Fig. 3. Differences in ¹³C values () in samples before extraction and chemical residues between the oak and pine lysimeters with LIT = litter, FL = floatables (50–2000 µm), FS = fine silt (2–5 µm), and CL = clay (<2 µm). Note that all fractions for the pine were more ¹³C enriched than that for the oak, as represented by positive values on the graph. *indicates significance between vegetation types at p = 0.05, **at p = 0.01, and ***at p = 0.001. Error bars represent standard errors.