Fig. 1
From: Drought and frost resistance of trees: a comparison of four species at different sites and altitudes
Pressure at 50% loss of conductivity (mean P 50 ± SE) in F. sylvatica, S. aucuparia, L. decidua and P. abies at four sites (described in Table 1) in winter and in summer. Hatched bars show Tyrolean sites; open bars, Auvergne sites. A part of P 50 values of P. abies at low altitude (summer) are from Beikircher et al. (2010). Different letters indicate significant differences (P < 0.05) between different sites per species, respectively. Stars indicate significant differences between winter and summer