https://data.botanik.uni-halle.de/bef-china/datasets/398
Main Experiment: Tree inventory Main experiment Site A 2010
Goddert
von Oheimb
Goddert_v_Oheimb@tu-dresden.de
Werner
Härdtle
haerdtle@uni-lueneburg.de
Ying
Li
Beijing Forestry University
Beijing
China
yingli8441@hotmail.com
2013-09-24
en_US
This data documents the tree growth parameters in 2010 for site A, belonging to the annual inventory taking place for both site A and site B. Individual-tree growth is a function of stand attributes, local neighbors, plant size, plant damage, genotype, and local abiotic site conditions. Given a certain time phase (combing further data along the timeline), the following scientific questions will be investigated: a) How does the within-plot individual-tree growth vary within and among species as a function of species richness? b) Wheather diversity reduces competition by quantifying local neighbour interactions in terms of growth rates and branch demography? c) What are the ecological importance of phenotypic plasticity of tree individuals in relation to competition, species richenss, and local terrain conditions? d) How the individual-tree growth is affected by soil feed-backs (mycorrhiza, pedogenetic processes,soil chemistry and nutrient cycle)? The overall objective with the data to be achieved is to test the hypothesis that the diversity effect at the plot level is the overall result of the diversity effects at the local neighbourhood level. This data as a basis can also be linked to other abiotic and biotic factors for investigating the interactions between the tree growth performance and abiotic and biotic factors. Measurement for this data took place in October 2010. Measurements were conducted in the central part (extended core area) of all 1mu-plots in site A. Extended core area is the central 6 * 6 trees in the monoculture and 2-species mixtures ( total 36 tree positions per 1mu-plot), the central 12 * 12 trees in the 4-,8-,16-,24-species mixtures (total 144 tree positions per 1 mu-plot). By applying the conventional measuring methods direct in the field, tree position, tree species, total height, stem diameter 5 cm above ground height (gd), the diameter at breast height (dbh), the distance up to the first branch, the distance up to the longest branch, the diameter, the length, the azimuth and the angle of the longest branch, the crown diameters (N-S and E-W) were measured and the number of branches were counted.
The measurements were conducted after the weeding in autumn and before the deciduous trees leaved off. Choosing this season is because a) weeded plots shorten the time consumed for identifying the tree positions; b) during this period, trees reach their highest height for this growing season (Pilot Experiment approved, unpublished data); c) Leaf-on gives a more accurate estimation on crown diameter.
basal diameter
bifurcation point
branch
crown architecture
date
dbh
height
location
Main Experiment
object
response variable
Site A
species
tree individual
Find the list of keywords here: https://data.botanik.uni-halle.de/bef-china/keywords
TAG
PLOT_NO
page
date
spp.code2010
spp.code.n2010
spp2010
height2010
gd2010
dbh2010
dlong2010
llong2010
nbranch2010
hlong2010
h1st2010
anlong2010
azlong2010
ns.crown2010
ew.crown2010
comments
dbh.comments
List of headers of the data columns in this dataset
https://data.botanik.uni-halle.de/bef-china/datasets/398/download.csv?separate_category_columns=true
This data was collected from site A within the BEF-China experiment, which is located in a hilly subtropical region near Xingangshan Township, Jiangxi Province (29.08-29.11 N, 117.90- 117.93 E), China. The mean annual temperature is 16.7 celsius degrees and the mean annual average precipitation 1821 mm. The natural vegetation of this region is subtropical broad-leaved forest with dominance in abundance of evergreen species (Bruelheide et al. 2011). Site A was planted in 2009 and covers a total area of 26.6 ha, ranging in altitude from 105 to 275 m. The relief is highly variable with slopes ranging from 0 to 45 degrees. The soils are Cambisols and Cambisol derivatives, interfered by Regosols on ridges and crests, and Anthrosols from colluvial deposits on foot slopes and valley floors. Due to the mountainous topography, erosion is a typical feature resulting a mixing of parent material and soil components from crest to valley positions.
