# Picea abies

Pinaceae. 18 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. Repola 2009 (this species): Fitted on this species; 166 trees; Read from the original paper.
   - [Norway spruce total above-ground biomass, Model 1c (Eq. 17)](https://treeallometry.org/equations/repola-2009-picea-abies-total/), Repola 2009: Picea abies, Finland; inputs DBH + Height; 166 trees.

2. Čihák & Vejpustková 2018 (this species): Fitted on this species; 139 trees; Read from the original paper.
   - [Norway spruce, Czech Republic: Total aboveground biomass from D (Table 2)](https://treeallometry.org/equations/cihak-2018-agb-d/), Čihák & Vejpustková 2018: Picea abies, Czechia; inputs DBH; 139 trees.
   - [Norway spruce, Czech Republic: Total aboveground biomass from D and H/D (Table 2)](https://treeallometry.org/equations/cihak-2018-agb-d-hd/), Čihák & Vejpustková 2018: Picea abies, Czechia; inputs DBH + Height; 139 trees.

3. Repola & Ahnlund Ulvcrona 2014 (this species): Fitted on this species; 68 trees; DBH 1–21 cm; Read from the original paper.
   - [Norway spruce aboveground biomass, young dense stands, N Sweden (Table 5)](https://treeallometry.org/equations/repola-2014-agb-spruce/), Repola & Ahnlund Ulvcrona 2014: Picea abies, Sweden; inputs DBH; DBH 1–21 cm; 68 trees.

4. Forrester et al. 2017 (this species): Fitted on this species; Number of trees not stated; DBH 1–82 cm; Read from the original paper.
   - [European general equation, Picea abies, aboveground, diameter only (Eq. 3)](https://treeallometry.org/equations/forrester-2017-picea-abies/), Forrester et al. 2017: Picea abies, Europe (latitude min/mean/max 42.7 / 53.5 / 65 °N); inputs DBH; DBH 1–82 cm.

## Stem biomass

1. Čihák & Vejpustková 2018 (this species): Fitted on this species; 139 trees; Read from the original paper.
   - [Norway spruce, Czech Republic: Stem biomass from D (Table 2)](https://treeallometry.org/equations/cihak-2018-stem-d/), Čihák & Vejpustková 2018: Picea abies, Czechia; inputs DBH; 139 trees.
   - [Norway spruce, Czech Republic: Stem biomass from D and H/D (Table 2)](https://treeallometry.org/equations/cihak-2018-stem-d-hd/), Čihák & Vejpustková 2018: Picea abies, Czechia; inputs DBH + Height; 139 trees.

2. Repola & Ahnlund Ulvcrona 2014 (this species): Fitted on this species; 68 trees; DBH 1–21 cm; Read from the original paper.
   - [Norway spruce stem biomass, young dense stands, N Sweden (Table 5)](https://treeallometry.org/equations/repola-2014-stem-spruce/), Repola & Ahnlund Ulvcrona 2014: Picea abies, Sweden; inputs DBH; DBH 1–21 cm; 68 trees.

3. 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. Repola & Ahnlund Ulvcrona 2014 (this species): Fitted on this species; 68 trees; DBH 1–21 cm; Read from the original paper.
   - [Norway spruce living branch biomass, young dense stands, N Sweden (Table 5)](https://treeallometry.org/equations/repola-2014-branch-spruce/), Repola & Ahnlund Ulvcrona 2014: Picea abies, Sweden; inputs DBH + Height; DBH 1–21 cm; 68 trees.

2. 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. Čihák & Vejpustková 2018 (this species): Fitted on this species; 139 trees; Read from the original paper.
   - [Norway spruce, Czech Republic: Foliage biomass from D (Table 2)](https://treeallometry.org/equations/cihak-2018-foliage-d/), Čihák & Vejpustková 2018: Picea abies, Czechia; inputs DBH; 139 trees.
   - [Norway spruce, Czech Republic: Foliage biomass from D and H/D (Table 2)](https://treeallometry.org/equations/cihak-2018-foliage-d-hd/), Čihák & Vejpustková 2018: Picea abies, Czechia; inputs DBH + Height; 139 trees.

2. Repola & Ahnlund Ulvcrona 2014 (this species): Fitted on this species; 68 trees; DBH 1–21 cm; Read from the original paper.
   - [Norway spruce foliage biomass, young dense stands, N Sweden (Table 5)](https://treeallometry.org/equations/repola-2014-foliage-spruce/), Repola & Ahnlund Ulvcrona 2014: Picea abies, Sweden; inputs DBH; DBH 1–21 cm; 68 trees.

3. 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.