# Quercus humboldtii

Fagaceae. 23 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. Giraldo-Salazar et al. 2025 (this species): Fitted on this species; 20 trees; DBH 4.75–24.9 cm; Read from the original paper.
   - [Quercus humboldtii AGB, DBH only (13-year restoration plantation)](https://treeallometry.org/equations/giraldo-salazar-2025-quercus/), Giraldo-Salazar et al. 2025: Quercus humboldtii, Colombia; inputs DBH; DBH 4.75–24.9 cm; 20 trees.

2. Cortés-Sánchez et al. 2019 (same genus): Fitted on 6 other Quercus species, not this one; 165 trees across all species; DBH 4.8–48.6 cm; Read from the original paper.
   - [Six Guanajuato oaks pooled, total aboveground biomass fitted directly (model 3)](https://treeallometry.org/equations/cortes-sanchez-2019-bt-m3/), Cortés-Sánchez et al. 2019: Quercus (six species: rugosa, obtusata, sideroxyla, coccolobifolia, laurina, candicans), Mexico; inputs DBH + Height; DBH 4.8–48.6 cm; 165 trees.
   - [Six Guanajuato oaks pooled, total aboveground biomass fitted directly (model 4)](https://treeallometry.org/equations/cortes-sanchez-2019-bt-m4/), Cortés-Sánchez et al. 2019: Quercus (six species: rugosa, obtusata, sideroxyla, coccolobifolia, laurina, candicans), Mexico; inputs Wood density + DBH + Height; DBH 4.8–48.6 cm; 165 trees.
   - [Six Guanajuato oaks pooled, system 1 (D and H): total aboveground biomass (sum of components)](https://treeallometry.org/equations/cortes-sanchez-2019-sys1-agb/), Cortés-Sánchez et al. 2019: Quercus (six species: rugosa, obtusata, sideroxyla, coccolobifolia, laurina, candicans), Mexico; inputs DBH + Height; DBH 4.8–48.6 cm; 165 trees.

3. Meng et al. 2021 (same genus): Fitted on 2 other Quercus species, not this one; 159 trees across all species; DBH 1.5–33 cm; Read from the original paper.
   - [Oak aboveground biomass from D, additive system 1 (Table 4)](https://treeallometry.org/equations/meng-2021-agb-d/), Meng et al. 2021: Quercus (Q. mongolica and Q. wutaishanica), China; inputs DBH; DBH 1.5–33 cm; 159 trees.

4. Du et al. 2026 (same genus): Fitted on the genus Quercus; 157 trees across all species; DBH 3.5–38.9 cm; Read from the original paper.
   - [Oak aboveground biomass (compatible total-biomass system)](https://treeallometry.org/equations/du-2026-oak-agb/), Du et al. 2026: Quercus, China; inputs DBH + Height; DBH 3.5–38.9 cm; 157 trees.

5. Vargas-Larreta et al. 2017 (same genus): Fitted on the genus Quercus; Number of trees not stated; Read from the original paper.
   - [Quercus total aboveground biomass](https://treeallometry.org/equations/vargas-larreta-2017-all-oaks-agb/), Vargas-Larreta et al. 2017: Quercus, Mexico; inputs DBH + Height.

6. Chojnacky et al. 2014 (same family): Fitted on the family Fagaceae; Number of trees not stated; DBH 3–89 cm; Read from the original paper.
   - [North American taxa group: Fagaceae, deciduous (Table 5)](https://treeallometry.org/equations/chojnacky-2014-fagaceae-deciduous/), Chojnacky et al. 2014: Fagaceae, United States; inputs DBH; DBH 3–89 cm.

## Total biomass

1. Du et al. 2026 (same genus): Fitted on the genus Quercus; 157 trees across all species; DBH 3.5–38.9 cm; Read from the original paper.
   - [Oak total tree biomass (compatible total-biomass system)](https://treeallometry.org/equations/du-2026-oak-total/), Du et al. 2026: Quercus, China; inputs DBH + Height; DBH 3.5–38.9 cm; 157 trees.

