Effect of heavy metals on growth and metal accumulation of an energy crop, Pennisetum purpureum schum

摘要

An experiment was conducted to evaluate the effect of Cu, Cd, Ni, As, Zn, Pb on growth, and metal accumulation of an energy crop, Pennisetum purpureum Schum. The dry weight was significantly decreased under the heavy metal pollution, while the shoot length was not suppressed significantly in the treatments of Cu, As, Pb. The concentration of Cu, Cd, Ni, As, Zn, Pb in plant shoot were 4.7~10.43, 5.37~11.07, 59.53, 0.08~9.33, 20.73~310.62,37.77~194.94 mg/kg, respectively. The BCF of P. purpureum in all treatments were all lower than 1. P. purpureum could produce 15.35-24.03 t/ha of dry biomass under Cu, As, Pb pollution each year. The study results indicated that P. purpureum could be cultivated as an energy crop in Cu, As, Pb -contaminated soils and might be useful for the phytostabilization of this pollution soil.