790795.fig.003a
(a)
790795.fig.003b
(b)
790795.fig.003c
(c)
790795.fig.003d
(d)
790795.fig.003e
(e)
790795.fig.003f
(f)
790795.fig.003g
(g)
Figure 3: Spatial distributions of the Cu and Zn extracted by DTPA and CaCl2 in natural and acidified samples and the total content of Cu and Zn in natural soil samples. (a) and (c) Cu and Zn extracted by DTPA in natural samples; (b) and (d) Cu and Zn extracted by DTPA in acidified soil samples; (e) and (f) total content of Cu and Zn in soil; (g) Cu extracted by CaCl2 in natural samples.