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Table 1 Overview of the number of plots (N) for each combination of focal tree species (numbers in the matrix); the frequency of each species is given for each species richness level (SR) and for the entire set of plots (overall)

From: Understorey phylogenetic diversity in thermophilous deciduous forests: overstorey species identity can matter more than species richness

  Q. cerris Q. ilex Q. petraea C. sativa O. carpinifolia
SR = 1 (N = 10) 2     
  2    
   2   
    2  
     2
Freq. 2 2 2 2 2
SR = 2 (N = 9) 1 1    
1   1   
  1 1   
1    1  
  1   1  
   1 1  
1     1
  1    1
    1 1
Freq. 4 4 3 4 3
SR = 3 (N = 9) 1 1 1   
1 1   1  
2   2 2  
  1 1 1  
1 1    1
1   1   1
  1 1   1
  1   1 1
Freq. 6 6 5 4 4
SR = 4–5 (N = 8) 2 2 2 2  
2 2 2   2
2 2   2 2
  1 1 1 1
1 1 1 1 1
Freq. 7 8 6 6 6
Overall freq. 19 20 16 16 15
Freq. (%) 52.8 55.6 44.4 44.4 41.7