Fig. 3From: The inhibitory effect of cadmium and/or mercury on soil enzyme activity, basal respiration, and microbial community structure in coal mine–affected agricultural soilShannon diversity index and observed species of bacterial communities and fungal communities in soils. The valid bacterial and fungal sequences were normalized to 4513 for each sample. The error bars show the standard error of three subsamples for each soil sample. Different letters indicate significant differences (P < 0.05, Duncan)Back to article page