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Title:
CSPs: Tree neighbour competitive traits in the comparative study plots - tree individuals
Access rights:
Free for members
Usage rights:
No information available
Published:
Lang et al. 2010, FORECO 260, 1708-1715; http://dx.doi.org/10.1016/j.foreco.2010.08.015
Abstract:
This research is done to quantifiy individual tree growth and mortality within and among different species in the comparative study plots. Local neighbourhood interactions are analysed by the means of competition indices. Questions are: (a) does diversity reduce competition? (b) does competition change with successional stage? The data might provide valuable information to be compared with data from the main experiment. We chose 20 target trees each of the two most abundant evergreen species (Castanopsis eyrei FAGACEAE and Schima superba THEACEAE ) and of the two most abundant decidious species (Quercus serrata and Castanea henryi FAGACEAE). Competitors were defined as all trees with a dbh> 10 cm in middle and old successional forests and >3 cm in early successional forests and within a radius that is 1/2 of the height of the target tree. The positions of the competitors in relation to the respective target tree were evaluated (distance and azimuth). Following parameters were measured of all trees: total height, heigth of bifurcatin point, dbh and the crown width in 8 directions.
Design:
Selection of target species: the two most abundant evergreen and decidious species were selected. Selection of target trees: prerequisites for target trees: (a) the crown is part of the upper most canopy layer (b) the tree is single stemmed (c) the crown does not suffer a crown loss of more than 30% of the original crown caused by snow break (2008) (d) there are no completely broken trees in the closest neighbourhood (we assume that the effect of open space would influence the growth of the target tree more than the competitors) (e) the tree's position is within the CSP or in the nearby (not more than 30m away, and only in comparable environment (slope direction, species composition)) If there were several potential target trees they were chosen randomly. Selection of competitors: all neighbours within a radius of 1/2 the height of the target tree were said to be competitors. Additionally, the dbh limit was >10cm in middle and late successional and >3cm in early successional plots. Measurements:(a) Position: the position of the target tree is noted in relation to one corner of the CSP (distance and angle). The positions of the competitors in relation to the middle of the stemfoot of the target tree are assessed (distance and angle) (b) total height was measured by the means of a Vertex Forester hypsometer in cases this was not yet done by SP1 (c) diameter at breast heigth (dbh) was measured by the means of a diameter tape (dbh>10cm) and with a callipper (dbh<10cm) in the direction of the slope and perpendicular to it. In the case of multistemmed trees the average of all stems was calculated. (d) height of bifurcation point was measured by the means of a Vertex Forester hypsometer. The bifurcation point was measured at the lowest real branch with leaves. If the crown was broken it was determined to be at the first branch (including more than one year old Wasserreißer) that was of importance for the crown. In the case that the whole crown was broken the height where the Wasserreißer got very dense creating a secondary crown was measured. (e) crown width Each crown was measured in eight directions (N, NE, E, SE, S, SW,W,NW). The widest extension of the respective direction (as the distance from the middle of the stem foot to the last leaf) was determined by the means of a crown mirror and measured with the Vertex Forester hypsometer. In the case that there was only a one direction measurement, the distance to the crown starting (first leaf) was taken additionally, the middle of the crown claculated and from that point the crown extension in the two perpendicular directions was measured (one point measurement). If there could not be measured any leaf in any of the directions a one point measurement in the direction of the overall widest crown extension was made. The direction was noted (angle in gon). Additional parameters: (a) % coverage:estimation of how much percent of the projected crown area (surroundes by the measured points) are covered by leaves and branches (I-V, in 20% steps) (b) % crown loss: estimation of the percentage of crown loss of the original crown volume because of breaking induced by the heavy snow load in February 2008 (1-4 in 25% steps, 5 complete crownloss)
