Table 3. Stepwise regression to identify factors (elevation, mean annual precipitation, mean annual temperature, standardized precipitation-evapotranspiration index, and wood density) determining the annual mortality rate during droughts.
M, annual mortality rate during droughts; E, elevation; P, mean annual precipitation; T, mean annual temperature; S, standardized precipitation-evapotranspiration index; W, wood density.
| Tree group/type | Equation | R2 | P | n |
|---|---|---|---|---|
| Angiosperm | M = 0.002E-0.001P-2.455S-6.233W+7.5 | 0.608 | 0.000 | 106 |
| Gymnosperm | M = -0.002E-0.003P-6.994S-0.109T-28.097W+18.4 | 0.592 | 0.000 | 104 |
| Evergreen | M = -0.001E-0.003P-4.436S-10.052W+11.3 | 0.508 | 0.000 | 160 |
| Deciduous | M = 0.003E+3.6 | 0.452 | 0.000 | 40 |
| All | M = -0.001E-0.002P-4.773S-8.575W+9.1 | 0.471 | 0.000 | 214 |