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Figure S1. Clima diagram for the sitesGüttingen (close to Tägerwilen, 10 km), Wynau (close toCorcelles, 25 km), Sion (close to Leuk, 22 km) and diagram fromSWISS METEO. The diagram shows the mean annual precipitation(Niederschlag [mm]) and temperature (Temperatur [°C]) courseover the years from 1961 to 1990.

Figure S2. Overview of the experimental designused. a) Set up of the treatments and the split-split plotarrangement in each open-top chamber (OTC), with two soil types,each split into two stands. b) Within-chamber arrangement of thetrees and measuring devices. c) Side view of the OTC (1.1-1.4) onthe 21 August 2009, with the moveable roof and different opening ofthe side walls according to the air-warming treatment. From Kusteret al. (2012).

Table S1. Location and climaticcharacterisation of provenance sites. Mean annual temperature(°C) (Temp) and mean annual precipitation (mm) (Precip) weretaken from SWISS METEO stations located near the provenance sites(Arend et al. 2011).

Table S2. Incubation protocol for enzyme tests. The tested enzymes were leucine-aminopeptidase, xylosidase, glucuronidase, cellobiohydrolase, N-acetyl-glucosaminidase, b-glucosidase, phosphatase.

Table S3. Effects of drought, air warming andtheir interaction on the relative abundance of Cenococcumgeophilum ectomycorrhizae on Quercus robur (a), Q.petraea (b), and Q. pubescens (c) as calculated with two-way ANOVA and using the Bonferroni correction for significance at the uncorrected P = 0.05 level (sig).

Table S4. Effects of drought, air warming andtheir interaction on the total enzyme activity of Cenococcumgeophilum ectomycorrhizae on Q. robur (a), Q.petraea (b) and Q. pubescens (c) as calculated with two-way ANOVA and using the Bonferroni correction for significance at the uncorrected P = 0.05 level (sig).

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