Spatial extent:
CSPs 29°08'-29°17'N 118°02'-118°11'E Measurements and calculated variables Crown radii in the eight subcardinal directions were determined by means of a crown mirror. The crown projection area (hereafter crown 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). Relative crown displacement (rd) was considered to be the distance of the centre of gravity of the crown area from the stem base, 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. Main tree stems may deviate from vertical stature in two different ways: stem inclination and stem bendiness, with the former involving straight but leaning stems and the latter bent or curved stems (Schamp et al., 2007). In the forest interior of Gutianshan NNR bent growth forms are confined to a relatively small number of trees. To obtain the degree of stem inclination, we first measured the height of the bifurcation point (height at which the lowest living crown branch of the tree branches off, excluding epicormics or springs), and then the horizontal distance of the bifurcation point from the stem in the direction of the slope. The angle of inclination was calculated as tan alpha of these two distances. If the stem was inclined towards the slope, stem inclination was considered to be negative. This method is similar to that used by Matsuzaki et al. (2006), where stem inclination was defined by referring to a straight line between the stem base and the top of the tree. However, in our study we used the bifurcation point as a reference point in order to separate the effect of crown asymmetry from that of stem inclination.The dbh (measured with a diameter measurement tape) and total height were recorded for all trees. The relative position of the neighbours to the target tree was measured as the horizontal distance from stem base to stem base. All height and distance measurements were conducted using a Forester Vertex Hypsometer (Haglöf, Sweden). All neighbours were determined to species. Local species richness (i.e. the species richness of the group) was estimated using the rarefaction method (Hurlbert’s formula, 1971) of the vegan package in R (subsample size: two trees). We applied the same method to obtain ameasure for local functional diversity. For this purpose we classified the species into seven functional groups. Since our hypotheses are based on growth characteristics of crown and stem, the trees were allocated to the functional groups according to adult tree height (canopy tree vs. sub-canopy tree) (Poorter et al., 2006), leaf longevity (evergreen vs. deciduous) (Deng et al., 2008) and leaf morphology (simple leaves, compound leaves, needles). We decided to establish an additional functional group for Fabaceae, because of their well known ability to fix nitrogen and the resulting differential preconditions for growth.To characterise the competitive power of the target trees competition indices have been calculated. Upper canopy heightwasdefined as themeanheight of the highest 20% trees in the respective group.For each tree group, data for slope inclination and aspect were collected and transformed after Beers et al. (1966).
Temporal extent:
No information available
Taxonomic extent:
Tree species in the Comparative study plots
Measurement cirumstances:
There were different periods, in wich data was measured. This might cause differences in the crown measurements. In December some of the decidious had no leaves any more. If so the tip of the longest twigg was measured (if possible to see). It causes some problems to look through a crown of a competitor with a cover of V. The great steepness caused some problems to the crown measurements since it was sometimes very diffcult to walk in the explicit direction. Also the trees were growing in such strange angles that the crown could only be measures with "one point" measurements which causes some problems to the comparability of the data.
Data analysis:
We tested speciesspecific differences of crown area, relative crown displacement and stem inclination using a mixed effects model with species as fixed effect and plot as random effect. We refined our models by testing for main effects of abiotic and biotic environmental variables in order to verify their effects on crown and stem parameters. Biotic variables included species richness, functional diversity, competition index, the dbh of the target tree and mean upper canopy height, while the abiotic variables were slope inclination, slope aspect and soil depth. Target species identity was also included as a categorical predictor variable. Similar to the previous models, plot was included as random effect.

