Table 5 Definition of risk classes on drought stress based on water available to plants in the growing season for Norway spruce, European beech, sessile and pedunculate oak and Douglas-fir and Scots pine
| Drought stress | Water available to plants in growing season (mm) | |||
|---|---|---|---|---|
| Spruce | Beech | Oak/Douglas-fir | Pine | |
| Low | >0 | > –25 | > –150 | > –180 |
| Medium | 0 to –80 | −25 to –100 | −150 to –400 | −180 to –450 |
| High | < –80 | < –100 | < –400 | < –450 |