117.89978
118.148346
29.285201
29.101777
2010-10-14
2010-10-26
Castanea henryi
Pinus massoniana
Schima superba
Choerospondia axillaris
Liquidambar formosana
Quercus serrata
Cyclobalanopsis myrsinifolia
Castanopsis carlesii
Cyclobalanopsis glauca
Lithocarpus glaber
Castanopsis eyrei
Castanopsis sclerophylla
Diospyros japonica
Daphniphyllus oldhamii
Cinnamomum camphora
Koelreuteria bipinnata
Sapindus mukorossi
Nyssa sinensis
Triadica sebifera
Triadica cochinchinensis
Rhus chinensis
Quercus fabri
Quercus acutissima
Melia azedarach
Acer davidii
Cunninghamia lanceolata
Castanopsis fargesii
Castanea henryi
Pinus massoniana
Schima superba
Choerospondia axillaris
Liquidambar formosana
Quercus serrata
Cyclobalanopsis myrsinifolia
Castanopsis carlesii
Cyclobalanopsis glauca
Lithocarpus glaber
Castanopsis eyrei
Castanopsis sclerophylla
Diospyros japonica
Daphniphyllus oldhamii
Cinnamomum camphora
Koelreuteria bipinnata
Sapindus mukorossi
Nyssa sinensis
Triadica sebifera
Triadica cochinchinensis
Rhus chinensis
Quercus fabri
Quercus acutissima
Melia azedarach
Acer davidii
Cunninghamia lanceolata
Castanopsis fargesii
gvonoheimb
whaerdtle
yli
Main Experiment: Tree inventory Main experiment Site A 2010
This data documents the tree growth parameters in 2010 for site A, belonging to the annual inventory taking place for both site A and site B. Individual-tree growth is a function of stand attributes, local neighbors, plant size, plant damage, genotype, and local abiotic site conditions. Given a certain time phase (combing further data along the timeline), the following scientific questions will be investigated: a) How does the within-plot individual-tree growth vary within and among species as a function of species richness? b) Wheather diversity reduces competition by quantifying local neighbour interactions in terms of growth rates and branch demography? c) What are the ecological importance of phenotypic plasticity of tree individuals in relation to competition, species richenss, and local terrain conditions? d) How the individual-tree growth is affected by soil feed-backs (mycorrhiza, pedogenetic processes,soil chemistry and nutrient cycle)? The overall objective with the data to be achieved is to test the hypothesis that the diversity effect at the plot level is the overall result of the diversity effects at the local neighbourhood level. This data as a basis can also be linked to other abiotic and biotic factors for investigating the interactions between the tree growth performance and abiotic and biotic factors. Measurement for this data took place in October 2010. Measurements were conducted in the central part (extended core area) of all 1mu-plots in site A. Extended core area is the central 6 * 6 trees in the monoculture and 2-species mixtures ( total 36 tree positions per 1mu-plot), the central 12 * 12 trees in the 4-,8-,16-,24-species mixtures (total 144 tree positions per 1 mu-plot). By applying the conventional measuring methods direct in the field, tree position, tree species, total height, stem diameter 5 cm above ground height (gd), the diameter at breast height (dbh), the distance up to the first branch, the distance up to the longest branch, the diameter, the length, the azimuth and the angle of the longest branch, the crown diameters (N-S and E-W) were measured and the number of branches were counted.