Filter:
Dataset column

Name:
CSP
Definition:
name of the CSP in the Nature ReserveBEF research plot nameReasearch plots of the Biodiversity - Ecosystem functioning experiment (BEF-China). There are three main sites for research plots in the BEF Experiment: Comparative Study Plots (CSP) in the Gutianshan Nature Reserve, having a size of 30x30m^2, measured on the ground.
Unit:
No information available
Datagroup:
BEF research plot name
Keywords:
CSP, location
Values:
CSP02
CSP04
CSP01
CSP03
CSP05
Contributors:
No information available

Dataset column

Name:
date
Definition:
date of fieldwork
Unit:
No information available
Datagroup:
Date time information
Keywords:
date
Values:
2008-07-21
2008-07-28
2008-07-18
2008-07-03
2008-07-11
Contributors:
No information available

Dataset column

Name:
target_group
Definition:
focal plot around the target tree including tree neighbours
Unit:
No information available
Datagroup:
Group of competitors around a target tree for tree tree interaction.
Keywords:
competitive neighbourhood, location
Values:
CSP_02Ss
CSP_02Ce
CSP_02Ch
CSP_02Qs
CSP_01Qs
Contributors:
No information available

Dataset column

Name:
tree_status
Definition:
target tree or competitor. The name consists of the CSP name and an acronym for the target tree species. CSP_*Ss CSP number Schima superba, CSP_*Ce CSP number Castanopsis eyrei, CSP_*Qs CSP number Quercus serrata, CSP_*Ch CSP number Castanea henrii
Unit:
No information available
Datagroup:
Helper
Keywords:
competition
Values:
CSP_01Qs
CSP_01QsC04
CSP_01QsC03
CSP_01QsC01
CSP_01QsC02
Contributors:
No information available

Dataset column

Name:
species
Definition:
name of the tree species
Unit:
No information available
Datagroup:
Scientific plant species name
Keywords:
species, explanatory
Values:
Acer cordatum
Alangium kurzii
Albizia kalkora
Castanea henryi
Adinandra millettii
Contributors:
No information available

Dataset column

Name:
species_comment
Definition:
species_comment
Unit:
No information available
Datagroup:
Helper
Keywords:
No information available
Values:
secies not quite sure, may be a different one and should be treated with care
species unsure, species name added from dataset "CSP_tree_stem_reference_list" (Dataset nr 238 on the protal) according to silverID/stem_tag. Should be treated with care.
Contributors:
No information available

Dataset column

Name:
silverID
Definition:
number on silver tag attached to the tree. Trees with "BRIM" in front of the common 6 digits ID have been added to the present investigation by taging trees in an extra permanent plot near the CSP12 (responsible person for questions: Minjiang Yu)
Unit:
No information available
Datagroup:
CSP metal tag number (trees, woody debris)
Keywords:
tree
Values:
363502
363512
363055
275831
363553
Contributors:
No information available

Dataset column

Name:
silverID_comment
Definition:
silverID_comment
Unit:
No information available
Datagroup:
Helper
Keywords:
No information available
Values:
Stefan: 379758
Contributors:
No information available

Dataset column

Name:
pos_azimuth
Definition:
angle seen from "relative point", compass
Unit:
gon (0-400)
Datagroup:
Azimuth
Keywords:
tree position
Values:
100
0
101
1
10
Contributors:
No information available

Dataset column

Name:
pos_dist
Definition:
ground distance to relative point, Vertex Forester
Unit:
m
Datagroup:
Helper
Keywords:
No information available
Values:
0.5
0.4
0.6
0
0.3
Contributors:
No information available

Dataset column

Name:
pos_hdist
Definition:
horizontal distance to relative point, Vertex Forester
Unit:
m
Datagroup:
Helper
Keywords:
No information available
Values:
0.2
0.4
0.6
0.5
0
Contributors:
No information available

Dataset column

Name:
rel_point
Definition:
relative point to which individual trees are measured. NE north eastern corner of CSP, NW north western corner of CSP, SE south eastern corner of CSP, SW south western corner of CSP, T target tree
Unit:
No information available
Datagroup:
Helper
Keywords:
No information available
Values:
NE
NE inner
Mittel NE
NO
NE/ 40 NW
Contributors:
No information available

Dataset column

Name:
dbh
Definition:
diameter at breast hight
Unit:
cm
Datagroup:
Diameter at breast height
Keywords:
biomass, dbh, tree performance, explanatory
Values:
10.12
10.13
10.03
10.1
10
Contributors:
No information available

Dataset column

Name:
tot_hi
Definition:
total height
Unit:
m
Datagroup:
Plant height
Keywords:
height, tree performance, explanatory
Values:
10.4
10
10.1
10.2
10.3
Contributors:
No information available

Dataset column

Name:
bifurcat
Definition:
height of bifurcation point
Unit:
m
Datagroup:
Bifurcation point
Keywords:
bifurcation point, crown architecture
Values:
1
0.6
0
10
0.3
Contributors:
No information available

