Table 5 (a) Linear mixed model on the annual basal area increment (mm²·yr.^− 1) of all analyzed trees (response variable) with the individual tree code as random effect and fixed effects logarithmized age related to the factor time of growth (period before 1960 and period since 1960), SD: Standard deviation, AIC: Akaike Information Criterion

a

Intercept

− 5.40 ± 0.14

<  0.001

log(age_ij)

Age

1.16 ± 0.04

<  0.001

time of growth _ij

Time of growth

−0.34 ± 0.13

0.01

b x time of growth_ij x log(age_ij)

Age x Time of growth

0.07 ± 0.04

0.06

0.47

–

0.19

–

− 1664.82

–