2010-10-14 00:00:00 UTC - 2010-10-26 00:00:00 UTC
This data was collected from site A within the BEF-China experiment, which is located in a hilly subtropical region near Xingangshan Township, Jiangxi Province (29.08-29.11 N, 117.90- 117.93 E), China. The mean annual temperature is 16.7 celsius degrees and the mean annual average precipitation 1821 mm. The natural vegetation of this region is subtropical broad-leaved forest with dominance in abundance of evergreen species (Bruelheide et al. 2011). Site A was planted in 2009 and covers a total area of 26.6 ha, ranging in altitude from 105 to 275 m. The relief is highly variable with slopes ranging from 0 to 45 degrees. The soils are Cambisols and Cambisol derivatives, interfered by Regosols on ridges and crests, and Anthrosols from colluvial deposits on foot slopes and valley floors. Due to the mountainous topography, erosion is a typical feature resulting a mixing of parent material and soil components from crest to valley positions.
Castanea henryi
Pinus massoniana
Schima superba
Choerospondia axillaris
Liquidambar formosana
Quercus serrata
Cyclobalanopsis myrsinifolia
Castanopsis carlesii
Cyclobalanopsis glauca
Lithocarpus glaber
Castanopsis eyrei
Castanopsis sclerophylla
Diospyros japonica
Daphniphyllus oldhamii
Cinnamomum camphora
Koelreuteria bipinnata
Sapindus mukorossi
Nyssa sinensis
Triadica sebifera
Triadica cochinchinensis
Rhus chinensis
Quercus fabri
Quercus acutissima
Melia azedarach
Acer davidii
Cunninghamia lanceolata
Castanopsis fargesii
The tree positions in the so called extended core area for each 1mu-plot were surveyed. The extended core area is the central 6 * 6 tree positions in the monocultres and 2-species mixtures (36 tree positions per 1mu-plot) and the central 12 * 12 tree positions in the 4-, 8-, 16- or 24- species mixtures (144 tree positions per 1mu-plot).
https://data.botanik.uni-halle.de/bef-china/datasets/398
Main Experiment: Tree inventory Main experiment Site A 2010
/bef-china/datasets/398
ASCII
1
column
,
https://data.botanik.uni-halle.de/bef-china/datasets/398/download.csv?separate_category_columns=true
t or s TAG Main Experiment (TAG),
TAG
t-Tag/ s-Tag indicating individual tree position in the Main Experiment
code for planting locations, 12 digits with "t" (tree) in front or "s" (shrub); Datagroup description: Tree or shrub tags consist of 12 digits: The first 6 are the site plot name: _1_ site _2/3_ row, counting from North _4/5_ column, counting from west _6_ is the plot moved? Is it a quarter plot? The next 6 digits describe the tree individual _7/8_ type of individual (01 planned tree, 02 other tree than planted but in a given plot somewhere, 03 planned shrub, 04 other shrub within this plot) _9/10_ x grid position within plot, starting from southwest northwards _11/12 y grid position, starting from southwest eastwards. (TAG: code for planting locations, 12 digits with "t" in front; Datagroup description: Tree or shrub tags consist of 12 digits: The first 6 are the site plot name: _1_ site _2/3_ row, counting from North _4/5_ column, counting from west _6_ is the plot moved? Is it a quarter plot? The next 6 digits describe the tree individual _7/8_ type of individual (01 planned tree, 02 other tree than planted but in a given plot somewhere, 03 planned shrub, 04 other shrub within this plot) _9/10_ x grid position within plot, starting from southwest northwards _11/12 y grid position, starting from southwest eastwards.)
t-Tag/ s-Tag indicating individual tree position in the Main Experiment
code for planting locations, 12 digits with "t" (tree) in front or "s" (shrub); Datagroup description: Tree or shrub tags consist of 12 digits: The first 6 are the site plot name: _1_ site _2/3_ row, counting from North _4/5_ column, counting from west _6_ is the plot moved? Is it a quarter plot? The next 6 digits describe the tree individual _7/8_ type of individual (01 planned tree, 02 other tree than planted but in a given plot somewhere, 03 planned shrub, 04 other shrub within this plot) _9/10_ x grid position within plot, starting from southwest northwards _11/12 y grid position, starting from southwest eastwards.
