Neighbouring trees to the trees sampled for the damage assessment caused by herbivorous insects

Usage Rights

This data is Private.

Acknowledgements to Sylvie Ladet and Wilfried Heintz

Dataset Abstract

This dataset includes the 1627 trees sampled for herbivory damage. For each focal tree sampled, we extracted the list of neighboring trees. We used euclidian distance between focal and neighbour trees, calculated with Arcgis software and ArcToolbox option. The aim of this dataset is to work on the tree diversity effects at a neighbour scale.

Dataset Design

For the list of focal trees, we selected at random 3 individuals per species per plot in mixture among the 6 biggest DBH and 6 trees in monocultures among the 12 biggest DBH. Some plots have more trees sampled. For each tree, the CrownCrossSectionalArea (from dataset "Plot descriptors - tree data") was used to calculate a radius and we used tree coordinates as centre. A circle was drawn for each tree to represent the tree crown. A tree is considered as neighbour if its crown is at a distance of less than 3 meters from the crown of focal tree. Each stem is considered as an individual. Dead trees are eliminated.

Focal trees were also sampled for pathogens damage assessment, Carbon and Nitrogen element analyses, stable isotope composition, and chlorophyll fluorescence.

Spatial Extent

Exploratory sites from Italy, Germany, Finland, Spain, Romania, Poland

Taxonomic Extent

Focal tree species are : Abies alba, Acer pseudoplatanus, Betula pendula, Carpinus betulus, Castanea sativa, Fagus sylvatica, Fraxinus excelsior, Ostrya carpinifolia, Picea abies, Pinus nigra, Pinus sylvestris, Quercus cerris, Quercus faginea, Quercus ilex, Quercus petraea, Quercus robur, Quercus rubra

Data Analysis

With this dataset, it is possible to work at a subplot level and calculate diversity indices, tree apparency… However, information about neighbours is incomplete for focal trees close to the plot border. Therefore, the distance of the focal tree to the border is mentionned.

Data columns available in the raw data part of this dataset

Id_plot
Unique plot id
Data group: Exploratory plot id
Values
FIN02
FIN01
FIN04
FIN05
FIN03
Id_focal
Unique focal tree number
Data group: Tree number
Values
1
101
102
104
10
Sp_focal
Focal tree species code
Data group: Tree species code
Values
BETPEN
CARBET
ABIALB
CASSAT
ACEPSE
Id_neigb
Unique neighboring tree number
Data group: Tree number
Values
102
100
10
101
1
Sp_neigb
Neighboring tree species code
Data group: Tree species code
Values
ACEPSE
ACECAM
ACEPLA
ABIALB
ACEMON
Dist_cr
Edge to edge distance between the focal and neighboring crown
Unit: m
Data group: Distance
Values
0.0007
0.0009
0
0.0012
0.0005
Dist_cred
Distance between the focal crown and the plot border
Unit: m
Data group: Distance
Values
0.0498
0.0299
0.0199
0.0499
0
Dist_st
Distance between the focal and neighboring stems
Unit: m
Data group: Distance
Values
0.0025
0.1
0.1484
0.1995
0
Dist_sted
Distance between the focal stem and the plot border
Unit: m
Data group: Distance
Values
-0.0193
-0.0148
-0.0151
0
0.01