Table 1. Drought periods and air warming.

Treatment	Drought (weeks) 1
	the 1 st D		the 2 nd D
	acidic soil	calcareous	acidic	calcareous
D	2.5 ± 0.8	4.6 ± 0.8	1.7 ± 0.4	3.1 ± 0.4
AWD	1.7 ± 0.5	7.2 ± 0.8	1.6 ± 0.3	3.4 ± 0.4
	Air warming 2
	April		May—September
AW	+ 2.0°C		+ 1.1°C

¹Mean number of weeks (± SE) per drought period with a continuous soil water content < 0.06 m^3.m^-3 at a soil depth from 0 to 25 cm in the D and AWD treatment, see [10] for details.

²Warming of daytime air temperature (8:00–18:00 h, UTC+1) (compared to the control), details see [30].