Dataset column

Name:
cr_length
Definition:
cr_length
Unit:
No information available
Datagroup:
Crown architecture
Keywords:
No information available
Values:
0.3
0.1
0.2
0
0.4
Contributors:
No information available

Dataset column

Name:
cr_ratio
Definition:
cr_ratio
Unit:
No information available
Datagroup:
Crown architecture
Keywords:
No information available
Values:
0.04
0.02
0.03
0.01
0
Contributors:
No information available

Dataset column

Name:
stem_slend
Definition:
stem_slend
Unit:
No information available
Datagroup:
Stem morphology
Keywords:
No information available
Values:
0.13
0.15
0.17
0.2
0.14
Contributors:
No information available

Dataset column

Name:
nndist
Definition:
widest extension of the crown in northern direction (ground distance)
Unit:
m
Datagroup:
Crown architecture
Keywords:
crown architecture
Values:
0.2
0.4
0.1
0.3
0
Contributors:
No information available

Dataset column

Name:
nnhdist
Definition:
widest extension of the crown in northern direction (horizontal distance)
Unit:
m
Datagroup:
Crown architecture
Keywords:
No information available
Values:
0.4
0
0.1
0.3
0.2
Contributors:
No information available

Dataset column

Name:
nedist
Definition:
widest extension of the crown in northeastern direction (ground distance)
Unit:
m
Datagroup:
Crown architecture
Keywords:
No information available
Values:
0.2
0
0.1
0.3
0.4
Contributors:
No information available

Dataset column

Name:
nehdist
Definition:
widest extension of the crown in northeastern direction (horizontal distance)
Unit:
m
Datagroup:
Crown architecture
Keywords:
No information available
Values:
0.4
0.1
0.3
0.2
0
Contributors:
No information available

Dataset column

Name:
eedist
Definition:
widest extension of the crown in eastern direction (ground distance)
Unit:
m
Datagroup:
Crown architecture
Keywords:
crown architecture
Values:
0.2
0.3
0.4
0
0.1
Contributors:
No information available

Dataset column

Name:
eehdist
Definition:
widest extension of the crown in eastern direction (horizontal distance)
Unit:
m
Datagroup:
Crown architecture
Keywords:
No information available
Values:
0
0.3
0.2
0.4
0.1
Contributors:
No information available

Dataset column

Name:
sedist
Definition:
widest extension of the crown in southeastern direction (ground distance)
Unit:
m
Datagroup:
Crown architecture
Keywords:
No information available
Values:
0.4
0
0.3
0.1
0.2
Contributors:
No information available

Dataset column

Name:
sehdist
Definition:
widest extension of the crown in southeastern direction (horizontal distance)
Unit:
m
Datagroup:
Crown architecture
Keywords:
No information available
Values:
0.3
0
0.2
0.4
0.1
Contributors:
No information available

Dataset column

Name:
ssdist
Definition:
widest extension of the crown in southern direction (ground distance)
Unit:
m
Datagroup:
Crown architecture
Keywords:
crown architecture
Values:
0.2
0.1
0
0.4
0.3
Contributors:
No information available

Dataset column

Name:
sshdist
Definition:
widest extension of the crown in southern direction (horizontal distance)
Unit:
m
Datagroup:
Crown architecture
Keywords:
No information available
Values:
0.4
0
0.1
0.2
0.3
Contributors:
No information available

Dataset column

Name:
swdist
Definition:
widest extension of the crown in southwestern direction (ground distance)
Unit:
m
Datagroup:
Crown architecture
Keywords:
No information available
Values:
0.2
0.4
0.1
0
0.3
Contributors:
No information available

Dataset column

Name:
swhdist
Definition:
widest extension of the crown in southwestern direction (horizontal distance)
Unit:
m
Datagroup:
Crown architecture
Keywords:
No information available
Values:
0.1
0.4
0.3
0.2
0
Contributors:
No information available

Dataset column

Name:
wwdist
Definition:
widest extension of the crown in western direction (western distance)
Unit:
m
Datagroup:
Crown architecture
Keywords:
crown architecture
Values:
0
0.3
0.4
0.2
0.1
Contributors:
No information available

