SPECIES

• Abies alba (20)
• Fagus sylvatica (12)
• Malus sylvestris (3)
• Picea abies (12)
• Pinus halepensis (11)
• Pinus pinaster (20)
• Pinus pinea (6)
• Pinus sylvestris (26)
• Populus nigra (24)
• Quercus robur (12)

Key: chr_AvBasalArea

Definition: The mean of the basal area per ha across all measured trees, whether living or dead

Description: The mean of the trunk cross-sectional area per hectar (10000 m2) of all living and dead trees measured at breast height (1.3 m). All tree species in the GCU confunded.

Type: _type_number

Range: -

SPECIES

• Abies alba (20)
• Fagus sylvatica (15)
• Malus sylvestris (3)
• Picea abies (12)
• Pinus halepensis (11)
• Pinus pinaster (24)
• Pinus pinea (6)
• Pinus sylvestris (28)
• Populus nigra (30)
• Quercus robur (12)

Key: chr_AvCircBreastHeight

Definition: Mean trunk circumference measured at breast height in a representative circular plot within the GCU (only for trees of circumference > 23.6 cm)

Description: The mean of the values of trunk circumference measured at breast height (1.3 m) for all individual trees measured in a circular plot of 15 m radius, representative for the entire GCU. Only trees with circumference > 23.6 cm (DBH > 7.5 cm) are measured.

Type: _type_number

Range: -

SPECIES

• Abies alba (20)
• Fagus sylvatica (15)
• Malus sylvestris (3)
• Picea abies (12)
• Pinus halepensis (11)
• Pinus pinaster (24)
• Pinus pinea (6)
• Pinus sylvestris (28)
• Populus nigra (30)
• Quercus robur (12)

Key: chr_AvCrownHeight

Definition: The mean of the vertical distance from ground level to the lowermost point on the main stem where the tree crown starts across all measured trees

Description: The mean of the values of height of the base of the tree crown across 10 individual adult dominant/co-dominant trees sampled either inside or in the vicinity of the circular plot with a radius of 15 m, which is representative of the GCU. The tree crown corresponds to the healthy and functional green crown envelope. Different criteria have to be taken into account: sanitary and continuity between the lower and upper branches. So that, the base of the tree crown could correspond to the first living branch or could start upper of the first living branch.

Type: _type_number

Range: -

SPECIES

• Abies alba (10)
• Fagus sylvatica (15)
• Malus sylvestris (3)
• Picea abies (12)
• Pinus halepensis (11)
• Pinus pinaster (11)
• Pinus pinea (6)
• Pinus sylvestris (14)
• Populus nigra (15)
• Quercus robur (12)

Key: chr_AvTreeAge

Definition: Mean age of the trees belonging to the target species

Description:

Type: _type_number

Range: -

SPECIES

• Abies alba (20)
• Fagus sylvatica (15)
• Malus sylvestris (3)
• Picea abies (12)
• Pinus halepensis (11)
• Pinus pinaster (24)
• Pinus pinea (6)
• Pinus sylvestris (28)
• Populus nigra (30)
• Quercus robur (12)

Key: chr_ForestComposition

Definition: Tree composition of the GCU assessed visually

Description: Composition of the forest stand assessed *by eye*: - `chr_ForestComposition_1`: single species - `chr_ForestComposition_1`: mixed forest

Type: _type_string_enum

SPECIES

• Abies alba (20)
• Fagus sylvatica (15)
• Malus sylvestris (3)
• Picea abies (12)
• Pinus halepensis (11)
• Pinus pinaster (24)
• Pinus pinea (6)
• Pinus sylvestris (28)
• Populus nigra (30)
• Quercus robur (12)

Key: chr_ForestStructure

Definition: Forest stand structure of the GCU assessed visually

Description: Forest stand structure assessed *by eye* at the GCU level: - `chr_ForestStructure_1`: tree crowns inside a single horizontal stratum - `chr_ForestStructure_2`: tree crowns contained inside multiple horizontal strata - `chr_ForestStructure_3`: stand composed of scattered tree crowns

