Fig. 6: Correlation between rescaled deviation of soil enzymatic activity from three null model predictions and normalized dissimilarity index.

a(1)–d(3) Scatter plots show the standardized deviation of soil enzymatic activity from null model predictions for multiple-factor treatments. Net interaction type of each multiple-factor treatment is marked as different colored points (antagonistic, blue; synergistic, red; no interaction, gray). The better-fitting null model for each soil enzymatic activity has been selected based on the smallest model sum of squared deviation (SSD), and is indicated by the bold frame [a(2), b(3), c(2) and d(2)]. The correlations between standardized deviation of soil enzymatic activity from null model predictions and normalized dissimilarity index are shown in linear correlation with 95% confidence intervals (CIs). The statistical test used was two-sided. Spearman correlation coefficients and significance of correlations are indicated by R and p, respectively.