t or s TAG Main Experiment
t-Tag/ s-Tag indicating individual tree position in the Main Experiment
code for planting locations, 12 digits with "t" (tree) in front or "s" (shrub); Datagroup description: Tree or shrub tags consist of 12 digits: The first 6 are the site plot name: _1_ site _2/3_ row, counting from North _4/5_ column, counting from west _6_ is the plot moved? Is it a quarter plot? The next 6 digits describe the tree individual _7/8_ type of individual (01 planned tree, 02 other tree than planted but in a given plot somewhere, 03 planned shrub, 04 other shrub within this plot) _9/10_ x grid position within plot, starting from southwest northwards _11/12 y grid position, starting from southwest eastwards.
code for planting locations, 12 digits with "t" in front; Datagroup description: Tree or shrub tags consist of 12 digits: The first 6 are the site plot name: _1_ site _2/3_ row, counting from North _4/5_ column, counting from west _6_ is the plot moved? Is it a quarter plot? The next 6 digits describe the tree individual _7/8_ type of individual (01 planned tree, 02 other tree than planted but in a given plot somewhere, 03 planned shrub, 04 other shrub within this plot) _9/10_ x grid position within plot, starting from southwest northwards _11/12 y grid position, starting from southwest eastwards.
Plot name Main experiment (letter, number code) (PLOT_NO), dimensionless
PLOT_NO
Plot number according to design spreadsheet. Plots are named according to their location on the original spreadsheet used for treatment design. This has letters from West to East and numbers from North to south. Some plots were moved half a gridcell (1 mu) so be suitable for planting (grid cell loctype). Example: B32 (PLOT_NO: plot)
Plot number according to design spreadsheet. Plots are named according to their location on the original spreadsheet used for treatment design. This has letters from West to East and numbers from North to south. Some plots were moved half a gridcell (1 mu) so be suitable for planting (grid cell loctype). Example: B32
Plot name Main experiment (letter, number code)
Plot number according to design spreadsheet. Plots are named according to their location on the original spreadsheet used for treatment design. This has letters from West to East and numbers from North to south. Some plots were moved half a gridcell (1 mu) so be suitable for planting (grid cell loctype). Example: B32
plot
Helper (page), dimensionless
page
Helper column to understand other columns in this data set (page: page)
Helper column to understand other columns in this data set
Helper
Helper column to understand other columns in this data set
page
Date time information (date), dimensionless
date
Date time information, given as year or as date or as date time. (date: the survey date)
Date time information, given as year or as date or as date time.
Date time information
Date time information, given as year or as date or as date time.
the survey date
Helper (spp.code2010),
spp.code2010
Helper column to understand other columns in this data set (spp.code2010: the species code recorded on the field)
Helper column to understand other columns in this data set
Helper
Helper column to understand other columns in this data set
the species code recorded on the field
Helper (spp.code.n2010),
spp.code.n2010
Helper column to understand other columns in this data set (spp.code.n2010: the species code surveyed in 2010)
Helper column to understand other columns in this data set
Helper
Helper column to understand other columns in this data set
the species code surveyed in 2010
Scientific plant species name (spp2010),
spp2010
The scientific species fullnames are based on the "Flora of China" identified by Teng Fang and verified by Helge Bruelheide (trees) and Alexandra Erfmeier (herbs). Scientific species names consist of epithet and genus. For identification, the Author name and the year of the publications of the description are required. (spp2010: the species name surveyed in 2010)
The scientific species fullnames are based on the "Flora of China" identified by Teng Fang and verified by Helge Bruelheide (trees) and Alexandra Erfmeier (herbs). Scientific species names consist of epithet and genus. For identification, the Author name and the year of the publications of the description are required.
