Abstract:Mechanisms for Al uptake and accumulation in Al-excluders and Al-hyperaccumulators namely Camellia sinensis, Melastoma affine, Sterculia lanceolata, Ardisia crenata, Acacia formosa and Machilus thunbergii were investigated in the natural ecosystem of a tea plantation in Hong Kong. The pH values of the fresh stems and roots of 6 plant species varied from 3 to 6 and total Al concentrations in different parts of the 6 plant species ranged from 13~12810 mg/kg. It is apparent that pH of fresh plant tissues was t...