图4. 铬(Cr)胁迫时间序列上谷子根际土壤细菌和真菌群落门水平与属水平群落结构及群落间差异。A、B, 细菌和真菌Venn图。图中的数字代表的是不同分组中分类操作单元的个数。C、D, 细菌和真菌门水平群落组成。E、F, 细菌和真菌属水平群落组成。CK, 对照; Cr_6d, Cr胁迫6 d; Cr_6h, Cr胁迫6 h。不同小写字母表示各处理间差异显著(p < 0.05)。

Fig. 4. Community structure and inter-community differences between bacterial and fungal communities in the rhizosphere soil of Setaria italica at phylum level and genus level in the chromium (Cr) stress time series. A, B, Bacterial and fungal Venn diagrams. Numbers in these figures represent the number of operational taxonomic units in different groups. C, D, Bacterial and fungal phylum-level community composition. E, F, Bacterial and fungal genus-level community composition. CK, control; Cr_6d, Cr stress for 6 d ; Cr_6h, Cr stress for 6 h. Different lowercase letters indicate significant differences among treatments (p < 0.05).