Scientific plant species name
The scientific species fullnames are based on the "Flora of China" identified by Teng Fang and verified by Helge Bruelheide (trees) and Alexandra Erfmeier (herbs). Scientific species names consist of epithet and genus. For identification, the Author name and the year of the publications of the description are required.
the species name surveyed in 2010
Plant height (height2010), centimeter
height2010
measuring tree height (height2010: the total tree height; Datagroup description: Total height was measured as the length from stem base to the apical meristem.; Instrumentation: linear tape)
dimensionless
real
Plant height
measuring tree height
the total tree height; Datagroup description: Total height was measured as the length from stem base to the apical meristem.; Instrumentation: linear tape
linear tape
Basal diameter (gd2010), centimeter
gd2010
Basal diameter was measured 5 - 10 cm above ground (gd2010: the stem ground diameter ( 5 cm aboveground ); Datagroup description: Stem diameter at 5 cm above ground was measured; Instrumentation: caliper)
dimensionless
real
Basal diameter
Basal diameter was measured 5 - 10 cm above ground
the stem ground diameter ( 5 cm aboveground ); Datagroup description: Stem diameter at 5 cm above ground was measured; Instrumentation: caliper
caliper
Diameter at breast height (dbh2010), centimeter
dbh2010
Diameter of a tree, measured at 1.3 m height (dbh2010: the diameter at breast height ( 130 cm aboveground ); Instrumentation: caliper)
dimensionless
real
Diameter at breast height
Diameter of a tree, measured at 1.3 m height
the diameter at breast height ( 130 cm aboveground ); Instrumentation: caliper
caliper
Branch demography (dlong2010), centimeter
dlong2010
Branch demography is described by parameters such as height and length of the longest branch (with a linear tape), its diameter (at a distance of 1 cm from the stem with a calliper), its elevation angle (measured from the horizontal with an angle finder), and azimuth (with a compass; Pearcy & Yang 1996); total number of branches > 1 cm. (dlong2010: the diameter for the longest branch ( 1cm from stem ); Datagroup description: The analysis of branch demography is by means of: height and length of the longest branch (with a linear tape), ist diameter (at a distance of 1 cm from the stem with a caliper) elevation angle (measured from the horizontal with an angle finder), and azimuth (with a compass; Pearcy & Yang 1996); total number of branches > 1 cm.; Instrumentation: caliper)
dimensionless
real
Branch demography
Branch demography is described by parameters such as height and length of the longest branch (with a linear tape), its diameter (at a distance of 1 cm from the stem with a calliper), its elevation angle (measured from the horizontal with an angle finder), and azimuth (with a compass; Pearcy & Yang 1996); total number of branches > 1 cm.
the diameter for the longest branch ( 1cm from stem ); Datagroup description: The analysis of branch demography is by means of: height and length of the longest branch (with a linear tape), ist diameter (at a distance of 1 cm from the stem with a caliper) elevation angle (measured from the horizontal with an angle finder), and azimuth (with a compass; Pearcy & Yang 1996); total number of branches > 1 cm.; Instrumentation: caliper
caliper
Branch demography (llong2010), centimeter
llong2010
Branch demography is described by parameters such as height and length of the longest branch (with a linear tape), its diameter (at a distance of 1 cm from the stem with a calliper), its elevation angle (measured from the horizontal with an angle finder), and azimuth (with a compass; Pearcy & Yang 1996); total number of branches > 1 cm. (llong2010: the length of the longest branch; Instrumentation: linear tape)
dimensionless
real
Branch demography
Branch demography is described by parameters such as height and length of the longest branch (with a linear tape), its diameter (at a distance of 1 cm from the stem with a calliper), its elevation angle (measured from the horizontal with an angle finder), and azimuth (with a compass; Pearcy & Yang 1996); total number of branches > 1 cm.