Dataset column

Name:
wwhdist
Definition:
widest extension of the crown in western direction (horizontal distance)
Unit:
m
Datagroup:
Crown architecture
Keywords:
No information available
Values:
0.4
0.2
0
0.3
0.1
Contributors:
No information available

Dataset column

Name:
nwdist
Definition:
widest extension of the crown in northwestern direction (ground distance)
Unit:
m
Datagroup:
Crown architecture
Keywords:
No information available
Values:
0.2
0.3
0
0.1
0.4
Contributors:
No information available

Dataset column

Name:
nwhdist
Definition:
widest extension of the crown in northwestern direction (horizontal distance)
Unit:
m
Datagroup:
Crown architecture
Keywords:
No information available
Values:
0
0.2
0.1
0.3
0.4
Contributors:
No information available

Dataset column

Name:
st_nnhdist
Definition:
shortest extension of the crown in nn direction, if not zero (stem); only possible for crowns whose crown does not overtop the stem in one or more directions
Unit:
m
Datagroup:
Crown architecture
Keywords:
No information available
Values:
0.7
0.5
0.4
0.6
0.3
Contributors:
No information available

Dataset column

Name:
st_nndist
Definition:
shortest extension of the crown in nn direction, if not zero (stem); only possible for crowns whose crown does not overtop the stem in one or more directions.
Unit:
m
Datagroup:
Crown architecture
Keywords:
No information available
Values:
0.6
0.4
0.3
0.5
0.7
Contributors:
No information available

Dataset column

Name:
st_nehdist
Definition:
shortest extension of the crown in nn direction, if not zero (stem); only possible for crowns whose crown does not overtop the stem in one or more directions
Unit:
m
Datagroup:
Crown architecture
Keywords:
No information available
Values:
0.1
0.8
0.5
0.4
0.7
Contributors:
No information available

Dataset column

Name:
st_nedist
Definition:
shortest extension of the crown in nn direction, if not zero (stem); only possible for crowns whose crown does not overtop the stem in one or more directions
Unit:
m
Datagroup:
Crown architecture
Keywords:
No information available
Values:
0.5
0.7
0.3
0.1
0.4
Contributors:
No information available

Dataset column

Name:
st_eehdist
Definition:
shortest extension of the crown in nn direction, if not zero (stem); only possible for crowns whose crown does not overtop the stem in one or more directions
Unit:
m
Datagroup:
Crown architecture
Keywords:
No information available
Values:
0.5
0.7
0.3
0.6
0.4
Contributors:
No information available

Dataset column

Name:
st_eedist
Definition:
shortest extension of the crown in nn direction, if not zero (stem); only possible for crowns whose crown does not overtop the stem in one or more directions
Unit:
m
Datagroup:
Crown architecture
Keywords:
No information available
Values:
0.3
0.5
0.6
0.4
0.7
Contributors:
No information available

Dataset column

Name:
st_sehdist
Definition:
shortest extension of the crown in nn direction, if not zero (stem); only possible for crowns whose crown does not overtop the stem in one or more directions
Unit:
m
Datagroup:
Crown architecture
Keywords:
No information available
Values:
0.4
0.7
0.3
0.5
0.6
Contributors:
No information available

Dataset column

Name:
st_sedist
Definition:
shortest extension of the crown in nn direction, if not zero (stem); only possible for crowns whose crown does not overtop the stem in one or more directions
Unit:
m
Datagroup:
Crown architecture
Keywords:
No information available
Values:
0.4
0.3
0.6
0.5
0.9
Contributors:
No information available

Dataset column

Name:
st_sshdist
Definition:
shortest extension of the crown in nn direction, if not zero (stem); only possible for crowns whose crown does not overtop the stem in one or more directions
Unit:
m
Datagroup:
Crown architecture
Keywords:
No information available
Values:
0.2
0.5
0.7
0.3
0.6
Contributors:
No information available

Dataset column

Name:
st_ssdist
Definition:
shortest extension of the crown in nn direction, if not zero (stem); only possible for crowns whose crown does not overtop the stem in one or more directions
Unit:
m
Datagroup:
Crown architecture
Keywords:
No information available
Values:
0.5
0.6
0.7
0.2
0.8
Contributors:
No information available

