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Fig. S1 Climatic anomalies 2007–2010.

Fig. S2 Yields of sugar extractions (mg C per 2 cm core) using two different methods.

Fig. S3 Composition of total nonstructural carbohydrate (NSC) pool.

Fig. S4 Differences in mean stemwood concentrations of nonstructural carbohydrates between ‘dead’ and ‘healthy’ paper birch trees at Bartlett Experimental Forest.

Table S1 Seasonal variability in nonstructural carbohydrates (NSCs).

Notes S1 Comparison of sugar yields from two different extractions.

Notes S2 Nonstructural carbohydrate (NSC) dynamics in declining and dead trees.