Forest dimensions and growth metrics

Fundamental mensuration metrics measured and calculated at tree level (diameter at breast height, height, crown dimensions) and stand level (basal area, quadratic mean diameter, dominant height).

Plot-level variables

• Age — decimal  •  years  •  output: T

  Mean age of the forest stand in the plot.

  Accepted inventory aliases: edad, t, stand_age

• Density — decimal  •  trees/ha  •  output: N  •  multi-species: sp1, sp2, sp3

  Number of trees per hectare.

  Accepted inventory aliases: n, pies_ha, densidad, density

  Simulation breakdown: This variable is automatically expanded for each target stand species (Density_SP1, Density_SP2, Density_SP3).

• Species {num} density proportion (N_PROPORTION) — decimal  •  ratio  •  output: N_prop  •  multi-species: sp1, sp2, sp3

  Proportion of trees of species {num} relative to total stand density.

  Accepted inventory aliases: n_prop, n_proportion, proporcion_n, {sp_lower}_n_prop, {sp_lower}_n_proportion, n_prop_{sp_lower}

  Simulation breakdown: This variable is automatically expanded for each target stand species (Species SP1 density proportion, Species SP2 density proportion, Species SP3 density proportion).

• quadratic_mean_diameter (QM_DBH) — decimal  •  cm  •  output: dg  •  multi-species: sp1, sp2, sp3

  Quadratic mean diameter of the plot.

  Simulation breakdown: This variable is automatically expanded for each target stand species (quadratic_mean_diameter_SP1, quadratic_mean_diameter_SP2, quadratic_mean_diameter_SP3).

• mean_diameter_at_breast_height (MEAN_DBH) — decimal  •  cm  •  output: d_mean  •  multi-species: sp1, sp2, sp3

  Arithmetic mean diameter at breast height in the plot.

  Simulation breakdown: This variable is automatically expanded for each target stand species (mean_diameter_at_breast_height_SP1, mean_diameter_at_breast_height_SP2, mean_diameter_at_breast_height_SP3).

• Basal_area — decimal  •  m2/ha  •  output: G  •  multi-species: sp1, sp2, sp3

  Cross-sectional area of tree stems at breast height of all the trees within the plot.

  Accepted inventory aliases: g, g_ha, area_basimetrica, basal_area

  Simulation breakdown: This variable is automatically expanded for each target stand species (Basal_area_SP1, Basal_area_SP2, Basal_area_SP3).

• Species {num} basal area proportion (G_PROPORTION) — decimal  •  ratio  •  output: G_prop  •  multi-species: sp1, sp2, sp3

  Proportion of basal area of species {num} relative to total stand basal area.

  Accepted inventory aliases: g_prop, g_proportion, proporcion_g, {sp_lower}_g_prop, {sp_lower}_g_proportion, g_prop_{sp_lower}

  Simulation breakdown: This variable is automatically expanded for each target stand species (Species SP1 basal area proportion, Species SP2 basal area proportion, Species SP3 basal area proportion).

• Species {num} proportion (PROPORTION) — decimal  •  ratio  •  output: prop  •  multi-species: sp1, sp2

  Proportion of species {num} in mixed stands.

  Accepted inventory aliases: prop, proportion, proporcion, {sp_lower}_prop, {sp_lower}_proportion, prop_{sp_lower}

  Simulation breakdown: This variable is automatically expanded for each target stand species (Species SP1 proportion, Species SP2 proportion).

• Dominant_diameter (DOMINANT_DBH) — decimal  •  cm  •  output: Do  •  multi-species: sp1, sp2, sp3

  Dominant diameter, calculated as the mean diameter of the 100 thickest trees per hectare.

  Simulation breakdown: This variable is automatically expanded for each target stand species (Dominant_diameter_SP1, Dominant_diameter_SP2, Dominant_diameter_SP3).

• Dominant_section — decimal  •  cm  •  output: So  •  multi-species: sp1, sp2, sp3

  Mean cross-sectional area of dominant trees in the plot.

  Simulation breakdown: This variable is automatically expanded for each target stand species (Dominant_section_SP1, Dominant_section_SP2, Dominant_section_SP3).

• mean_height (MEAN_H) — decimal  •  m  •  output: h_mean  •  multi-species: sp1, sp2, sp3

  Arithmetic mean tree height in the plot.

  Simulation breakdown: This variable is automatically expanded for each target stand species (mean_height_SP1, mean_height_SP2, mean_height_SP3).

• Dominant_height (DOMINANT_H) — decimal  •  m  •  output: Ho  •  multi-species: sp1, sp2, sp3

  Dominant stand height (mean height of the 100 largest trees per hectare).

  Simulation breakdown: This variable is automatically expanded for each target stand species (Dominant_height_SP1, Dominant_height_SP2, Dominant_height_SP3).

• minimum_basal_area (BA_MIN) — decimal  •  cm2  •  output: g_min  •  multi-species: sp1, sp2, sp3

  Minimum individual tree basal area in the plot.

