Toxic effects of combined accumulation of heavy metals (Pb, Cdand Cu) on rice

摘要

Metals have strong influence on development and growth of rice. To simulate how rice is affected and accumulation from heavy metal contamination under combined condition by field experiment was conducted with rice at control (no pollution) and other five concentration gradient treatments of lead (Pb), cadmium (Cd) and copper (Cu) were set-up in a completely randomized design with three replications. Dry weight and yield were measured and monitored heavy metals accumulation in rice tissues at each growth period of rice. The results revealed that the growth and development of rice plants were strongly influenced under combined pollution. Root was more sensitive to soil Pb, Cd and Cu toxicity than other parts of rice plant. The rice grains Pb and Cd concentrations separately exceed the recommended safe limit (0.2 and 0.1 mg/kg), except the treatment Pb_(100)Cd_(03)Cu_(50), which means that rice grown in combined pollution soils poses more risk to human health.