Figure 3.

Bootstrapped Pearson’s correlation coefficients between mean seasonal VPD and tree-ring chronologies of (a) δ¹³C, (b) δ¹⁸O, (c) δ²H and (d) RWI for the period 2000–2020 at the three study sites (Ges, Kun, Som). Months in capital letters indicate months of the year of tree-ring formation. See Table 1 and Fig. 1 for the full names of the sites and their location. The colored cells with the values indicate significant correlations (P-value ≤ 0.05).