Table 2 Definition of drought vulnerability classes for five major tree species (* Pedunculate and sessile oak) according to Spellmann et al. (2007, Spellmann et al. 2015)
Drought Vulnerability | Site water budget in growing season (mm) | |||
|---|---|---|---|---|
Norway spruce | European beech | oak* / Douglas-fir | Scots pine | |
Low | > 0 | > –25 | > –150 | > –180 |
Medium | 0 to –80 | –25 to –100 | –150 to –400 | –180 to –450 |
High | < –80 | < –100 | < –400 | < –450 |