Figure S1 Original experimental design which was maintained for the years 1996–1998. Free succession took place since 1999 within the constraint of two biomass harvests per year. The bare ground plots (0 species) were not included into the present analyses

Figure S2 Mean summer air temperature (June, July, August) in the study years. Recurrence based on extreme value statistics for the period 1851–2008.

Table S1 Plant species mixtures of the original experimental design as installed in 1996. Numbers indicate the plots where the mixtures where sown (Block A: plots 1–32, block B: plots 33–64, bare ground plots (12, 29, 41, 61) are not included in this study).

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