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Table 4 Pearson correlation coefficients between δ15N, N, δ13C and C in trees foliage, fine roots and surface soil layer (0–10 cm)

From: Variations in the natural 13C and 15N abundance of plants and soils under long-term N addition and precipitation reduction: interpretation of C and N dynamics

  Foliage 15N+ Foliage N& Foliage 13C Foliage C# Fine root 15N Fine root N Fine root 13C# Fine root C# Soil layer 15N# Soil layer N+ Soil layer 13C
Foliage 15N+ 1           
Foliage N& 0.175           
Foliage 13C −0.382* 0.381*          
Foliage C# 0.268 −0.779** −0.613**         
Fine root 15N −0.229 −0.404* −0.623** 0.661**        
Fine root N −0.290 −0.745** −0.430* 0.603 0.337       
Fine root 13C# 0.180 −0.077 0.512** −0.159 − 0.481* −0.034      
Fine root C# −0.066 0.108 −0.157 0.106 0.233 −0.399* −0.390*     
Soil layer 15N# −0.554** 0.061 0.143 −0.276 −0.356 0.170 0.069 −0.163    
Soil layer N+ 0.418* 0.242 0.233 −0.082 0.154 −0.452** − 0.056 0.241 − 0.502**   
Soil layer 13C 0.275 −0.331 −0.117 0.097 −0.307 0.327 0.062 −0.274 0.438** −0.678**  
Soil layer C+ 0.496** 0.091 0.078 0.003 0.188 −0.374* − 0.054 0.187 − 0.720** < 0.830** − 0.001
  1. To approximate normality, the response variables are Ln-transferred. # Log; + Square; & Exponent. * The level of significance of correlations is p < 0.05. ** The level of significance of correlations is p < 0.01