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Fig. 4 | Annals of Forest Science

Fig. 4

From: Changes in tree-ring wood density of European beech (Fagus sylvatica L.), silver fir (Abies alba Mill.), and Norway spruce (Picea abies (L.) H. Karst.) in European mountain forests between 1901 and 2016

Fig. 4

6-month SPEI for August in the periods 1901–2016 in the study sites (smoothed lines are based on a span factor equal to 0.1). The dots, coloured according to the site, correspond to severe (i.e., 6-month SPEI for August equal to or below -1.28, dashed light blue line) and extreme drought (i.e., 6-month SPEI for August equal to or below -2.06, dashed dark blue line)

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Annals of Forest Science

ISSN: 1297-966X