Type: _type_string_enum

SPECIES

• Abies alba (10)
• Fagus sylvatica (15)
• Malus sylvestris (3)
• Picea abies (12)
• Pinus halepensis (11)
• Pinus pinaster (12)
• Pinus pinea (6)
• Pinus sylvestris (14)
• Populus nigra (15)
• Quercus robur (12)

Key: chr_IqrDieback

Definition: The InterQuartile Range of the dieback index across all measured trees

Description: The InterQuartile Range of the values of the dieback index across 10 measured adult dominant or co-dominant trees sampled either inside or in the vicinity of the representative circular plot with a radius of 15 m. The dieback index corresponds to the state of health of the trees determined by assessing foliage loss according to four classes: 0: 0 to 25% of defoliation 1: 25 to 50% of defoliation 2: 50 to 75 % of defoliation 3: 75% to 99% of defoliation The value 100% corresponds to a dead tree.

Type: _type_number

Range: -

SPECIES

• Abies alba (10)
• Fagus sylvatica (15)
• Malus sylvestris (3)
• Picea abies (12)
• Pinus halepensis (11)
• Pinus pinaster (12)
• Pinus pinea (6)
• Pinus sylvestris (14)
• Populus nigra (15)
• Quercus robur (12)

Key: chr_MedDeadTrees

Definition: Median of the presence of dead trees in the GCU

Description: Median of the presence of dead trees inside and around the circular plot with a radius of 15 m, which is representative of the GCU, where 0 means that there are no dead trees and 1 that there are dead trees for the target species.

Type: _type_number

Range: -

SPECIES

• Abies alba (10)
• Fagus sylvatica (15)
• Malus sylvestris (3)
• Picea abies (12)
• Pinus halepensis (11)
• Pinus pinaster (12)
• Pinus pinea (6)
• Pinus sylvestris (14)
• Populus nigra (15)
• Quercus robur (12)

Key: chr_MedDieback

Definition: The median of the dieback index across all measured trees

Description: The median of the values of the dieback index across 10 measured adult dominant or co-dominant trees sampled either inside or in the vicinity of the representative circular plot with a radius of 15 m. The dieback index corresponds to the state of health of the trees determined by assessing foliage loss according to four classes: 0: 0 to 25% of defoliation 1: 25 to 50% of defoliation 2: 50 to 75 % of defoliation 3: 75% to 99% of defoliation The value 100% corresponds to a dead tree.

Type: _type_number

Range: -

SPECIES

• Abies alba (10)
• Fagus sylvatica (15)
• Malus sylvestris (3)
• Picea abies (12)
• Pinus halepensis (11)
• Pinus pinaster (12)
• Pinus pinea (6)
• Pinus sylvestris (14)
• Populus nigra (15)
• Quercus robur (12)

Key: chr_MedNaturalRegeneration

Definition: Median of the abundance of natural regeneration for the target species of the GCU assessed around all measured trees

Description: Median of the abundance of natural regeneration assessed around 10 trees inside or around the circular plot with a radius of 15 m, which is representative of the GCU, where 0 means absence of natural regeneration, 1 means scattered regeneration, 2 regeneration in groups and 3 abundant regeneration.

Type: _type_number

Range: -

SPECIES

• Abies alba (20)
• Fagus sylvatica (15)
• Malus sylvestris (3)
• Picea abies (11)
• Pinus halepensis (11)
• Pinus pinaster (24)
• Pinus pinea (6)
• Pinus sylvestris (28)
• Populus nigra (30)
• Quercus robur (12)

Key: chr_PlotBasalArea

Definition: Total basal area of living or dead trees inside the representative circular plot, for all species in the plot

Description: The sum of the cross-sectional areas measured at breast height of all trees, all species combined, inside a circular plot of 15 m radius, which is representative of the GCU (for all individual trees with circumference > 23.6 cm). The plot is placed around the tree having the reading from the Bitterlisch relascope closest to the mean.