the length of the longest branch; Instrumentation: linear tape
linear tape
Branch demography (nbranch2010), dimensionless
nbranch2010
Branch demography is described by parameters such as height and length of the longest branch (with a linear tape), its diameter (at a distance of 1 cm from the stem with a calliper), its elevation angle (measured from the horizontal with an angle finder), and azimuth (with a compass; Pearcy & Yang 1996); total number of branches > 1 cm. (nbranch2010: the number of branches (taking account of branches longer than 1 cm))
dimensionless
real
Branch demography
Branch demography is described by parameters such as height and length of the longest branch (with a linear tape), its diameter (at a distance of 1 cm from the stem with a calliper), its elevation angle (measured from the horizontal with an angle finder), and azimuth (with a compass; Pearcy & Yang 1996); total number of branches > 1 cm.
the number of branches (taking account of branches longer than 1 cm)
calliper
Branch demography (hlong2010), centimeter
hlong2010
Branch demography is described by parameters such as height and length of the longest branch (with a linear tape), its diameter (at a distance of 1 cm from the stem with a calliper), its elevation angle (measured from the horizontal with an angle finder), and azimuth (with a compass; Pearcy & Yang 1996); total number of branches > 1 cm. (hlong2010: the distance up to the longest branch; Instrumentation: linear tape)
dimensionless
real
Branch demography
Branch demography is described by parameters such as height and length of the longest branch (with a linear tape), its diameter (at a distance of 1 cm from the stem with a calliper), its elevation angle (measured from the horizontal with an angle finder), and azimuth (with a compass; Pearcy & Yang 1996); total number of branches > 1 cm.
the distance up to the longest branch; Instrumentation: linear tape
linear tape
Bifurcation point (h1st2010), centimeter
h1st2010
Height of the first living branch (h1st2010: the distance up to the first living branch, for branchless trees, the distance up to the first living leaf was recorded; Instrumentation: linear tape)
dimensionless
real
Bifurcation point
Height of the first living branch
the distance up to the first living branch, for branchless trees, the distance up to the first living leaf was recorded; Instrumentation: linear tape
linear tape
Branch demography (anlong2010), degree
anlong2010
Branch demography is described by parameters such as height and length of the longest branch (with a linear tape), its diameter (at a distance of 1 cm from the stem with a calliper), its elevation angle (measured from the horizontal with an angle finder), and azimuth (with a compass; Pearcy & Yang 1996); total number of branches > 1 cm. (anlong2010: the elevation angle of the longest branch; Instrumentation: angle finder)
dimensionless
real
Branch demography
Branch demography is described by parameters such as height and length of the longest branch (with a linear tape), its diameter (at a distance of 1 cm from the stem with a calliper), its elevation angle (measured from the horizontal with an angle finder), and azimuth (with a compass; Pearcy & Yang 1996); total number of branches > 1 cm.
the elevation angle of the longest branch; Instrumentation: angle finder
angle finder
Branch demography (azlong2010), degree
azlong2010
Branch demography is described by parameters such as height and length of the longest branch (with a linear tape), its diameter (at a distance of 1 cm from the stem with a calliper), its elevation angle (measured from the horizontal with an angle finder), and azimuth (with a compass; Pearcy & Yang 1996); total number of branches > 1 cm. (azlong2010: the azimuth of the longest branch; Instrumentation: compass)
dimensionless
real
Branch demography
Branch demography is described by parameters such as height and length of the longest branch (with a linear tape), its diameter (at a distance of 1 cm from the stem with a calliper), its elevation angle (measured from the horizontal with an angle finder), and azimuth (with a compass; Pearcy & Yang 1996); total number of branches > 1 cm.
