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Variation in the concentrations of B. ermanii stems (a) soluble sugar, (c) starch and (e) NSC as well as P. jezoensis stems (b) soluble sugar, (d) starch and (f) NSC (mean ± SD; % of dry matter) along with elevational gradients in Changbai Mountain (n = 5 for each elevational site). Different letters indicate significant differences (p < 0.05) among elevations as determined by Tukey’s HSD test single-factor ANOVAs.
