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Qualitative PCA of 16S rRNA gene sequences during rye litter decomposition (A, X = 29.8%; Y = 25.2%; Z = 14.0%; Σ = 69.1%) and wheat litter decomposition (B, X = 36.2%; Y = 18.8%; Z = 15.5%; Σ = 70.5%). Symbols: •, day 0; ▴, day 18; ▾, day 58; ♦, day 118; ▪, day 180.
