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Fig. 1 | Annals of Forest Science

Fig. 1

From: Interannual radial growth response of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) to severe droughts: an analysis along a gradient of soil properties and rooting characteristics

Fig. 1

a De Martonne aridity index and soil moisture index (SMI) for the region of the study sites calculated from May to August in each year. They indicate severe drought years. b Mean raw tree ring width chronologies of Douglas-fir (DF) and Norway spruce (NS), classified according to the main soil texture. Vertical gray lines mark the severe drought years 2003, 2004, and 2018

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Annals of Forest Science

ISSN: 1297-966X