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Drought and root type effects on root biomass in experiment 1, which consisted of mixed taxonomy. Vertical allocation of the total root biomass (a–c) and proportions of root biomass (d–f) for three drought treatments in 5 cm increments. CONT was well watered pots; TOP refers to water applied at the top of the pot, BOTTOM to water applied to the bottom, both of which were maintained at 25% WHC
