Geographical location of the Syppre experimental platforms on a climate map (Joly et al., 2010) with soil type according to geographical regions: Béarn, Berry, Champagne, Lauragais, Picardie. The types correspond to the following climates. Type 1: mountain climate; Type 2: semi-continental climate and the mountain margins climate; Type 3: Modified oceanic climate of the Central and Northern Plains; Type 4: Semi-oceanic climate; Type 5: Oceanic climate; Type 6: Semi-mediterranean climate; Type 7: Southwestern Basin climate; Type 8: Mediterranean climate.