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. 2015 Feb 2;6:31. doi: 10.3389/fmicb.2015.00031

Figure 3.

Figure 3

Variations of soil microbial diversity along the copper gradients in both years of the fluvo-aquic soil (A), and red soil (B). The dark blue y-axis indicates the Gini coefficient. The red and black y-axes indicates the OTU numbers and Shannon index, respectively. Error bars represent standard errors (n = 4).