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(a) Above-ground plant biomass (open bars) and root density (shaded bars) and (b) soil respiration rates in June (open bars) and August (shaded bars) in mesocosm plant communities (±s.e.m.). f, forb; s, sedge and g, grass and the numbers refer to the number of species represented. Bars sharing a letter are not significantly different (p>0.05). Each data series is interpreted independently.