## Stem biomass

1. Cortés-Sánchez et al. 2019 (same genus): Fitted on 6 other Quercus species, not this one; 165 trees across all species; DBH 4.8–48.6 cm; Read from the original paper.
   - [Six Guanajuato oaks pooled, system 1 (D and H): stem biomass](https://treeallometry.org/equations/cortes-sanchez-2019-sys1-stem/), Cortés-Sánchez et al. 2019: Quercus (six species: rugosa, obtusata, sideroxyla, coccolobifolia, laurina, candicans), Mexico; inputs DBH + Height; DBH 4.8–48.6 cm; 165 trees.
   - [Six Guanajuato oaks pooled, system 2 (wood density, D and H): stem biomass](https://treeallometry.org/equations/cortes-sanchez-2019-sys2-stem/), Cortés-Sánchez et al. 2019: Quercus (six species: rugosa, obtusata, sideroxyla, coccolobifolia, laurina, candicans), Mexico; inputs Wood density + DBH + Height; DBH 4.8–48.6 cm; 165 trees.

## Branch biomass

1. Cortés-Sánchez et al. 2019 (same genus): Fitted on 6 other Quercus species, not this one; 165 trees across all species; DBH 4.8–48.6 cm; Read from the original paper.
   - [Six Guanajuato oaks pooled, system 1 (D and H): branch biomass](https://treeallometry.org/equations/cortes-sanchez-2019-sys1-branch/), Cortés-Sánchez et al. 2019: Quercus (six species: rugosa, obtusata, sideroxyla, coccolobifolia, laurina, candicans), Mexico; inputs DBH + Height; DBH 4.8–48.6 cm; 165 trees.
   - [Six Guanajuato oaks pooled, system 2 (wood density, D and H): branch biomass](https://treeallometry.org/equations/cortes-sanchez-2019-sys2-branch/), Cortés-Sánchez et al. 2019: Quercus (six species: rugosa, obtusata, sideroxyla, coccolobifolia, laurina, candicans), Mexico; inputs Wood density + DBH + Height; DBH 4.8–48.6 cm; 165 trees.

2. Meng et al. 2021 (same genus): Fitted on 2 other Quercus species, not this one; 159 trees across all species; DBH 1.5–33 cm; Read from the original paper.
   - [Oak branch biomass from D, additive system 1 (Table 4)](https://treeallometry.org/equations/meng-2021-branch-d/), Meng et al. 2021: Quercus (Q. mongolica and Q. wutaishanica), China; inputs DBH; DBH 1.5–33 cm; 159 trees.
   - [Oak branch biomass from D and crown width, additive system 2 (Table 4)](https://treeallometry.org/equations/meng-2021-branch-dcw/), Meng et al. 2021: Quercus (Q. mongolica and Q. wutaishanica), China; inputs DBH + Crown diameter; DBH 1.5–33 cm; 159 trees.

3. Vargas-Larreta et al. 2017 (same genus): Fitted on the genus Quercus; Number of trees not stated; Read from the original paper.
   - [Quercus branch biomass (wood and bark)](https://treeallometry.org/equations/vargas-larreta-2017-all-oaks-branch/), Vargas-Larreta et al. 2017: Quercus, Mexico; inputs DBH + Height.

## Foliage biomass

1. Cortés-Sánchez et al. 2019 (same genus): Fitted on 6 other Quercus species, not this one; 165 trees across all species; DBH 4.8–48.6 cm; Read from the original paper.
   - [Six Guanajuato oaks pooled, system 1 (D and H): foliage (twigs with leaves) biomass](https://treeallometry.org/equations/cortes-sanchez-2019-sys1-foliage/), Cortés-Sánchez et al. 2019: Quercus (six species: rugosa, obtusata, sideroxyla, coccolobifolia, laurina, candicans), Mexico; inputs DBH; DBH 4.8–48.6 cm; 165 trees.

