TABLE 1.
Results of the best models explaining tree growth resistance, recovery, and resilience of Scots pine trees along the studied gradient. From the 16 tested models, only the three with the highest Akaike's information criterion (AICc) weight are presented
| Models | Hypotheses | References | AICc | ∆AICc | AICc weight | R 2 (fixed) | R 2 (fixed and random) |
|---|---|---|---|---|---|---|---|
| Resistance (RT) | Tree resistance to drought is affected by | ||||||
| RT~all variables | Full model | 117.9 | 0.0 | 1.00 | .33 | .49 | |
| RT~D_INT*PGR+D_INT*ST | The intensity of the drought, but depending upon the growth prior to drought and site types | Adapted from Gazol et al. (2018) | 130.4 | 12.5 | 0.00 | .22 | .46 |
| RT~D_FRE*PGR | The frequency of the drought, but depending upon the growth prior to drought | Adapted from Gao et al. (2018) | 130.5 | 12.6 | 0.00 | .14 | .47 |
| Recovery (RC) | Tree recovery after drought | ||||||
| RC~D_INT*ST | Is affected by the intensity of the drought, but depending upon the site types | Adapted from Gazol et al. (2018) | 301.9 | 0.0 | 0.74 | .16 | .36 |
| RC~ST | Decreased with site types | Sánchez‐Salguero et al. (2018) | 307.0 | 5.1 | 0.06 | .07 | .37 |
| RC~D_INT+D_FRE+D_DUR | Is affected combinedly by intensity of drought, duration of drought, and frequency of drought | Gao et al. (2018) | 308.4 | 6.5 | 0.03 | .08 | .37 |
| Resilience (RS) | Tree resilience to drought is | ||||||
| RS~D_DUR*PGR | Affected by the duration of the drought, but depending upon the growth prior to drought | Adapted from Taeger et al. (2013) | 342.4 | 0.0 | 0.45 | .03 | .35 |
| RS~PGR | Negatively associated with the growth prior to drought | Zang et al. (2014); Ruijven and Berendse (2010) | 344.3 | 1.9 | 0.17 | .02 | .35 |
| RS~D_FRE*PGR | Affected by the frequency of the drought, but depending upon the growth prior to drought | Adapted from Gao et al. (2018) | 344.6 | 2.2 | 0.15 | .02 | .36 |
PGR = average tree growth (ring width indices) prior to drought, ST = site type (LEHP (low‐elevation sites with high productivity), MELP (mid‐elevation sites with low productivity), and HELP (high‐elevation sites with low productivity)), D_FRE = drought frequency measured by the number of drought years within the past 10 years from the studied drought, D_INT = intensity of drought, and D_DUR = duration of drought, *indicates an interaction term and +indicates an additive term, PGR was quantified from tree growth during the 10 consecutive years prior to drought excluding the years considered as predrought period quantifying the three indices (i.e., resistance, recovery, and resilience).