Type: _type_number

Range: -

SPECIES

• Abies alba (20)
• Fagus sylvatica (5)
• Malus sylvestris (3)
• Picea abies (11)
• Pinus halepensis (11)
• Pinus pinaster (4)
• Pinus pinea (6)
• Pinus sylvestris (8)
• Populus nigra (2)
• Quercus robur (12)

Key: chr_RootingDepth

Definition: The depth at which the deepest roots can be found

Description: Rooting depth is the depth beyond which there are no roots inside the auger or inside the pit. Rooting depth was generally measured by extracting soil samples down to 1 m depth from five cores taken with a soil auger inside the circular plot with a radius of 15 m, which is representative for the GCU. However, in situations when soil petrosity was very high and using the auger proved impossible, a pit was dug.

Type: _type_number_integer

Range: 100 - 0

SPECIES

• Abies alba (20)
• Fagus sylvatica (12)
• Malus sylvestris (3)
• Picea abies (12)
• Pinus halepensis (11)
• Pinus pinaster (20)
• Pinus pinea (6)
• Pinus sylvestris (26)
• Populus nigra (24)
• Quercus robur (12)

Key: chr_VarBasalArea

Definition: The variance of the basal area across all measured trees, whether living or dead

Description: Variance of the trunk cross-sectional area per hectar (10000 m2) of all living and dead trees measured at breast height (1.3 m). All tree species in the GCU confunded.

Type: _type_number

Range: -

SPECIES

• Abies alba (20)
• Fagus sylvatica (15)
• Malus sylvestris (3)
• Picea abies (12)
• Pinus halepensis (11)
• Pinus pinaster (24)
• Pinus pinea (6)
• Pinus sylvestris (28)
• Populus nigra (30)
• Quercus robur (12)

Key: chr_VarCircBreastHeight

Definition: Variance of the trunk circumference measured at breast height in a representative circular plot within the GCU (only for trees of circumference > 23.6 cm)

Description: The variance of the values of trunk circumference measured at breast height (1.3 m) for all individual trees measured in a circular plot of 15 m radius, representative for the entire GCU. Only trees with circumference > 23.6 cm (DBH > 7.5 cm) are measured.

Type: _type_number

Range: -

SPECIES

• Abies alba (20)
• Fagus sylvatica (15)
• Malus sylvestris (3)
• Picea abies (12)
• Pinus halepensis (11)
• Pinus pinaster (24)
• Pinus pinea (6)
• Pinus sylvestris (28)
• Populus nigra (30)
• Quercus robur (12)

Key: chr_VarCrownHeight

Definition: The variance of the vertical distance from ground level to the lowermost point on the main stem where the tree crown starts across all measured trees

Description: The variance of the values of height of the base of the tree crown across 10 individual adult dominant/co-dominant trees sampled either inside or in the vicinity of the circular plot with a radius of 15 m, which is representative of the GCU. The tree crown corresponds to the healthy and functional green crown envelope. Different criteria have to be taken into account: sanitary and continuity between the lower and upper branches. So that, the base of the tree crown could correspond to the first living branch or could start upper of the first living branch.

Type: _type_number

Range: -

SPECIES

• Abies alba (20)
• Fagus sylvatica (15)
• Malus sylvestris (3)
• Picea abies (12)
• Pinus halepensis (11)
• Pinus pinaster (24)
• Pinus pinea (6)
• Pinus sylvestris (28)
• Populus nigra (30)
• Quercus robur (12)

Key: chr_VarHtot

Definition: The variance of the vertical tree height across all measured trees

Description: Variance of the values of tree height for 10 measured adult dominant or co-dominant trees sampled either inside or in the vicinity of the representative circular plot with a radius of 15 m. The tree height corresponds to the total vertical tree height from ground level to the upmost tip.

Type: _type_number

Range: -