  Simulation breakdown: This variable is automatically expanded for each target stand species (minimum_basal_area_SP1, minimum_basal_area_SP2, minimum_basal_area_SP3).

• mean_basal_area (MEAN_BA) — decimal  •  cm2  •  output: g_mean  •  multi-species: sp1, sp2, sp3

  Mean individual tree basal area in the plot.

  Simulation breakdown: This variable is automatically expanded for each target stand species (mean_basal_area_SP1, mean_basal_area_SP2, mean_basal_area_SP3).

• maximum_basal_area (BA_MAX) — decimal  •  cm2  •  output: g_max  •  multi-species: sp1, sp2, sp3

  Maximum individual tree basal area in the plot.

  Simulation breakdown: This variable is automatically expanded for each target stand species (maximum_basal_area_SP1, maximum_basal_area_SP2, maximum_basal_area_SP3).

• minimum_diameter_at_breast_height (DBH_MIN) — decimal  •  cm  •  output: d_min  •  multi-species: sp1, sp2, sp3

  Minimum diameter at breast height in the plot.

  Simulation breakdown: This variable is automatically expanded for each target stand species (minimum_diameter_at_breast_height_SP1, minimum_diameter_at_breast_height_SP2, minimum_diameter_at_breast_height_SP3).

• maximum_diameter_at_breast_height (DBH_MAX) — decimal  •  cm  •  output: d_max  •  multi-species: sp1, sp2, sp3

  Maximum diameter at breast height in the plot.

  Simulation breakdown: This variable is automatically expanded for each target stand species (maximum_diameter_at_breast_height_SP1, maximum_diameter_at_breast_height_SP2, maximum_diameter_at_breast_height_SP3).

• minimum_height (H_MIN) — decimal  •  m  •  output: h_min  •  multi-species: sp1, sp2, sp3

  Minimum total tree height in the plot.

  Simulation breakdown: This variable is automatically expanded for each target stand species (minimum_height_SP1, minimum_height_SP2, minimum_height_SP3).

• maximum_height (H_MAX) — decimal  •  m  •  output: h_max  •  multi-species: sp1, sp2, sp3

  Maximum total tree height in the plot.

  Simulation breakdown: This variable is automatically expanded for each target stand species (maximum_height_SP1, maximum_height_SP2, maximum_height_SP3).

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Tree-level variables

• age — decimal  •  years  •  output: t

  Age of the individual tree.

  Accepted inventory aliases: tree_age, edad, t

• expansion_factor (expan) — decimal  •  dimensionless  •  output: expan

  Tree expansion factor. Represents the number of trees per hectare that a measured tree represents.

  Accepted inventory aliases: expan, factor_expansion, expansion_factor

• dbh_1 — decimal  •  cm  •  output: d_1

  First cross caliper measurement of diameter at breast height. Used to measure diameter at breast height in a cross shape.

• dbh_2 — decimal  •  cm  •  output: d_2

  Second perpendicular cross caliper measurement of diameter at breast height. Used to measure diameter at breast height in a cross shape.

• dbh_over_cork (dbh_oc) — decimal  •  cm  •  output: d_oc

  Diameter at breast height measured over the cork layer (Quercus suber).

• dbh — decimal  •  cm  •  output: d

  Diameter at breast height of the tree (measured at 1.30 meters).

  Accepted inventory aliases: d, diametro, diametro_normal, d_normal, diameter, dn

• bark_1 — decimal  •  mm  •  output: bark_1

  First measurement of bark thickness at breast height (1.30 m). Used to measure bark thickness in a cross shape.

• bark_2 — decimal  •  mm  •  output: bark_2

  Second measurement of bark thickness at breast height (1.30 m). Used to measure bark thickness in a cross shape.

• bark — decimal  •  mm  •  output: bark

  Mean tree bark thickness measured at 1.30 m.

• basal_area — decimal  •  cm2  •  output: g

  Cross-sectional trunk area at 1.30 m height.

• basal_area_intraspecific (basal_area_intrasp) — decimal  •  m2/ha  •  output: g_intrasp

  Basal area of trees of the same species as the subject tree, expressed as basal area per hectare.

• basal_area_interspecific (basal_area_intersp) — decimal  •  m2/ha  •  output: g_intersp

  Basal area of trees of other species than the subject tree, expressed as basal area per hectare.

• basal_area_per_hectare (ba_ha) — decimal  •  m2/ha  •  output: g_ha

  Subject tree basal area expressed per hectare (considering the tree expansion factor).

• normal_circumference — decimal  •  cm  •  output: c

  Normal trunk circumference measured at 1.30 m from ground level.

• stump_height (stump_h) — decimal  •  m  •  output: h_stump

  Stump height after tree felling.

• total_height (height) — decimal  •  m  •  output: h

  Total tree height from ground level to top apex.

  Accepted inventory aliases: h, altura, height

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