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This data is associated with the following publication:
Fine root vitality decline results in reduced branch formation in mature beech stands after drought -
Alexandra Koller, Alina Azekenova, Karl-Heinz Feger, Karsten Kalbitz, Goddert von Oheimb

Published in:
Forest Ecology and Management

contact: alexandra.koller@tu-dresden.de 
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identifier: identifier of the study plot
tree_id: identifier assign to each tree within the sample plot

bi: Branching intensity; The total number of second-order branches per unit length of first-order branches [m^-1]  
cpa: Crown projection area divided by the diameter breast height of the respective tree [m^2]
sum_length_fine: The sum of the fine branch lengths per crown length of the respective tree divided by diameter breast height (DBH) of respective tree to account for size effect [m]
                 Fine branches were defined as branches of the 3rd and higher orders.
transparency: The CPA determined with a concavity of 0.1 normalised by the CPA with a concavity of 1 of a tree subtracted by 1
top_heavy_crown: The sum of filled voxels in 61 – 90 % crown heigh divided by number of all filled voxels per tree

Stepwise approach for modelling:
radius: Size of the study plot the respective tree belongs to [m]
collective: Collective the respective tree belongs to based on tree height.
            If trees belong to the top 25% of the stand height of the respective study plot they were chosen to represent the (co)dominant trees and are labled as "dominant"