# Salix nigra

Salicaceae. 12 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 0.41 g/cm³, estimated from 17 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. Westfall et al. 2024 (this species): Fitted on this species; 6 trees; DBH 37.08–63.75 cm; Read from the original paper.
   - [NSVB black willow, species-level (all ecodivisions): total aboveground biomass (without foliage), Schumacher-Hall model (Eq. 1)](https://treeallometry.org/equations/westfall-2024-salix-nigra-agb/), Westfall et al. 2024: Salix nigra, United States; inputs DBH + Height; DBH 37.08–63.75 cm; 6 trees.

2. Paramonov et al. 2022 (same genus): Fitted on the genus Salix; 52 trees across all species; Read from the original paper.
   - [Willow (Salix spp.) aboveground biomass, northern taiga, Arkhangelsk](https://treeallometry.org/equations/paramonov-2022-agb/), Paramonov et al. 2022: Salix, Russia; inputs DBH; 52 trees.

3. Westfall et al. 2024 (same genus): Fitted on the genus Salix; 7 trees across all species; DBH 3.3–25.65 cm; Read from the original paper.
   - [NSVB willow spp., species-level (all ecodivisions): total aboveground biomass (without foliage), Schumacher-Hall model (Eq. 1)](https://treeallometry.org/equations/westfall-2024-salix-spp-agb/), Westfall et al. 2024: Salix, United States; inputs DBH + Height; DBH 3.3–25.65 cm; 7 trees.

## Stem biomass

1. Paramonov et al. 2022 (same genus): Fitted on the genus Salix; 52 trees across all species; Read from the original paper.
   - [Willow (Salix spp.) stem biomass with bark, northern taiga, Arkhangelsk](https://treeallometry.org/equations/paramonov-2022-stem/), Paramonov et al. 2022: Salix, Russia; inputs DBH; 52 trees.

## Branch biomass

1. Westfall et al. 2024 (this species): Fitted on this species; 6 trees; DBH 37.08–63.75 cm; Read from the original paper.
   - [NSVB black willow, species-level (all ecodivisions): branch biomass (wood and bark), Schumacher-Hall model (Eq. 1)](https://treeallometry.org/equations/westfall-2024-salix-nigra-branch/), Westfall et al. 2024: Salix nigra, United States; inputs DBH + Height; DBH 37.08–63.75 cm; 6 trees.

2. Paramonov et al. 2022 (same genus): Fitted on the genus Salix; 52 trees across all species; Read from the original paper.
   - [Willow (Salix spp.) branch biomass, northern taiga, Arkhangelsk](https://treeallometry.org/equations/paramonov-2022-branch/), Paramonov et al. 2022: Salix, Russia; inputs DBH; 52 trees.

3. Westfall et al. 2024 (same genus): Fitted on the genus Salix; 7 trees across all species; DBH 3.3–25.65 cm; Read from the original paper.
   - [NSVB willow spp., species-level (all ecodivisions): branch biomass (wood and bark), Schumacher-Hall model (Eq. 1)](https://treeallometry.org/equations/westfall-2024-salix-spp-branch/), Westfall et al. 2024: Salix, United States; inputs DBH + Height; DBH 3.3–25.65 cm; 7 trees.

## Foliage biomass

1. Westfall et al. 2024 (this species): Fitted on this species; 45 trees; DBH 4.32–63.75 cm; Read from the original paper.
   - [NSVB black willow, species-level (all ecodivisions): foliage biomass, Schumacher-Hall model (Eq. 1)](https://treeallometry.org/equations/westfall-2024-salix-nigra-foliage/), Westfall et al. 2024: Salix nigra, United States; inputs DBH + Height; DBH 4.32–63.75 cm; 45 trees.

2. Paramonov et al. 2022 (same genus): Fitted on the genus Salix; 52 trees across all species; Read from the original paper.
   - [Willow (Salix spp.) foliage biomass, northern taiga, Arkhangelsk](https://treeallometry.org/equations/paramonov-2022-foliage/), Paramonov et al. 2022: Salix, Russia; inputs DBH; 52 trees.

3. Westfall et al. 2024 (same genus): Fitted on the genus Salix; 7 trees across all species; DBH 3.3–25.65 cm; Read from the original paper.
   - [NSVB willow spp., species-level (all ecodivisions): foliage biomass, Schumacher-Hall model (Eq. 1)](https://treeallometry.org/equations/westfall-2024-salix-spp-foliage/), Westfall et al. 2024: Salix, United States; inputs DBH + Height; DBH 3.3–25.65 cm; 7 trees.

## Stem volume

1. Westfall et al. 2024 (this species): Fitted on this species; 41 trees; DBH 13.46–66.8 cm; Read from the original paper.
   - [NSVB black willow, species-level (all ecodivisions): total stem wood volume (inside bark), Schumacher-Hall model (Eq. 1)](https://treeallometry.org/equations/westfall-2024-salix-nigra-volume/), Westfall et al. 2024: Salix nigra, United States; inputs DBH + Height; DBH 13.46–66.8 cm; 41 trees.

2. Westfall et al. 2024 (same genus): Fitted on the genus Salix; 7 trees across all species; DBH 3.3–25.65 cm; Read from the original paper.
   - [NSVB willow spp., species-level (all ecodivisions): total stem wood volume (inside bark), Schumacher-Hall model (Eq. 1)](https://treeallometry.org/equations/westfall-2024-salix-spp-volume/), Westfall et al. 2024: Salix, United States; inputs DBH + Height; DBH 3.3–25.65 cm; 7 trees.