Dataset column

Name:
st_swdist
Definition:
shortest extension of the crown in nn direction, if not zero (stem); only possible for crowns whose crown does not overtop the stem in one or more directions
Unit:
m
Datagroup:
Crown architecture
Keywords:
No information available
Values:
0.3
0.2
0.4
0.1
0.5
Contributors:
No information available

Dataset column

Name:
st_swhdist
Definition:
shortest extension of the crown in nn direction, if not zero (stem); only possible for crowns whose crown does not overtop the stem in one or more directions
Unit:
m
Datagroup:
Crown architecture
Keywords:
No information available
Values:
0.3
0.4
0.5
0.2
0.1
Contributors:
No information available

Dataset column

Name:
st_wwhdist
Definition:
shortest extension of the crown in nn direction, if not zero (stem); only possible for crowns whose crown does not overtop the stem in one or more directions
Unit:
m
Datagroup:
Crown architecture
Keywords:
No information available
Values:
0.4
0.5
0.2
0.3
0.1
Contributors:
No information available

Dataset column

Name:
st_wwdist
Definition:
shortest extension of the crown in nn direction, if not zero (stem); only possible for crowns whose crown does not overtop the stem in one or more directions
Unit:
m
Datagroup:
Crown architecture
Keywords:
No information available
Values:
0.5
0.3
0.1
0.2
0.4
Contributors:
No information available

Dataset column

Name:
st_nwhdist
Definition:
shortest extension of the crown in nn direction, if not zero (stem); only possible for crowns whose crown does not overtop the stem in one or more directions
Unit:
m
Datagroup:
Crown architecture
Keywords:
No information available
Values:
0.1
0.4
0.3
0.5
0.2
Contributors:
No information available

Dataset column

Name:
st_nwdist
Definition:
shortest extension of the crown in nn direction, if not zero (stem); only possible for crowns whose crown does not overtop the stem in one or more directions
Unit:
m
Datagroup:
Crown architecture
Keywords:
No information available
Values:
0.3
0.1
0.5
0.4
0.2
Contributors:
No information available

Dataset column

Name:
crownstartdist
Definition:
ground distance to starting of crown, for crowns extending only in one direction
Unit:
m
Datagroup:
Crown architecture
Keywords:
No information available
Values:
0.1
0.6
0.5
0.4
0
Contributors:
No information available

Dataset column

Name:
crownstarthdist
Definition:
horizontal distance to starting of crown, for crowns extending only in one direction
Unit:
m
Datagroup:
Crown architecture
Keywords:
No information available
Values:
0.1
0
0.4
0.5
0.6
Contributors:
No information available

Dataset column

Name:
crownenddist
Definition:
ground distance to the end of the crown, for crowns extending only in one direction
Unit:
m
Datagroup:
Crown architecture
Keywords:
No information available
Values:
10.5
1.7
10
11.4
12.7
Contributors:
No information available

Dataset column

Name:
crownendhdist
Definition:
horizontal distance to the end of the crown, for crowns extending only in one direction
Unit:
m
Datagroup:
Crown architecture
Keywords:
No information available
Values:
10
2.2
10.5
10.4
1.3
Contributors:
No information available

Dataset column

Name:
crowndirect
Definition:
direction of the crownspine
Unit:
subcardinale directions
Datagroup:
Crown architecture
Keywords:
No information available
Values:
215
190
188
115
158
Contributors:
No information available

Dataset column

Name:
perp1dir
Definition:
1st perpendicular direction to the crown spine direction
Unit:
subcardinale directions
Datagroup:
Crown architecture
Keywords:
No information available
Values:
115
177
122
160
112
Contributors:
No information available

Dataset column

Name:
perp1dist
Definition:
widest extension of the crown in the 1st perpendicular direction (ground distance), from the middle of the distance (crownend -crownstart)
Unit:
m
Datagroup:
Crown architecture
Keywords:
No information available
Values:
0.25
0.2
0
0.3
0.1
Contributors:
No information available