2. Meng et al. 2021 (same genus): Fitted on 2 other Quercus species, not this one; 159 trees across all species; DBH 1.5–33 cm; Read from the original paper.
   - [Oak foliage biomass from D, additive system 1 (Table 4)](https://treeallometry.org/equations/meng-2021-foliage-d/), Meng et al. 2021: Quercus (Q. mongolica and Q. wutaishanica), China; inputs DBH; DBH 1.5–33 cm; 159 trees.
   - [Oak foliage biomass from D and crown width, additive system 2 (Table 4)](https://treeallometry.org/equations/meng-2021-foliage-dcw/), Meng et al. 2021: Quercus (Q. mongolica and Q. wutaishanica), China; inputs DBH + Crown diameter; DBH 1.5–33 cm; 159 trees.

3. Vargas-Larreta et al. 2017 (same genus): Fitted on the genus Quercus; Number of trees not stated; Read from the original paper.
   - [Quercus foliage biomass](https://treeallometry.org/equations/vargas-larreta-2017-all-oaks-foliage/), Vargas-Larreta et al. 2017: Quercus, Mexico; inputs DBH.

## Root biomass

1. Meng et al. 2021 (same genus): Fitted on 2 other Quercus species, not this one; 53 trees across all species; DBH 1.5–32.8 cm; Read from the original paper.
   - [Oak root biomass from D (Table 3)](https://treeallometry.org/equations/meng-2021-root-d/), Meng et al. 2021: Quercus (Q. mongolica and Q. wutaishanica), China; inputs DBH; DBH 1.5–32.8 cm; 53 trees.

2. Du et al. 2026 (same genus): Fitted on the genus Quercus; 50 trees across all species; Read from the original paper.
   - [Oak root biomass (compatible total-biomass system)](https://treeallometry.org/equations/du-2026-oak-root/), Du et al. 2026: Quercus, China; inputs DBH + Height; 50 trees.

3. Röhling et al. 2019 (same genus): Fitted on 2 other Quercus species, not this one; 39 trees across all species; DBH 7.4–42 cm; Read from the original paper.
   - [Quercus robur and Q. petraea, Germany, belowground biomass from DBH (Eq. 4, Tab. 1)](https://treeallometry.org/equations/rohling-2019-bgb-oak/), Röhling et al. 2019: Quercus (Q. robur and Q. petraea pooled), Germany; inputs DBH; DBH 7.4–42 cm; 39 trees.

## General equations that may apply

Fitted on many species across the tropics or the world, so not ranked against the ones above.

