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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)

From: Quantifying the effect of persistent dryer climates on forest productivity and implications for forest planning: a case study in northern Germany

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