Dataset column

Name:
perp1hdist
Definition:
widest extension of the crown in the 1st perpendicular direction (horizontal distance), from the middle of the distance (crownend -crownstart)
Unit:
m
Datagroup:
Crown architecture
Keywords:
No information available
Values:
0
0.3
0.25
0.1
0.2
Contributors:
No information available

Dataset column

Name:
perp2dir
Definition:
second perpendicular direction to the crown spine direction
Unit:
subcardinale directions
Datagroup:
Crown architecture
Keywords:
No information available
Values:
290
120
288
258
176
Contributors:
No information available

Dataset column

Name:
perp2dist
Definition:
widest extension of the crown in the second perpendicular direction (ground distance), from the middle of the distance (crownend -crownstart)
Unit:
m
Datagroup:
Crown architecture
Keywords:
crown architecture
Values:
0
0.2
0.3
0.25
0.1
Contributors:
No information available

Dataset column

Name:
perp2hdist
Definition:
widest extension of the crown in the second perpendicular direction (horizontal distance), from the middle of the distance (crownend -crownstart)
Unit:
m
Datagroup:
Crown architecture
Keywords:
No information available
Values:
0.25
0.3
0.1
0
0.2
Contributors:
No information available

Dataset column

Name:
cover
Definition:
percentage coverage of the projected crown; estimation of how much percent of the projected crown area (surroundes by the measured points) are covered by leaves and branches (I-V, in 20% steps)
Unit:
No information available
Datagroup:
Vegetation layer cover
Keywords:
crown architecture, explanatory
Values:
sp2 I
sp2 II
sp2 V
sp2 IV
sp2 III
Contributors:
No information available

Dataset column

Name:
loss
Definition:
percentage of loss due to the snow break event in Feb 2008
Unit:
No information available
Datagroup:
Percentage of crown loss due to disturbance
Keywords:
disturbance, ice storm
Values:
d0
d1
d4
d2
d3
Contributors:
No information available

Dataset column

Name:
st_incl_dist
Definition:
ground distance of the bifurcation point from the stem base in the direction of slope aspect
Unit:
m
Datagroup:
Stem morphology
Keywords:
No information available
Values:
0.1
-0.1
0
-0.2
0.2
Contributors:
No information available

Dataset column

Name:
st_incl_hdist
Definition:
horizontal distance of the bifurcation point from the stem base in the direction of slope aspect
Unit:
m
Datagroup:
Stem morphology
Keywords:
tree performance, stem morphology
Values:
0.1
-0.1
0.2
0
-0.2
Contributors:
No information available

Dataset column

Name:
st_incl_rad
Definition:
calculated stem inclination in rad
Unit:
rad
Datagroup:
Stem morphology
Keywords:
No information available
Values:
0.00909116
0.010638699
-0.009709043
0
-0.008849789
Contributors:
No information available

Dataset column

Name:
st_incl_degree
Definition:
calculated stem inclination in degree
Unit:
°
Datagroup:
Stem morphology
Keywords:
No information available
Values:
-0.507055533
0.609552565
-0.556287183
0.520885072
0
Contributors:
No information available

Dataset column

Name:
stem_azi
Definition:
azimuth of the stem
Unit:
gon (0-400)
Datagroup:
Stem morphology
Keywords:
No information available
Values:
120
10
100
0
110
Contributors:
No information available

Dataset column

Name:
m_cr_dia
Definition:
mean crown diameter
Unit:
m
Datagroup:
Crown architecture
Keywords:
explanatory
Values:
0.1375
0
0.2
0.2125
0.1875
Contributors:
No information available

Dataset column

Name:
cr_a_t
Definition:
crown area calculated from triangles
Unit:
squaremeter
Datagroup:
Crown architecture
Keywords:
crown architecture, explanatory
Values:
0
0.063817764
0.031415927
0.117809725
0.09424778
Contributors:
No information available

Dataset column

Name:
cr_a_p
Definition:
corwn area calculated from polygons
Unit:
squaremeter
Datagroup:
Crown architecture
Keywords:
explanatory
Values:
0
0.031415927
0.053033009
0.09424778
0.117809725
Contributors:
No information available

No information available


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11 h%c3%a4rdtle medium

Werner
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Goddert
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Anne
Lang

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