- [Dry tropical zone AGB from DBH (Eq. 3.2.1)](https://treeallometry.org/equations/brown-1997-dry/), Brown 1997: Tropical broadleaf trees (mixed species), Pantropical; inputs DBH; DBH 5–40 cm; 28 trees.
- [Moist tropical zone AGB, power law (Eq. 3.2.4)](https://treeallometry.org/equations/brown-1997-moist-power/), Brown 1997: Tropical broadleaf trees (mixed species), Pantropical; inputs DBH; DBH 5–148 cm; 170 trees.
- [Moist tropical zone AGB, quadratic (Eq. 3.2.3)](https://treeallometry.org/equations/brown-1997-moist-quadratic/), Brown 1997: Tropical broadleaf trees (mixed species), Pantropical; inputs DBH; DBH 5–148 cm; 170 trees.
- [Wet tropical zone AGB, quadratic (Brown 1997 Eq. 3.2.5)](https://treeallometry.org/equations/brown-iverson-1992-wet/), Brown & Iverson 1992: Tropical broadleaf trees (mixed species), Pantropical; inputs DBH; DBH 4–112 cm; 169 trees; from a secondary source.
- [Dry forest AGB with height (Model I)](https://treeallometry.org/equations/chave-2005-dry-h/), Chave et al. 2005: Tropical broadleaf trees, Pantropical; inputs Wood density + DBH + Height; DBH 5–156 cm.
- [Dry forest AGB without height (Model II)](https://treeallometry.org/equations/chave-2005-dry-noh/), Chave et al. 2005: Tropical broadleaf trees, Pantropical; inputs Wood density + DBH; DBH 5–156 cm.
- [Moist forest AGB with height (Model I)](https://treeallometry.org/equations/chave-2005-moist-h/), Chave et al. 2005: Tropical broadleaf trees, Pantropical; inputs Wood density + DBH + Height; DBH 5–156 cm.
- [Moist forest AGB without height (Model II)](https://treeallometry.org/equations/chave-2005-moist-noh/), Chave et al. 2005: Tropical broadleaf trees, Pantropical; inputs Wood density + DBH; DBH 5–156 cm.
- [Wet forest AGB with height (Model I)](https://treeallometry.org/equations/chave-2005-wet-h/), Chave et al. 2005: Tropical broadleaf trees, Pantropical; inputs Wood density + DBH + Height; DBH 5–156 cm.
- [Wet forest AGB without height (Model II)](https://treeallometry.org/equations/chave-2005-wet-noh/), Chave et al. 2005: Tropical broadleaf trees, Pantropical; inputs Wood density + DBH; DBH 5–156 cm.
- [Pantropical AGB with height (Eq. 4)](https://treeallometry.org/equations/chave-2014-eq4/), Chave et al. 2014: Tropical trees (58 sites), Pantropical; inputs Wood density + DBH + Height; DBH 5–212 cm; 4,004 trees.
- [Pantropical AGB with height, exponent fixed at 1 (Eq. 5)](https://treeallometry.org/equations/chave-2014-eq5/), Chave et al. 2014: Tropical trees (58 sites), Pantropical; inputs Wood density + DBH + Height; DBH 5–212 cm; 4,004 trees.
- [Pantropical height–diameter model with stress index E (Eq. 6a)](https://treeallometry.org/equations/chave-2014-eq6a/), Chave et al. 2014: Tropical trees (58 sites), Pantropical; inputs E + DBH; DBH 5–212 cm.
- [Pantropical AGB without height, with stress index E (Eq. 7)](https://treeallometry.org/equations/chave-2014-eq7/), Chave et al. 2014: Tropical trees (58 sites), Pantropical; inputs E + Wood density + DBH; DBH 5–212 cm; 4,004 trees.
- [Pan moist tropical AGB from DBH, height and wood density (Table 4, model 5)](https://treeallometry.org/equations/djomo-2010-pan-d-d2h-rho/), Djomo et al. 2010: Mixed species, pan moist tropical forests (Campo-Ma'an plus data from Asia and South America), Pantropical; inputs DBH + Height + Wood density; DBH 1–138 cm; 274 trees.
- [Pan moist tropical AGB from DBH (Table 4, model 2)](https://treeallometry.org/equations/djomo-2010-pan-d/), Djomo et al. 2010: Mixed species, pan moist tropical forests (Campo-Ma'an plus data from Asia and South America), Pantropical; inputs DBH; DBH 1–148 cm; 443 trees.
- [Pan moist tropical AGB from D²H (Table 4, model 3)](https://treeallometry.org/equations/djomo-2010-pan-d2h/), Djomo et al. 2010: Mixed species, pan moist tropical forests (Campo-Ma'an plus data from Asia and South America), Pantropical; inputs DBH + Height; DBH 1–138 cm; 274 trees.
- [Pantropical Weibull height–diameter model](https://treeallometry.org/equations/feldpausch-2012-weibull-pantropical/), Feldpausch et al. 2012: Tropical forest trees (permanent plots), Pantropical; inputs DBH; DBH from 10 cm; 42,656 trees.