Fig. 2. Effect of soil moisture content on the composition of the soil solution of a saline Vertisol (V-S, left), a saline gypsiferous Vertisol (V-SG, middle), and a gypsiferous Vertisol (V-G, right). The dotted lines without data represent the expected ionic strength that would result from a decrease in moisture content without any interaction with the soil solid phase. The vertical bars represent the standard deviations from the mean of four replicates.