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PCA scores (A) and loadings (B) for relative 13C incorporation of added 13C-labeled glucose, acetic acid, glycine, starch, or vanillin in NLFA of tundra heath soil following incubation for 1 (white symbols) or 7 (black symbols) days. Explained variances for the PCs 1 and 2 are shown in parentheses. Values in panel A are means ± standard errors (n = 6).
