005 (this species): Fitted on this species; 184 trees; DBH 2.1–66.2 cm; Read from the original paper.
   - [Canadian national equation, eastern white-cedar, dbh and height (stem wood plus stem bark; Table 4)](https://treeallometry.org/equations/lambert-2005-eastern-white-cedar-dbh-h-stem/), Lambert et al. 2005: Thuja occidentalis, Canada; inputs DBH + Height; DBH 2.1–66.2 cm; 184 trees.
   - [Canadian national equation, eastern white-cedar, dbh only (stem wood plus stem bark; Table 3)](https://treeallometry.org/equations/lambert-2005-eastern-white-cedar-stem/), Lambert et al. 2005: Thuja occidentalis, Canada; inputs DBH; DBH 2.1–66.2 cm; 184 trees.

## Branch biomass

1. Lambert et al. 2005 (this species): Fitted on this species; 184 trees; DBH 2.1–66.2 cm; Read from the original paper.
   - [Canadian national equation, eastern white-cedar, dbh only (branches; Table 3)](https://treeallometry.org/equations/lambert-2005-eastern-white-cedar-branches/), Lambert et al. 2005: Thuja occidentalis, Canada; inputs DBH; DBH 2.1–66.2 cm; 184 trees.
   - [Canadian national equation, eastern white-cedar, dbh and height (branches; Table 4)](https://treeallometry.org/equations/lambert-2005-eastern-white-cedar-dbh-h-branches/), Lambert et al. 2005: Thuja occidentalis, Canada; inputs DBH + Height; DBH 2.1–66.2 cm; 184 trees.

2. Westfall et al. 2024 (this species): Fitted on this species; 127 trees; DBH 3.05–50.29 cm; Read from the original paper.
   - [NSVB northern white-cedar, species-level (all ecodivisions): branch biomass (wood and bark), Schumacher-Hall model (Eq. 1)](https://treeallometry.org/equations/westfall-2024-thuja-occidentalis-branch/), Westfall et al. 2024: Thuja occidentalis, United States; inputs DBH + Height; DBH 3.05–50.29 cm; 127 trees.

## Foliage biomass

1. Lambert et al. 2005 (this species): Fitted on this species; 184 trees; DBH 2.1–66.2 cm; Read from the original paper.
   - [Canadian national equation, eastern white-cedar, dbh and height (foliage; Table 4)](https://treeallometry.org/equations/lambert-2005-eastern-white-cedar-dbh-h-foliage/), Lambert et al. 2005: Thuja occidentalis, Canada; inputs DBH + Height; DBH 2.1–66.2 cm; 184 trees.
   - [Canadian national equation, eastern white-cedar, dbh only (foliage; Table 3)](https://treeallometry.org/equations/lambert-2005-eastern-white-cedar-foliage/), Lambert et al. 2005: Thuja occidentalis, Canada; inputs DBH; DBH 2.1–66.2 cm; 184 trees.

2. Westfall et al. 2024 (this species): Fitted on this species; 127 trees; DBH 3.05–50.29 cm; Read from the original paper.
   - [NSVB northern white-cedar, species-level (all ecodivisions): foliage biomass, Schumacher-Hall model (Eq. 1)](https://treeallometry.org/equations/westfall-2024-thuja-occidentalis-foliage/), Westfall et al. 2024: Thuja occidentalis, United States; inputs DBH + Height; DBH 3.05–50.29 cm; 127 trees.

## Stem volume

1. Westfall et al. 2024 (this species): Fitted on this species; 208–276 trees; DBH 3.05–50.29 cm; Read from the original paper.
   - [NSVB northern white-cedar, species-level (all ecodivisions): total stem wood volume (inside bark), segmented model (Eq. 2), D ≥ 9 in (22.86 cm)](https://treeallometry.org/equations/westfall-2024-thuja-occidentalis-volume-large/), Westfall et al. 2024: Thuja occidentalis, United States; inputs DBH + Height; DBH 22.86–50.29 cm; 276 trees.
   - [NSVB northern white-cedar, species-level (all ecodivisions): total stem wood volume (inside bark), segmented model (Eq. 2), D < 9 in (22.86 cm)](https://treeallometry.org/equations/westfall-2024-thuja-occidentalis-volume-small/), Westfall et al. 2024: Thuja occidentalis, United States; inputs DBH + Height; DBH 3.05–22.86 cm; 276 trees.
   - [NSVB northern white-cedar, Warm Continental Division (210): total stem wood volume (inside bark), segmented model (Eq. 2), D ≥ 9 in (22.86 cm)](https://treeallometry.org/equations/westfall-2024-thuja-occidentalis-210-volume-large/), Westfall et al. 2024: Thuja occidentalis, United States; inputs DBH + Height; DBH 22.86–50.29 cm; 208 trees.
   - [NSVB northern white-cedar, Warm Continental Division (210): total stem wood volume (inside bark), segmented model (Eq. 2), D < 9 in (22.86 cm)](https://treeallometry.org/equations/westfall-2024-thuja-occidentalis-210-volume-small/), Westfall et al. 2024: Thuja occidentalis, United States; inputs DBH + Height; DBH 3.05–22.86 cm; 208 trees.