# Picea mariana

Pinaceae. 8 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.

## Aboveground biomass

1. Lambert et al. 2005 (this species): Fitted on this species; 1,534 trees; DBH 1.6–37.2 cm; Read from the original paper.
   - [Canadian national equation, black spruce, dbh only (sum of wood, bark, branches, foliage; Table 3)](https://treeallometry.org/equations/lambert-2005-black-spruce/), Lambert et al. 2005: Picea mariana, Canada; inputs DBH; DBH 1.6–37.2 cm; 1,534 trees.

2. Poudel et al. 2019 (this species): Fitted on this species; 67 trees; DBH 3.5–38.4 cm; Read from the original paper.
   - [Black spruce total aboveground biomass from DBH and height (Table 4)](https://treeallometry.org/equations/poudel-2019-picea-mariana/), Poudel et al. 2019: Picea mariana, United States; inputs DBH + Height; DBH 3.5–38.4 cm; 67 trees.

## Stem biomass

1. Flade et al. 2021 (same genus): Fitted on the genus Picea; Number of trees not stated; Read from the original paper.
   - [Picea spp. stem biomass, cross-sectional area at 0.3 m (LLRC)](https://treeallometry.org/equations/flade-2021-picea-stem-llrc/), Flade et al. 2021: Picea spp., Canada; inputs D30.
   - [Picea spp. stem biomass, cross-sectional area at 0.3 m (NLS)](https://treeallometry.org/equations/flade-2021-picea-stem-nls/), Flade et al. 2021: Picea spp., Canada; inputs D30.

## Branch biomass

1. Flade et al. 2021 (same genus): Fitted on the genus Picea; Number of trees not stated; Read from the original paper.
   - [Picea spp. branch biomass, cross-sectional area at 0.3 m (LLRC)](https://treeallometry.org/equations/flade-2021-picea-branch-llrc/), Flade et al. 2021: Picea spp., Canada; inputs D30.
   - [Picea spp. branch biomass, cross-sectional area at 0.3 m (NLS)](https://treeallometry.org/equations/flade-2021-picea-branch-nls/), Flade et al. 2021: Picea spp., Canada; inputs D30.

## Foliage biomass

1. Flade et al. 2021 (same genus): Fitted on the genus Picea; Number of trees not stated; Read from the original paper.
   - [Picea spp. leaf biomass, cross-sectional area at 0.3 m (LLRC)](https://treeallometry.org/equations/flade-2021-picea-leaf-llrc/), Flade et al. 2021: Picea spp., Canada; inputs D30.
   - [Picea spp. leaf biomass, cross-sectional area at 0.3 m (NLS)](https://treeallometry.org/equations/flade-2021-picea-leaf-nls/), Flade et al. 2021: Picea spp., Canada; inputs D30.