All data was tested with a one-way analysis of variance (ANOVA); significance
was determined with the Tukey Honest Significance Difference
(Tukey HSD) post-hoc test with a significance level of 99.9%.
All positions were tested for significant differences between 13C
incorporation in soil, microbial biomass and PLFAs. For every microbial
group and soil pool, the difference in DI for the seven specific
13C-labeled positions was also tested for significance. All
statistical tests were performed with R version 3.0.0 (03.04.2013).