Table 1 Description of dendrochronological variables of cored trees

No. of cored trees

20

22

20

Mean DBH (cm)

28.6 (1.0)

32.8 (1.3)

33.6 (2.5)

Mean/maximum length of series (years)

45 (1)/56

45 (1)/59

64 (7)/143

Mean tree-ring width (mm)

2.51 (0.04)

2.74 (0.04)

1.77 (0.03)

Mean basal area increment (cm²)

10.6 (0.3)

13.4 (0.3)

10.5 (0.2)

Mean basal area increment since 1971 (cm²)

11.7 (0.3)

15.4 (0.3)

10.6 (0.2)

Mean correlation between trees

0.34

0.29

0.17

Expressed population signal since 1971

0.95

0.94

0.88