Fig. 5
From: Rare earth element geochemistry in soils along arid and semiarid grasslands in northern China
Upper continental crust normalized patterns of carbonate-bound REE, reducible REE, oxidizable REE, and residue REE in soil depth profiles (0–10, 10–20, 20–40, 40–60 and 60–100 cm) at selected sites. a S03, aridity index (AI) = 0.03, b S09, AI = 0.10, c S13, AI = 0.22, d S19, AI = 0.51