FIG 2.

(A) PCA showing the distribution of soil microcosms in a reduced space defined by the relative abundances of the 93 genome bins. Land use types are represented by the following symbols: squares, farmland; circles, larch; triangles, poplar. Black symbols indicate soil microcosms exposed to eH₂ treatment, and white symbols indicate soil microcosms exposed to aH₂ treatment. (B) Relative abundances of the four genome bins outlined by the PCA. Asterisks denote genome bins whose relative abundance was significantly different (Wilcoxon-Mann-Whitney test) between treatments. The term n.s. represents nonsignificant relationships. CPM, counts per million.