Arsenic response in roots of Eucalyptus spp.

Studies of As bioavailability showed variation in availability of As, ranging from 0.5 to 1.2 mg/Lin rhizosphere-tailings, compare to tailings ranging from 0.4 to 0.5 mg/L. In hydroponic studies, As exposed plants (1 mg/L) showed variation in reduction of approximately 50% in relative growth rate and differences in biomass allocation compared to control plants. E. camaldulensis grew about twice as fast as E. cladocalyx and E. camaldulensis allocated about twice as much biomass belowground (roots) as E. cladocalyx (Fig. 1).