the azimuth of the longest branch; Instrumentation: compass
compass
Crown architecture (ns.crown2010), centimeter
ns.crown2010
Crown radii in the eight subcardinal directions were determined by means of a crown mirror. Columns comprise the horizontal distance (hdist) and the distance taking into account the slope (dist). The crown projection area was calculated using the formula for a polygon. In cases of extraordinary crown displacement – the crown projection did not include the stem base – the distances to the proximal and distal edge of the crown were measured in all possible directions (if this was only possible for one direction, four crown radii were measured as follows: the distances to the proximal and distal edge of the crown were determined and, starting at the centre of this crown diameter, on the axis perpendicular to it. In this case, crown area was approximated as a quadrangle). Absolute crown displacement (ad) was considered to be the distance of the centre of gravity of the crown area from the stem base. Relative crown displacement (rd) was considered to be ad divided by the mean crown radius (Longuetaud et al., 2008). In cases where the centre of gravity perfectly matches the stem base, rd is equal to 0. --- Crown length is calculated as the total tree height minus the height of the bifurcation point, The crown ratio was calculated as crown length divided by the total height of the tree (ns.crown2010: the crown diameter along N-S cardinal direction)
dimensionless
real
Crown architecture
Crown radii in the eight subcardinal directions were determined by means of a crown mirror. Columns comprise the horizontal distance (hdist) and the distance taking into account the slope (dist). The crown projection area was calculated using the formula for a polygon. In cases of extraordinary crown displacement – the crown projection did not include the stem base – the distances to the proximal and distal edge of the crown were measured in all possible directions (if this was only possible for one direction, four crown radii were measured as follows: the distances to the proximal and distal edge of the crown were determined and, starting at the centre of this crown diameter, on the axis perpendicular to it. In this case, crown area was approximated as a quadrangle). Absolute crown displacement (ad) was considered to be the distance of the centre of gravity of the crown area from the stem base. Relative crown displacement (rd) was considered to be ad divided by the mean crown radius (Longuetaud et al., 2008). In cases where the centre of gravity perfectly matches the stem base, rd is equal to 0. --- Crown length is calculated as the total tree height minus the height of the bifurcation point, The crown ratio was calculated as crown length divided by the total height of the tree
the crown diameter along N-S cardinal direction
linear tape
Crown architecture (ew.crown2010), centimeter
ew.crown2010
Crown radii in the eight subcardinal directions were determined by means of a crown mirror. Columns comprise the horizontal distance (hdist) and the distance taking into account the slope (dist). The crown projection area was calculated using the formula for a polygon. In cases of extraordinary crown displacement – the crown projection did not include the stem base – the distances to the proximal and distal edge of the crown were measured in all possible directions (if this was only possible for one direction, four crown radii were measured as follows: the distances to the proximal and distal edge of the crown were determined and, starting at the centre of this crown diameter, on the axis perpendicular to it. In this case, crown area was approximated as a quadrangle). Absolute crown displacement (ad) was considered to be the distance of the centre of gravity of the crown area from the stem base. Relative crown displacement (rd) was considered to be ad divided by the mean crown radius (Longuetaud et al., 2008). In cases where the centre of gravity perfectly matches the stem base, rd is equal to 0. --- Crown length is calculated as the total tree height minus the height of the bifurcation point, The crown ratio was calculated as crown length divided by the total height of the tree (ew.crown2010: the crown diameter along E-W cardinal direction)
dimensionless
real
Crown architecture
Crown radii in the eight subcardinal directions were determined by means of a crown mirror. Columns comprise the horizontal distance (hdist) and the distance taking into account the slope (dist). The crown projection area was calculated using the formula for a polygon. In cases of extraordinary crown displacement – the crown projection did not include the stem base – the distances to the proximal and distal edge of the crown were measured in all possible directions (if this was only possible for one direction, four crown radii were measured as follows: the distances to the proximal and distal edge of the crown were determined and, starting at the centre of this crown diameter, on the axis perpendicular to it. In this case, crown area was approximated as a quadrangle). Absolute crown displacement (ad) was considered to be the distance of the centre of gravity of the crown area from the stem base. Relative crown displacement (rd) was considered to be ad divided by the mean crown radius (Longuetaud et al., 2008). In cases where the centre of gravity perfectly matches the stem base, rd is equal to 0. --- Crown length is calculated as the total tree height minus the height of the bifurcation point, The crown ratio was calculated as crown length divided by the total height of the tree
the crown diameter along E-W cardinal direction
linear tape
yes
18930