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Table S1 Regression model for δ15N in soil profiles in May 2003 in FACE plots (natural abundance, before 15N additions) and in 2010

Table S2 Average nitrogen concentration and δ15N values for sporocarp taxa sampled in 2004 from outside plots (natural abundance)

Table S3 Paired t-tests in the Oea and 0–15 cm horizons for DON, microbial biomass, and roots

Table S4 Regression model of δ15N values for saprotrophic and ectomycorrhizal fungi in ambient and elevated CO2 treatments in 2004

nph12578-sup-0002-TableS5.docxWord document33KTable S5 Studies of depth distribution of ectomycorrhizal fungal taxa