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Taxonomic, functional, and phylogenetic diversity of herbaceous plants versus time at 80 grassland study sites on contrasting soils (38 serpentine, 42 nonserpentine). Time and time–soil interaction are significant for taxonomic diversity (P < 0.0001 for year and year × soil) and phylogenetic diversity (P < 0.0001 for year, P = 0.035 for year × soil); only time is significant for functional diversity (P = 0.037).
