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Qualitative PCA of 16S rRNA gene sequences during decomposition of rye litter (open symbols) and wheat straw (solid symbols) on day 0 (○ and •), day 18 (▵ and ▴), day 58 (▿ and ▾), day 118 (⋄ and ♦), and day 180 (□ and ▪) (X = 19.3%; Y = 16.9%; Z = 14.2%; Σ = 50.4%).
