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Kruskal–Wallis H-test bar plot of genera with a high relative abundance and statistically significant differences. *P ≤ 0.05, **P ≤ 0.01. Wild Danxia rock, WDR; large Danxia stone, LDS (>20 cm × 20 cm, greenhouse); broken Danxia stone, BDS (<2 cm × 2 cm, greenhouse); broken coarse sandstone, BCSS (<2 cm × 2 cm, greenhouse); and wood spile, WS (greenhouse).
