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Fig. 6. Potassium chloride-extractable and microbial biomass ${delta}$ ¹⁵N values measured before the isotopic tracer addition (18 Feb. 2004), during snowmelt (4 Mar. 2004), and in midsummer (12 July 2004). Different lowercase letters indicate significant differences in KCl-extractable ${delta}$ ¹⁵N and microbial biomass ${delta}$ ¹⁵N among the three sampling dates ( ${alpha}$ = 0.05). Error bars indicate the standard error of the group means.