Fig. 1 Mortality rate of oak (Quercus petraea ) and beech (Fagus sylvatica ) saplings at the end of a recovery growing season following a growing season with 4 drought duration treatment (D0 = watering weekly, D1 = watering biweekly, D2 = watering monthly, and D3 = watering bimonthly) combined with N-fertilization (1.68 g N kg-1 dry soil fertilized vs. unfertilized).