Figure 6: (A) Depth (Cm) vs. 40K Activity (Bq Cm−1) and (B) Depth (Cm) vs. 226Ra Activity (Bq Cm−1) in Average Soil Profiles From the Ambient (Open Circles) and Elevated-Co2 (Filled Circles) Plots at the Oak Ridge FACE Site.

doi 10.7717/peerj.5356/fig-6