Fig. 5.
Understory community 13C discrimination (Cs) of the eight different managed stands at three different campaigns. The boxes show medians and quartiles, the whiskers show 1.5 times the interquartile range of the data. For statistical analyses see Table S10. S Schorfheide, H Hainich, A Schwäbische Alb, LS12 late summer 2012, ES13 early summer 2013, LS13 late summer 2013. Note: In the leaf bulk material is a mixture of structural carbon as well as of storage compounds and freshly assimilated carbon (Adams and Grierson 2001; Werner et al. 2012). Stored carbon is used for early leaf growth in plants (Gaudinski et al. 2009; Muhr et al. 2016). Thus, we did not analyzed the leaf samples for ∆13C in spring 2012. At the Schwäbische Alb in early summer 2013 we could not take ∆13C samples at the beech unmanaged stand because of rain. We did not measure stand Schorfheide beech unmanaged, because the understory coverage was <0.5%