Table 2.
Environmental predictors at the 1,075 study plots across Switzerland
| Category | Name | Class | Description | Min | Q 0.25 | Med | Q 0.75 | Max | Unit |
|---|---|---|---|---|---|---|---|---|---|
| Climate | DD | Temperature | Mean yearly degree‐days >5.56°C (1981–2010) | 575 | 1,318 | 1,743 | 2,025 | 2,870 | °C |
| T‐Cont | Temperature | Mean temperature amplitude January/July (1981–2010) | 14.6 | 17.1 | 18.0 | 18.4 | 20.5 | °C | |
| RR | Water | Mean precipitation June to August (1981–2010) | 151 | 342 | 414 | 510 | 792 | mm | |
| RH | Water | Mean relative air humidity June to August (1981–2010) | 63.7 | 71.8 | 73.0 | 74.3 | 80.9 | % | |
| Soil | AT/PT | Water | Drought index; mean ratio between actual and potential transpiration June to August (1981–2010) | 0.23 | 0.94 | 0.99 | 1.00 | 1.00 | — |
| C/N | Nutrients | Mean C/N ratio (Corg/Ntot) in 0–10 cm soil depth | 7.5 | 14.5 | 16.9 | 20.1 | 42.5 | — | |
| BS | Nutrients | Mean base saturation in 0–50 cm soil depth | 2.7 | 18.5 | 85.9 | 99.6 | 100.0 | % | |
| W‐level | Soil aeration | Mean depth of the soil water level in the vegetation period | 20 | 200 | 200 | 200 | 200 | cm |