Fig. 4From: High-throughput sequencing technology reveals that continuous cropping of American ginseng results in changes in the microbial community in arable soilChanges of Chao 1 (a), observed species (b), phylogenetic diversity (c), and Shannon index (d) for the 18S rRNA gene sequences from soils used for traditional crops and American ginseng. TF and AGF refer to soil samples from traditional farmland and American ginseng farmland, respectively. An asterisk denotes a significant difference between TF and AGF at P < 0.05. The value of each bar represents the mean ± SD of n = 3Back to article page