Fig. 5 Leaf net-photosynthesis (Aleaf) and relative
height increment of oak (Quercus petraea ) and beech (Fagus
sylvatica ) saplings treated with four drought durations in 2018 and
well-watered in 2019. D0 (watering weekly), D1 (watering biweekly), D2
(watering monthly), and D3 (watering bimonthly) represent the drought
duration. Different letters indicate significant difference in
parameters among D0, D1, D2, and D3.