Fig. 3.
Leaf ∆13C discrimination (control n = 3, roof n = 3 per stand and species) of the five functional groups (∆13Cfg) at different campaigns during two growing seasons. The boxes show medians and quartiles, the whiskers show 1.5 times the interquartile range of the data. The asterisks marks significant differences (P<0.05*) tested with a linear model on the basis of the mean values. LS12 Late summer 2012, ES13 early summer 2013, LS13 late summer 2013. The results of the linear mixed effects model for the ∆13C of the different functional groups as a function of exploratory, management intensity, treatment (precipitation reduction), group and the interaction of group and treatment are given in Table S4